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"De-Mystifying" Theoretical Physics
I am not a professional physicist. I am nothing but an enthusiastic amateur. Neither am I a professional mathematician. I would rate my level of mathematical knowledge as probably just above A-Level standard. So I am unable to manipulate the tensors of String Theory, and I am also unable to completely understand the technical details behind most Quantum Physics experiments. But I believe that my lack of formal knowledge may have actually helped me to uncover certain valid identifications of semantic and philosophical errors in Theoretical Physics which many esteemed professionals either seem to deliberately ignore or not consider as important. I, however, feel that identifying and explaining these semantic and philosophical errors is extremely important. My identifications are not "earth shattering". They don't contain anything which is not already totally obvious to any professional physicist. So I don't believe for one second that any explanations I write here will help any professional physicists with their actual research or anything like that. My ego is not that big! But I do believe that these explanations may help (some) professional physicists when they write their "popular science" books and attempt to "de-mystify" Theoretical Physics for the general public. I have come to the conclusion that some of the explanations I have read in "popular science" books do not actually "explain" anything at all. And I have also read some attempts at "de-mystification" which have actually left me feeling more "mystified" than I was in the first place! We may not know exactly how the "Universe" works, but most of us know how "politics" works. Politicians want to stay in Office, and to do this they must gain public support. It is not in the politicians' own self interest to give research grant money to something which the general public feels "alienated" from. This is obviously why Theoretical Physics must be made more accessible and interesting to the general public. And explanations written by top scientists which do not actually "explain" anything are not really helping matters. I, and thousands of other enthusiasts, would love to see a "Supercollider" built with an energy capacity which may be capable of proving the existence of the "Higgs Boson" or something similar. So my "de-mystifying" identifications and explanations are my, unfortunately miniscule, contributions to the cause. The first thing I would like to address is the way the "mystery" which physicists call "The Arrow of Time" is treated in most popular science books. In their "Arrow of Time" discussions, many esteemed physicists pose the question of: "Why does time always flow forwards?" Or, stated another way: "Why does time never flow backwards?" And they then go on to attempt to answer these questions by talking about thermodynamics and entropy etc. I will show that even asking these questions is semantically and philosophically incorrect. And I will also show that their thermodynamic/entropic explanations are actually attempting to answer a completely different (but semantically valid) question. Furthermore, I will give a totally complete and correct answer to the semantically and philosophically ridiculous question of "Why does time never flow backwards?" in just one short sentence. There is no need for a whole chapter of a book to answer this question; one short sentence is completely sufficient. But I have never read this "one sentence explanation" in any popular science book, and I really don't know why it is not used in ALL physics related popular science books! In order for the "Arrow of Time mystery" to become totally non-mysterious, we first need to understand what time actually is. Some esteemed physicists do not seem to fully understand a principle called "The Map is not the Territory". Time appears in their equations along with other variables like mass etc which actually exist in reality; and because of this, they seem to see time as a real facet of existence (like mass etc). And, consequently, they seem to think that they can use time to explain things in the same way as they would use other real facets of existence (like mass etc) to explain things. This is the problem! It isn't, so they can't! And if they do, their explanations are worthless because they are not actually "explaining" anything at all! I have actually read a book in which an esteemed physicist attempted to answer the "Why does time never flow backwards?" question by referring to a thermodynamic equation (in which "time" was one of the variables) as part of his explanation. This is patently ridiculous. You can't explain the properties of a "something" by using that same "something" as part of the explanation. Even if the "something" is actually real, you are not actually explaining anything at all if you do that. And what makes this physicist's "explanation" even more ridiculous is the fact that he was using an equation which exhibits "time-reversal symmetry" (as do all these type of equations) in an attempt to show why "time never flows backwards"! What this physicist was actually attempting to do was to answer this completely different (but semantically valid) question, as I mentioned earlier. I cannot believe that he didn't seem to realise that this was what he was actually doing! So I can only assume that he was deliberately ignoring it, or didn't feel that it was important. Anyway, the point I am making is that this "non-explanation" didn't help the general reader at all. Even the great Albert Einstein made a subtle variation of this same fundamental philosophical "error" in his theories of special and general relativity. And this error caused Einstein (and everyone else) to draw inferences about the "structure of reality" which are actually totally opposite to the inferences they could have drawn if this fundamental error had not been made. I will fully explain Einstein's fundamental philosophical "error" shortly. But, as I said earlier, in order to understand "The Arrow of Time" and Einstein's fundamental philosophical error, you will first need to be armed with a complete understanding of what time actually is. So, here we go! What actually is time? This is an "official" definition of time: "Time is a dimension that enables two otherwise identical events that occur at the same point in space to be distinguished. -- A Dictionary of Physics (ISBN: 0-19-280030-2)" I believe that calling time a "dimension" is seriously misleading to the general public. To include time as a dimension along with the other three dimensions of height, width and depth to make four dimensional "space-time" creates a major area of "misunderstanding" for the general public. It allows people to believe that they can treat the "dimension" of "time" in the same way as they can treat the other three dimensions. And, therefore, it allows people to ask totally illogical questions like: "Why does time never run backwards? etc. Most people do not realise that four dimensional "space-time" is nothing but a "mathematical model" which happens to be extremely good at predicting the results of various experiments. In fact, Einstein's equations were so successful at predicting the results of experiments that people started believing that these "mathematical models" actually WERE REALITY and not just representations of reality. But, however accurate at predicting "reality" Einstein's equations are, they are NOT actually REALITY. They are nothing but mathematical REPRESENTATIONS OF REALITY which happen to be able to predict ACTUAL REALITY extremely well. To confuse a "representation of reality" with "actual reality" is to fail to understand a principle called "The Map is not the Territory". I believe that "The Map is not the Territory" type of misunderstanding is very common among the general public. And even some esteemed physicists seem to fall victim to it on the odd occasion. Anyway, back to my question: What actually is time? Here are some "semantically and philosophically correct" definitions/descriptions of what time actually is: Unlike other "things" like mass etc, time does not actually exist. Time is definitely not a "dimension" in the same sense as the other three "dimensions" of height, width and depth. In fact, time is nothing but a totally man-invented "concept", and it has no "real" existence in the fabric of the universe whatsoever. Time is nothing but a "concept" which we human beings (unconsciously) invented in order to make "changing patterns of existence" intelligible and quantifiable to us. Or, stated in another way, "Time IS changing patterns of existence". To talk about time outside of the context of existence (or more correctly: "changing patterns of existence") would be completely nonsensical and totally invalid. In the last paragraph, I gave a precise definition/description of time. But this precise definition of time does not provide a complete "explanation" of what time actually is, nor does it give any real indication of what valid conclusions can be drawn from it. So, because it is essential to completely understand exactly what time actually is in order to proceed further, I will now spend some time giving a few examples and "scenarios" etc. Hopefully, by the end of this next section, the exact nature of time will be so familiar to you that it will just become "second nature" to think about time in this "new" way. First of all, it's important to completely understand the answer to this question: "How do we actually measure time?" The short answer is that the only possible way we can measure time is by counting (and sometimes comparing) "changing patterns of existence". And the more similar these "changing patterns of existence" are to each other, the more "accurate" our "measure of time" will be. A good example of this is a grandfather clock. Some very handy laws of nature have decreed that, whether a pendulum is swinging quickly or slowly, each swing of that pendulum will take the same amount of "time". This is (basically, but not exactly) how a Grandfather clock works. Each swing of the pendulum moves a cogwheel one notch, and this is translated by others cogs etc to the movements of the hands on the clock face. So basically we are counting "changing patterns of existence" by using a cogwheel to count each swing of the pendulum. And because these "changing patterns of existence" are similar, our "measure of time" will be "accurate". You could argue a semantic point here with me by saying that "You are not measuring a "CHANGING pattern of existence" because the "duration" of the pendulum's swing IS ALWAYS THE SAME". But this is not what I mean by "changing patterns of existence". I mean that the "actual pattern of existence" is changing. For example: If you were to make a video recording of your grandfather clock's swinging pendulum, and then play it back frame by frame; you would see the pendulum in a slightly different position in each frame. Each frame would show you a slightly different "pattern of existence" which had changed from the previous one. And even if you were to compare different frames which showed the pendulum to be in exactly the same position, that would only confirm to you that the "pattern of existence" was repeating. You could easily confirm that the actual "pattern of existence" was really changing by looking at the frames before and after the frame you were originally looking at. Just because a "pattern of existence" is repeating, it does not mean that it isn't changing. In fact, if a "pattern of existence" is repeating, it actually proves that it IS changing. It has to change to a different "pattern" in order to be able to repeat its previous "pattern". If it didn't change, it wouldn't be repeating. It would just be staying the same. Now that we have established that a repeating "pattern of existence" must also be a "changing pattern of existence", we can further clarify things by using the "video recording the pendulum" example to conclusively prove that the process of measuring time is absolutely nothing more than counting (and sometimes comparing) "changing patterns of existence". It is totally obvious by now that the more similar to each other these "changing patterns of existence" are, (for example, the pendulum's repeating swing), the more "accurate" your "measure of time" will be. So I will not mention this again, as it is not really an important factor in understanding what time actually is anyway. Let's say that we wanted to verify that a certain pendulum's swing will always take the same amount of "time" whatever "speed" that pendulum is actually moving at, and whatever distance its swing actually covers. We could easily do this by adjusting the "frame counter" on your video camera so that it adds a consecutive number to each frame that it records. Then we could start the pendulum swinging, and film the pendulum until it stops swinging. We could then choose which side of the swing we wanted to measure it from, right hand side or left hand side; it doesn't matter. But for example let's say we chose the right hand side. Then we could locate all the frames in your video recording where it shows the pendulum at the extreme right hand side of its swing. Then we could "count" the number of frames between each of these extreme right hand side positions. Any we would find that, whatever distance the extreme right hand side of the swing was from the position where the pendulum is vertical, the number of frames between all the extreme right hand side positions would always be equal. So we have now verified that the "time" of that pendulum's swing is always the same, whatever "speed" or distance it actually swings. (If there are any Ph.D. physicists reading this, please be aware that I know that this is not "absolutely" correct and foolproof, partly because we are not measuring the swing using its vertical as a standard. I am simply using it as a basic example to illustrate something that I will mention shortly). Anyway, furthermore, because we have read the instruction manual and we know how many frames our video camera can film "per second", we can now also measure the actual "time" it took for each swing as well as verifying that the "duration" of the swings were all equal. (Are you now thinking: "Why is he stating the blindingly obvious?" If you are, hopefully it will become clear why I am doing it very shortly). Now, let's have a look at what we have actually done. What have we actually measured, and how have we actually measured it? First of all, by "counting" and "comparing" the difference between certain frames, we verified that the "changing pattern of existence" which we are calling "the pendulum's swing" has a certain constant and repeatable aspect. Then, by adding a "frame counter" to our video recording and knowing how many frames we recorded "per second", we came up with a value for this repeatable aspect which we call "time". So, now, we have used this value which we call "time" to "quantify" the "duration" of the pendulum's swing. So, how have we measured this "time"? All we have actually done is counted certain "changing patterns of existence" and compared them with other "changing patterns of existence". i.e. One "changing pattern of existence" was the pendulum's swing and the other "changing pattern of existence" was the film running through our video camera. And by doing this, we have ended up with a "numerical value" which we call "time". Remember this: all we have ended up with is a "NUMERICAL VALUE". So, where is this "dimension" called "time" that I read about in the "official" definition? It isn't actually anywhere, is it? If a simple "numerical value" which is obtained by counting and comparing a couple of changing patterns is a "dimension", then we may as well call ANYTHING a "dimension"! For example: I could count the different number of ways that I can arrange the row of letters XYZ and derive a numerical value of "six different ways" for an answer. Is the number "six" now a "dimension"? I have counted six "patterns of existence" here, so why isn't the number "six" a "dimension" as well? I think it's obvious what I'm trying to say here. It's this: we really need a more precise definition of what a "dimension" actually is! I will re-state some "semantically and philosophically correct" definitions/descriptions of "time" he Unlike other "things" like mass etc, time does not actually exist. Time is definitely not a "dimension" in the same sense as the other three "dimensions" of height, width and breadth. In fact, time is nothing but a totally man-invented "concept", and it has no "real" existence in the fabric of the universe whatsoever. Time is nothing but a "concept" which we human beings (unconsciously) invented in order to make "changing patterns of existence" intelligible and quantifiable to us. Or, stated in another way, "Time IS changing patterns of existence". To talk about time outside of the context of existence (or more correctly: "changing patterns of existence") would be completely nonsensical and totally invalid. Can you see now why this definitions/descriptions are correct, and the "official" definition is misleading? If not, you will probably see it after this next example. But, before this next example, I think it would be useful to state how a standard period of time is actually defined. Here it is: "One SI Second (atomic second) is the interval of "time" taken to complete 9,192,631,770 oscillations of the Caesium 133 atom exposed to a suitable excitation". In other words: We "count" the oscillations of the "changing pattern of existence" which we call "the exited Caesium 133 atom" until we arrive at a "numerical value" of 9,192,631,770. Then, we say that this "period of time" is equal to "one second". Well, this is the "official" definition of "one second of time". I can't see any "dimensions" here, can you"? Personally, I can only see some changing patterns which are repeating, some counting and a numerical value. Can you see now that the "flow" of time does not exist anywhere other than inside our own minds? Consider this example. Let's imagine a universe that was completely static and unchanging. This universe would contain no "time". Now, let's imagine that you invented a spaceship with a "stringbuster" drive which allowed you to "jump" out of our universe and visit this static and unchanging universe. Well, as soon as you arrived in this new universe, this new universe now definitely WOULD contain time. And as you observed its strange static and unchanging ways from the safety of your spaceship, you would experience the "flow of time" in exactly the same way as you would in our own universe. Why is this? It is because you brought your own "time" with you when you arrived there! The only reason we experience this "flow of time" is because we all carry our own "biological clocks" with us inside our own brains. Inside our brains, there are numerous "biological mechanisms" at work which are comparing certain "changing patterns of existence" which occur in our bodies with other "changing patterns of existence" which occur in our bodies. And the workings of these various "biological mechanisms" are responsible for giving us the "feeling" which we experience as "the flow of time". And that's all it is: a feeling! Time is nothing but "changing patterns of existence". The "flow of time" only actually exists as a biologically created "feeling" inside our own brains. Time, as a real "entity", DOES NOT ACTUALLY EXIST. Once again, here are some "semantically and philosophically correct" definitions/descriptions of what time actually is: Unlike other "things" like mass etc, time does not actually exist. Time is definitely not a "dimension" in the same sense as the other three "dimensions" of height, width and breadth. In fact, time is nothing but a totally man-invented "concept", and it has no "real" existence in the fabric of the universe whatsoever. Time is nothing but a "concept" which we human beings (unconsciously) invented in order to make "changing patterns of existence" intelligible and quantifiable to us. Or, stated in another way, "Time IS changing patterns of existence". To talk about time outside of the context of existence (or more correctly: "changing patterns of existence") would be completely nonsensical and totally invalid. So, at last, we arrive at the semantically and philosophically correct answer to the question: "Why does time never flow backwards?" This is the answer: "Time never flows backwards (or forwards, or anywhere) because TIME DOESN'T ACTUALLY EXIST!" (Obviously, something that doesn't even exist can't flow anywhere or do anything!) The actual (semantically valid) question that is really being asked by the "Why does time never flow backwards?" question would be something like this: "Why don't all the "patterns of existence" which have changed just "undo" themselves and sequentially revert back through the state changes they have undergone?" This is the REAL question that the physicists are actually trying to answer with their thermodynamic/entropic "explanations" and equations. But, even then, some of these physicists do not seem to understand (or seem to deliberately ignore) the fact that a mathematical equation does not actually "explain" anything! This is a good example of not realising (or deliberately ignoring) the fact that THE MAP IS NOT THE TERRITORY. Anyway, on to Einstein and his four-dimensional "space-time" etc. Because of Einstein's equations, it is frequently stated that: "Time slows down when under the influence of acceleration or a gravitational field". Well, we have just established that "time" doesn't actually exist. So time can't actually "slow down" or "speed up" or do anything really. Therefore the statement "Time slows down when under the influence of acceleration or a gravitational field" is obviously semantically and philosophically incorrect. What actually happens is that: EXISTENCE "slows down" under the influence of acceleration or a gravitational field. In other words, "changing patterns of existence" do not change as "quickly" under the influence of acceleration or a gravitational field as they would if the acceleration or gravitational field was not present. Or, to give a specific example: A suitably excited Caesium 133 atom would take "longer" to complete 9,192,631,770 oscillations under the influence of acceleration or a gravitational field than it would take to complete 9,192,631,770 oscillations if it wasn't under the influence of acceleration or a gravitational field. In fact, atomic clocks have been used to "prove" the semantically incorrect assertion that "time slows down" under the influence of acceleration or a gravitational field. Various people have been given "portable" atomic clocks and then sent either into space or on very fast accelerating aeroplanes etc. Then, when these people return from their "acceleration trips", their atomic clocks are compared with other atomic clocks which have not undergone these "accelerations". And, upon comparison, it is always found that the atomic clocks which have undergone "acceleration" have recorded a "shorter" period of "time" than the atomic clocks which did not undergo "acceleration". Then, it is said that the people who carried the atomic clocks on the aeroplanes are a few microseconds "younger" than the people who stayed on the ground etc. Well, that's as may be. But nothing about "time" has actually been explained by these "measurements", has it? There are a few different types of "atomic clock". But, for the purposes if illustration, let's imagine that the type of atomic clock used in these "time slowing down" experiments were the "Caesium 133" type that I mentioned earlier. Well, again, we established earlier that "time" doesn't actually exist. So it is not "time slowing down" that is making the "accelerated" atomic clocks record a shorter period of "time" than the "non-accelerated" atomic clocks. The only way that something which does not actually exist can affect something is for it to be "conceptualised" by the brain of an animal, and then acted upon by that animal. Like me writing this last paragraph, for instance. Anyway, something is "slowing down" and making the "accelerated" atomic clocks record a "shorter" period of "time" than the "non-accelerated" atomic clocks. So, if it's not "time" itself slowing down", then what is it? It is actually "changing patterns of existence" which are "slowing down". All the "patterns of existence" which are under the influence of "acceleration" will change at a rate which is "slower" than the rate they would change at if they were not under the influence of "acceleration". Including the "changing patterns of existence" which we refer to as "oscillating Caesium 133 atoms" in our "accelerated" atomic clocks! i.e. A suitably excited Caesium 133 atom will not oscillate as "quickly" under the influence of "acceleration" as it would oscillate if it was not under the influence of "acceleration". The reason that the "accelerated" atomic clocks record a "shorter" period of "time" than the "non-accelerated" atomic clocks is because the oscillating Caesium 133 atoms in the "accelerated" atomic clocks have not "oscillated" as many times as the oscillating Caesium 133 atoms in the "non-accelerated" atomic clocks. And because 9,192,631,770 oscillations of the Caesium 133 atom is recorded by the atomic clocks as "one second", it is obvious that it is going to take "longer" to record "one second" on the "accelerated" atomic clocks than it is going to take to record "one second" on the "non-accelerated" atomic clocks. Therefore, when the "accelerated" and "non-accelerated" atomic clocks are compared, the "accelerated" atomic clocks are obviously going to register that a "shorter" period of "time" has elapsed than the "non-accelerated" atomic clocks. i.e. Less "oscillations" = less "time" recorded. So where are we now? We have established that "time" doesn't actually exist in reality and, because of this, we have also been able to correct a few semantically "dodgy" questions and statements which were misleading in their previous forms. We have established that "time" is nothing but "changing patterns of existence". And we have also established that the "measurement" of "time" is actually nothing but "counting" and "comparing" certain "changing patterns of existence" with other "changing patterns of existence" in order to arrive at a simple "numerical value". Then, with these "understandings" under our belt, it became obvious that it was "existence itself" that "slows down" under the influence of acceleration or a gravitational field - not "time". But this last observation leads us logically on to another observation. i.e. SOMETHING must be causing "patterns of existence" to change more "slowly" when they are under the influence of acceleration or a gravitational field. And this SOMETHING leads us on to the subject of Einstein's fundamental "error", which I mentioned earlier. Albert Einstein's "mathematical models" which describe something known as "space-time" are extremely successful at predicting the results of various "experiments". And, incidentally, so is something called "The Standard Model". "The Standard Model" is excellent at predicting the probabilities and results of various Quantum Mechanical type experiments, even though it contains about a dozen completely "made up out of thin air" terms or "constants" which are necessary to make the equations work at all. However, Einstein's "space-time" representation of the universe only seems to contain approximately ONE "dodgy" aspect. But, unfortunately, this "dodgy" aspect is "time". Before Einstein formulated his equations, it was generally assumed that some kind of "carrier medium" was necessary in order to explain the "wave like" ways that light seemed to propagate in. This was quite logical; because in order for a "wave" to propagate, it seemed obviously necessary to have something to actually "wave". For example: it would be extremely difficult to throw a pebble into a pond and make some waves if the pond in question didn't actually contain any water! The Michelson/Morley experiment was one famous attempt to detect this "carrier medium" or "luminiferous aether" as it was then called. The details of the experiment as not important here but, basically, they weren't able to detect anything. There are actually some modern physicists who have identified some problems with some technical aspects of the experiment, but that is not relevant here either. What is relevant is that Einstein's "mathematical models" gave a way to accurately predict the behaviour of light etc, without the need to incorporate any kind of "carrier medium" or "luminiferous aether" into the "workings". So, the presence of any kind of "carrier medium" or "luminiferous aether" was now superfluous in "explaining" the properties of light etc. Anyway, the "luminiferous aether" idea went out of favour after Einstein wrote his "equations". I believe that this was very unfortunate, and it was partly due to a fundamental non-mathematical philosophical "error" that Einstein made. I say that it was "unfortunate" because I will now show that Einstein's "relativity theories" actually SUPPORT the existence of some kind of "carrier medium" when this fundamental non-mathematical philosophical "error" is corrected. This "error" revolves around the logically and philosophically incorrect use of "time". I don't want to include any mathematics in my "explanations" so I will just summarise Einstein's conclusions he (1) Einstein concluded that the universe was (at least partly) explainable if it was viewed as being composed of four dimensions. These dimensions were height, width, depth and "time". And furthermore, these dimensions combine to form an overall integrated reality which can be referred to as four dimensional "space-time". Or just "space-time" for short. This was Einstein's first "error" - One of the "dimensions" he used to form his "overall integrated reality" doesn't actually exist! (2) Einstein concluded that "gravity" was a manifestation which was produced when "space-time" was "bent" or "distorted" due to the presence of "mass". This was Einstein's second "error" - He attempted to treat "space-time" as if it was actually real, and not just the "mathematical model" that it actually only really is. OK, let's see how Einstein's "relativity theories" do not make the existence of some kind of "carrier medium" superfluous. In fact, they do the exact opposite and actually SUPPORT the existence of some kind of "carrier medium". (1) Einstein's equations predict that "Time slows down when under the influence of acceleration or a gravitational field". We showed earlier that it was actually "existence" and not "time" that "slows down" when under the influence of acceleration or a gravitational field. So, if space is actually empty and contains no kind of "carrier medium" of any kind, what is actually interacting with the matter which is under the influence of acceleration or a gravitational field in order to create the "slowing down" effect? There must be "something" interacting with the matter, otherwise it would not "slow down". Human "conceptualizing" aside, something which does not exist cannot affect something which does exist. So there must be something there which is affecting the matter which is under the influence of acceleration or a gravitational field. We can call this "something" a "carrier medium" or a "luminiferous aether" or anything else we like. But I think that we should give this "something" a definite name pretty soon. Because simple logic dictates that this "something" really does exist. And unlike "time", which only exists as a "concept" - this "something" is a "real" and "integral" part of the fabric of our universe. (2) By saying that "gravity" was a manifestation which was produced when "space-time" was "bent" or "distorted" due to the presence of "mass", it seems that Einstein unfortunately considered his "space-time" to be something which "actually existed" in reality, and was not just a "mathematical model" which was extremely good at predicting the results of various experiments. I believe this to be Einstein's fundamental philosophical "error". A clear case of mistaking the "Map" for the "Territory". I say "I believe" this to be Einstein's fundamental philosophical "error" and not that "it is" Einstein's fundamental philosophical "error" because I am not totally convinced that a person such as Einstein could make such a simple error as this. I have to be totally convinced of something before I am prepared to state it as "fact". But, I have to go on the evidence. You can't bend a "mathematical model" by placing it near to a "large mass". So, I can only assume that Einstein considered his "space-time" to have a physical existence which could actually be "bent" or "distorted" due to the presence of "mass". So, let's see where Einstein went wrong. For a start, we established earlier that time does not actually exist - so the physical existence of something that contains "time" as part of its "structure" is a logical impossibility. OK, we have now established that "space-time" only actually exists as a "concept" and a "mathematical model" and that it really has no actual existence in physical reality. Anyway, Einstein said that mass can bend "space-time"; but we have just proved that "space-time" does not actually have a physical existence. So, obviously, mass is not actually bending "space-time" at all, is it? But something is being bent, because "gravity" still exists even though "space-time" has been relegated to a mere "concept" which has no physical existence. So, let's take everything out of four dimensional "space-time" which is not "real", and see what we have left. OK. Height, that's real, keep it in. Width, that's real, keep it in. Depth, that's real, keep it in. Time, ah that's not real, take it out. So what have we got left for mass to "bend"? Well, we've only thrown away "time". So we've still got height, width and depth left. And, height, width and depth are the three "dimensions" of "physical space". So this is what mass must be "bending". It is now apparent that mass does not bend "space-time". Mass actually bends "space", not "space-time". And it only needs one more logical step to enable us to conclude that "space" cannot be empty. Because, if space was empty, there would be nothing there for mass to "bend" in order to produce the manifestation which we call "gravity". So we have come to the same conclusion that we made in (1) above. This conclusion is that "space" is not empty at all. This conclusion is that "space" MUST contain "something" which is capable if interacting with ordinary "matter" to produce the "effects" or "manifestations" which we call "time-dilation", gravity, inertia, particle/wave duality, and various other things. So there we are. By using the "concept" of "time" in its proper context, it is logical to conclude that Einstein's "relativity theories" actually SUPPORT the existence of some kind of "carrier medium" or "luminiferous aether" or whatever you want to call it. And this conclusion is the exact opposite of the inferences which were drawn when Einstein's equations produced their wonderfully accurate predictions which seemed to make the existence of a "carrier medium" or "luminiferous aether" unnecessary or "superfluous". Actually, modern physics is now starting to seriously explore this "luminiferous ether" theory again, but it's not called the "luminiferous ether" any more. It's now called the "quantum foam" or the "string background" or something similar. One more thing before I leave poor old Einstein alone. I believe that Einstein's equation E = mc^2 has been used by many physicists in their "popular science" books in a way that gives the general public a completely misleading impression of what this equation actually represents. For example: I recently read somewhere that E = mc^2 represents the colossal amount of "energy" that is produced when "matter" is converted directly into "energy". At first glance this seems to be an OK explanation. Any number multiplied be the speed of light squared is certainly going to end up being pretty colossal. There is no doubt about that. But this is not the problem. This explanation leads the general public to believe that matter can be converted into some kind of weird stuff called "energy". And therefore it implies that this "energy" has some kind of independent existence which is separate from "matter". I have asked a few of my (non-scientific) friends what they thought that E = mc^2 actually meant. And some have told me that they are 100% certain that matter can be converted into energy by using atomic bombs or nuclear reactors etc, and that E = mc^2 is the formula that is used to work out the amount of energy which can be produced in the process. Well, they are sort of "half-right" by saying this. But none of my (non-scientific) friends seemed to realise that matter can NOT actually change into "energy". The only thing that matter can change into is other forms of matter. They don't seem to realise that "energy" is a sort of a "catch-all" term which is used to "explain" and "quantify" certain "changing patterns of existence". For example: consider an "annihilation event" in which an electron (-) and a positron (+) collide with each other to produce a "flash of energy". What actually happens in this an "annihilation event" is that the electron and the positron are converted into two "photons". And these two "photons" then fly off somewhere at the speed of light. This is what is meant by "energy". Electrons, positrons AND photons are all "particles of matter". No weird "substance" called "energy" has actually been created in this "annihilation event". The only thing that has been created is a different form of matter. So the term "energy" is just a "representation" of a "changing pattern of existence". I think that "popular science" books should give a better (and less misleading) explanation of what "energy" actually is. As well as "de-mystifying" a few things, let's see what we have been able to conclude by using nothing but simple logic and absolutely no mathematical equations at all. We have concluded that "time" doesn't actually exist. We have concluded that "existence" (not "time") slows down when under the influence of acceleration or a gravitational field. We have concluded that mass actually bends "space" and not "space-time". And from these conclusions we have also been able to conclude that a "carrier medium" or "luminiferous aether" or "quantum foam" or whatever you wish to call it - MUST ACTUALLY EXIST. These conclusions now cause me to ask another question: Why have I had to work all this out for myself? The logic which led to these conclusions is so simple that a child could follow it. So why haven't these conclusions been made by some people who are much "cleverer" than me many years ago? I can think of three possible answers to these questions: (1) I am talking out of my arse, and my "conclusions" are complete nonsense! Or: (2) My conclusions are "correct", and I have found a "new" way of looking at the "structure of reality" which nobody else has identified before. Or: (3) Some of my conclusions are valid, but some of my other conclusions are invalid. I think the most likely answer is number (1) because I can't believe that someone like me, with only an A-Level knowledge of physics, could see something that professors of physics have completely missed. But maybe the correct answer is number (3), I don't know. Anyway, if anybody would like to put me right on a few points: please feel free. I am not frightened of being wrong. I am only interested in finding out whether or not my conclusions are actually valid. I have actually used my "conclusions" to come up with some simple explanations to describe various other "aspects of reality". These include light, the "two-slit" experiment, mass, weight and certain other manifestations of "quantum weirdness". But I will not write them here now; in case someone points out an obvious "error" with something I have already written which may turn my new explanations into nonsense! I hope you enjoyed reading this. And please remember, ALL comments are welcome. |
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Yrael wrote:
"De-Mystifying" Theoretical Physics I am not a professional physicist. I am nothing but an enthusiastic amateur. Neither am I a professional mathematician. I would rate my level of mathematical knowledge as probably just above A-Level standard. So I am unable to manipulate the tensors of String Theory, and I am also unable to completely understand the technical details behind most Quantum Physics experiments. But I believe that my lack of formal knowledge may have actually helped me to uncover certain valid identifications of semantic and philosophical errors in Theoretical Physics which many esteemed professionals either seem to deliberately ignore or not consider as important. Uh Oh.... not a good sign! Reality Check: Has the Second Law Been Falsified http://www.csicop.org/sb/2002-09/reality-check.html Pushing the Second Law to the Limit http://www.aip.org/enews/physnews/2002/split/598-1.html Critical Thinking http://www.csicop.org/si/9012/critical-thinking.html Tuning Up Your Crank Filters http://www.colorado.edu/philosophy/v...fs/Cranks.html Reality Check Has the Second Law Been Falsified? Victor J. Stenger On Thursday, July 18, 2002, 11:09 GMT the BBC Online News reported breathlessly: "One of the most important principles of physics, that disorder, or entropy, always increases, has been shown to be untrue." The article, written by Online News Science editor David Whitehouse, described new observations by scientists at the Australian National University in which the entropy of a system of microscopic beads in a water filled container was found to decrease for periods up to a two seconds. (G.M. Wang et al. Physical Review Letters 89 050601 [2002]). Here's how the BBC explained the significance of this result: The law of entropy, or the Second Law of Thermodynamics, is one of the bedrocks on which modern theoretical physics is based. It is one of a handful of laws about which physicists feel most certain. So much so that there is a common adage that if anyone has a theory that violates the Second Law then, without any discussion, that theory must certainly be wrong. The Second Law states that the entropy-or disorder-of a closed system always increases. Put simply, it says that things fall apart, disorder overcomes everything -eventually. But when this principle is applied to small systems such as collections of molecules there is a paradox. Contrast this report with one provided the previous day by the American Institute of Physics in its online Physics News Update. The article by Phil Schewe, James Riordon, and Ben Stein stated that Australian researchers have experimentally shown that microscopic systems (a nano- machine) may spontaneously become more orderly for short periods of time-a development that would be tantamount to violating the second law of thermodynamics, if it happened in a larger system. Don't worry, nature still rigorously enforces the venerable second law in macroscopic systems, but engineers will want to keep limits to the second law in mind when designing nanoscale machines. This is a far more accurate statement than the one provided by the BBC. In the nineteenth century, Lord Kelvin introduced the second law to describe the observation that heat always flows from hot to cold. The first law of thermodynamics, conservation of energy, allows for energy to be exchanged in any direction. Students and patent officers are taught that the second law forbids a perpetual motion machine-an engine that can do work by taking energy from its environment. Rudolph Claussius framed the second law in terms of a quantity called entropy which is required to remain constant or increase for any isolated system. This implied that certain thermodynamic processes such as heat flow are irreversible. Toward the end of the nineteenth century, Ludwig Boltzmann showed that that second law of thermodynamics is a statistical statement about the behavior of particles. He proved that the molecules of a system tend to approach their equilibrium distribution when started off away from equilibrium. That equilibrium is characterized by a certain quantity H, which is essentially negative entropy, approaching a minimum. In short, Boltzmann basically derived the second law by assuming that matter was composed of particulate bodies-atoms and molecules-and applying Newtonian particle mechanics along with principles of statistics. So, has a violation of the second law of thermodynamics been demonstrated in an Australian laboratory? Hardly. This minimum in H, or maximum in entropy, is just a statistical average and real systems will fluctuate about this average. These fluctuations are very small for the large number of molecules in common objects, but the fact remains that entropy will fluctuate up and down. About the only surprise in these new results is that violations can be found in a system as large as micron-sized beads in water. The authors claim they are consistent with their previously published fluctational theorem, derived from established physics. If the experiment is correct, the beads momentarily gained energy from their environment. However, this perpetual motion machine only worked for about two seconds and is not a likely practical device. Over longer time periods, the average behavior will be governed by the statistics of the second law. The main implication is that engineers building nanoscale machines need to be prepared for them to behave strangely, occasionally running backwards. Such effects may also be seen in microbiology where cells and microbes are of comparable dimensions. An interesting philosophical issue is raised by these results. It has long been known that a direction of time cannot be found in the equations of classical physics. In modern physics, a small time asymmetry is seen in very rare processes, but no known mechanism provides for the stark time irreversibility of common experience. Although the issue is still hotly debated, some quantum processes may even provide evidence for "backward causality," as I discussed in my book Timeless Reality (Prometheus, 2000). Sir Arthur Eddington coined the term "Arrow of Time" to describe the direction of time provided by the second law. In that case, the second law is really not a "law" at all but a definition of the Arrow of Time. The direction of time is simply the direction in which the total entropy of an isolated system increase. As such, it is useful only for systems of large numbers of particles, such as those of common experience. While no physicist will be astonished by the Australian result, philosophers should regard it as an empirical confirmation of the fact that the direction of time is arbitrary. All that prevents sequences of events from happening in the time direction opposite to that of common experience are the laws of chance. About the Author Victor J. Stenger is professor emeritus of physics and astronomy at the University of Hawaii and now lives in the state of Colorado. His Web site is still located at spot.colorado.edu/~vstenger |
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But I believe that my lack of formal knowledge may have actually
helped me to uncover certain valid identifications of semantic and philosophical errors in Theoretical Physics which many esteemed professionals either seem to deliberately ignore or not consider as important. ***************************** A kindred Spirit!!!!!!!!!! |
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hey i did not get you .
its too long i dont have time rght now to reply in detail |
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The body of your message must contain some text.
OK I love ewes. |
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Yrael wrote:
"De-Mystifying" Theoretical Physics I am not a professional physicist. I am nothing but an enthusiastic amateur. Neither am I a professional mathematician. I would rate my level of mathematical knowledge as probably just above A-Level standard. So I am unable to manipulate the tensors of String Theory, Well, tensors already appear well below String theory... and I am also unable to completely understand the technical details behind most Quantum Physics experiments. But I believe that my lack of formal knowledge may have actually helped me to uncover certain valid identifications of semantic and philosophical errors in Theoretical Physics which many esteemed professionals either seem to deliberately ignore or not consider as important. Uh oh. Doesn't sound like a good start. Essentially you are saying "because I don't know much about physics, I am better able to judge errors in physics than the actual physicists". I, however, feel that identifying and explaining these semantic and philosophical errors is extremely important. My identifications are not "earth shattering". They don't contain anything which is not already totally obvious to any professional physicist. So I don't believe for one second that any explanations I write here will help any professional physicists with their actual research or anything like that. My ego is not that big! But I do believe that these explanations may help (some) professional physicists when they write their "popular science" books and attempt to "de-mystify" Theoretical Physics for the general public. I have come to the conclusion that some of the explanations I have read in "popular science" books do not actually "explain" anything at all. And I have also read some attempts at "de-mystification" which have actually left me feeling more "mystified" than I was in the first place! Well, I have to agree with that. We may not know exactly how the "Universe" works, but most of us know how "politics" works. Politicians want to stay in Office, and to do this they must gain public support. It is not in the politicians' own self interest to give research grant money to something which the general public feels "alienated" from. This is obviously why Theoretical Physics must be made more accessible and interesting to the general public. And explanations written by top scientists which do not actually "explain" anything are not really helping matters. I, and thousands of other enthusiasts, would love to see a "Supercollider" built with an energy capacity which may be capable of proving the existence of the "Higgs Boson" or something similar. Well, such a collider is already built: the LHC. Ever heard of it? So my "de-mystifying" identifications and explanations are my, unfortunately miniscule, contributions to the cause. The first thing I would like to address is the way the "mystery" which physicists call "The Arrow of Time" is treated in most popular science books. In their "Arrow of Time" discussions, many esteemed physicists pose the question of: "Why does time always flow forwards?" Or, stated another way: "Why does time never flow backwards?" And they then go on to attempt to answer these questions by talking about thermodynamics and entropy etc. I will show that even asking these questions is semantically and philosophically incorrect. And I will also show that their thermodynamic/entropic explanations are actually attempting to answer a completely different (but semantically valid) question. Furthermore, I will give a totally complete and correct answer to the semantically and philosophically ridiculous question of "Why does time never flow backwards?" in just one short sentence. There is no need for a whole chapter of a book to answer this question; one short sentence is completely sufficient. But I have never read this "one sentence explanation" in any popular science book, and I really don't know why it is not used in ALL physics related popular science books! In order for the "Arrow of Time mystery" to become totally non-mysterious, we first need to understand what time actually is. For physicists, time is that which is measured by clock. Some esteemed physicists do not seem to fully understand a principle called "The Map is not the Territory". Time appears in their equations along with other variables like mass etc which actually exist in reality; and because of this, they seem to see time as a real facet of existence (like mass etc). Sorry, I don't see the difference. If you say that "time" is merely a property of the "map", but does not actually exist in reality, I think you have to say the same about mass. And vice versa. And, consequently, they seem to think that they can use time to explain things in the same way as they would use other real facets of existence (like mass etc) to explain things. This is the problem! It isn't, so they can't! And the basis for that claim is what? And if they do, their explanations are worthless because they are not actually "explaining" anything at all! I have actually read a book in which an esteemed physicist attempted to answer the "Why does time never flow backwards?" question by referring to a thermodynamic equation (in which "time" was one of the variables) as part of his explanation. This is patently ridiculous. You can't explain the properties of a "something" by using that same "something" as part of the explanation. Err, why not? How on earth could I explain the properties of *any* physical "thing" without referring to equations in which this "thing" appears? Even if the "something" is actually real, you are not actually explaining anything at all if you do that. And what makes this physicist's "explanation" even more ridiculous is the fact that he was using an equation which exhibits "time-reversal symmetry" (as do all these type of equations) in an attempt to show why "time never flows backwards"! There are lots of equations in thermodynamics which are *not* time-reversal symmetric. What equation was he using, specifically? What book are you talking about? What this physicist was actually attempting to do was to answer this completely different (but semantically valid) question, as I mentioned earlier. And that completely different question is? I cannot believe that he didn't seem to realise that this was what he was actually doing! So I can only assume that he was deliberately ignoring it, or didn't feel that it was important. Did you ever consider the possibility that his explanation was perhaps perfectly valid, but you simply misunderstood him? Anyway, the point I am making is that this "non-explanation" didn't help the general reader at all. Even the great Albert Einstein made a subtle variation of this same fundamental philosophical "error" in his theories of special and general relativity. And this error caused Einstein (and everyone else) to draw inferences about the "structure of reality" which are actually totally opposite to the inferences they could have drawn if this fundamental error had not been made. I will fully explain Einstein's fundamental philosophical "error" shortly. But, as I said earlier, in order to understand "The Arrow of Time" and Einstein's fundamental philosophical error, you will first need to be armed with a complete understanding of what time actually is. So, here we go! What actually is time? This is an "official" definition of time: "Time is a dimension that enables two otherwise identical events that occur at the same point in space to be distinguished. -- A Dictionary of Physics (ISBN: 0-19-280030-2)" Looks sensible, in a way, but not very useful; and I don't think it is really entirely valid. I told you already above what definition physicists actually use. I believe that calling time a "dimension" is seriously misleading to the general public. To include time as a dimension along with the other three dimensions of height, width and depth to make four dimensional "space-time" creates a major area of "misunderstanding" for the general public. Well, it's a fact that time is a dimension. Do you suggest we lie to the public? It allows people to believe that they can treat the "dimension" of "time" in the same way as they can treat the other three dimensions. And, therefore, it allows people to ask totally illogical questions like: "Why does time never run backwards? etc. So far, you have still not told us why that question is illogical. Additionally, I don't see why treating time as a dimension should lead to this question. Most people do not realise that four dimensional "space-time" is nothing but a "mathematical model" which happens to be extremely good at predicting the results of various experiments. Err, if you did not notice: three-dimensional space is in the same sense "nothing but a mathematical model which happens to be extremely good at predicting the results of various experiments". In fact, Einstein's equations were so successful at predicting the results of experiments that people started believing that these "mathematical models" actually WERE REALITY and not just representations of reality. Well, you appear to believe the same thing about three-dimensional space, aren't you? But, however accurate at predicting "reality" Einstein's equations are, they are NOT actually REALITY. They are nothing but mathematical REPRESENTATIONS OF REALITY which happen to be able to predict ACTUAL REALITY extremely well. To confuse a "representation of reality" with "actual reality" is to fail to understand a principle called "The Map is not the Territory". I believe that "The Map is not the Territory" type of misunderstanding is very common among the general public. And even some esteemed physicists seem to fall victim to it on the odd occasion. Anyway, back to my question: What actually is time? Here are some "semantically and philosophically correct" definitions/descriptions of what time actually is: And who judges if these definitions are correct? You? Unlike other "things" like mass etc, time does not actually exist. Wow. So past, present and future don't exist, too? Time is definitely not a "dimension" in the same sense as the other three "dimensions" of height, width and depth. It is. It has merely another signature in the metric. In fact, time is nothing but a totally man-invented "concept", and it has no "real" existence in the fabric of the universe whatsoever. Time is nothing but a "concept" which we human beings (unconsciously) invented in order to make "changing patterns of existence" intelligible and quantifiable to us. So, for animals, plants, and non-living objects, time does not pass? Past, present and future are one and the same for them? Or, stated in another way, "Time IS changing patterns of existence". To talk about time outside of the context of existence (or more correctly: "changing patterns of existence") would be completely nonsensical and totally invalid. In the last paragraph, I gave a precise definition/description of time. Do you mean the sentence "Time IS changing patterns of existence"? I wouldn't call that a "precise definition". [snip lots more] I don't think this leads anywhere useful. Bye, Bjoern |
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My reply has been provoked by reaction on you message in this group. In any area of expertise there is very different level of competence - VERY different. I think that today the distribution of IQ levels upon physicists is quite similar to IQ distribution among general public with university education. What percentage of really smart people you have met with? Taking into account that physicist's education is not the most attractive in sense of social success, the most gifted part of US generation moves to business development, financial.. etc. The mass media image of scientist is a quite good illustration of its social status. This tendency is correct and for Europe and for all developed countries as well (at different degree). During cold war the situation was quite different especially in the end of 50s and beginning 70s. Currently the demand for advanced scientists is covered mainly by immigrants by outsourcing and by old generation of scientists. The trivial example that notion which has to be defined can not be used for its own definition is quite evident and one of patronizing reply above is probably a quite representative example of intellectual "superiority" of average physicist in this group. Regards, Stefan Yrael wrote: "De-Mystifying" Theoretical Physics I am not a professional physicist. I am nothing but an enthusiastic amateur. Neither am I a professional mathematician. I would rate my level of mathematical knowledge as probably just above A-Level standard. So I am unable to manipulate the tensors of String Theory, and I am also unable to completely understand the technical details behind most Quantum Physics experiments. But I believe that my lack of formal knowledge may have actually helped me to uncover certain valid identifications of semantic and philosophical errors in Theoretical Physics which many esteemed professionals either seem to deliberately ignore or not consider as important. I, however, feel that identifying and explaining these semantic and philosophical errors is extremely important. My identifications are not "earth shattering". They don't contain anything which is not already totally obvious to any professional physicist. So I don't believe for one second that any explanations I write here will help any professional physicists with their actual research or anything like that. My ego is not that big! But I do believe that these explanations may help (some) professional physicists when they write their "popular science" books and attempt to "de-mystify" Theoretical Physics for the general public. I have come to the conclusion that some of the explanations I have read in "popular science" books do not actually "explain" anything at all. And I have also read some attempts at "de-mystification" which have actually left me feeling more "mystified" than I was in the first place! We may not know exactly how the "Universe" works, but most of us know how "politics" works. Politicians want to stay in Office, and to do this they must gain public support. It is not in the politicians' own self interest to give research grant money to something which the general public feels "alienated" from. This is obviously why Theoretical Physics must be made more accessible and interesting to the general public. And explanations written by top scientists which do not actually "explain" anything are not really helping matters. I, and thousands of other enthusiasts, would love to see a "Supercollider" built with an energy capacity which may be capable of proving the existence of the "Higgs Boson" or something similar. So my "de-mystifying" identifications and explanations are my, unfortunately miniscule, contributions to the cause. The first thing I would like to address is the way the "mystery" which physicists call "The Arrow of Time" is treated in most popular science books. In their "Arrow of Time" discussions, many esteemed physicists pose the question of: "Why does time always flow forwards?" Or, stated another way: "Why does time never flow backwards?" And they then go on to attempt to answer these questions by talking about thermodynamics and entropy etc. I will show that even asking these questions is semantically and philosophically incorrect. And I will also show that their thermodynamic/entropic explanations are actually attempting to answer a completely different (but semantically valid) question. Furthermore, I will give a totally complete and correct answer to the semantically and philosophically ridiculous question of "Why does time never flow backwards?" in just one short sentence. There is no need for a whole chapter of a book to answer this question; one short sentence is completely sufficient. But I have never read this "one sentence explanation" in any popular science book, and I really don't know why it is not used in ALL physics related popular science books! In order for the "Arrow of Time mystery" to become totally non-mysterious, we first need to understand what time actually is. Some esteemed physicists do not seem to fully understand a principle called "The Map is not the Territory". Time appears in their equations along with other variables like mass etc which actually exist in reality; and because of this, they seem to see time as a real facet of existence (like mass etc). And, consequently, they seem to think that they can use time to explain things in the same way as they would use other real facets of existence (like mass etc) to explain things. This is the problem! It isn't, so they can't! And if they do, their explanations are worthless because they are not actually "explaining" anything at all! I have actually read a book in which an esteemed physicist attempted to answer the "Why does time never flow backwards?" question by referring to a thermodynamic equation (in which "time" was one of the variables) as part of his explanation. This is patently ridiculous. You can't explain the properties of a "something" by using that same "something" as part of the explanation. Even if the "something" is actually real, you are not actually explaining anything at all if you do that. And what makes this physicist's "explanation" even more ridiculous is the fact that he was using an equation which exhibits "time-reversal symmetry" (as do all these type of equations) in an attempt to show why "time never flows backwards"! What this physicist was actually attempting to do was to answer this completely different (but semantically valid) question, as I mentioned earlier. I cannot believe that he didn't seem to realise that this was what he was actually doing! So I can only assume that he was deliberately ignoring it, or didn't feel that it was important. Anyway, the point I am making is that this "non-explanation" didn't help the general reader at all. Even the great Albert Einstein made a subtle variation of this same fundamental philosophical "error" in his theories of special and general relativity. And this error caused Einstein (and everyone else) to draw inferences about the "structure of reality" which are actually totally opposite to the inferences they could have drawn if this fundamental error had not been made. I will fully explain Einstein's fundamental philosophical "error" shortly. But, as I said earlier, in order to understand "The Arrow of Time" and Einstein's fundamental philosophical error, you will first need to be armed with a complete understanding of what time actually is. So, here we go! What actually is time? This is an "official" definition of time: "Time is a dimension that enables two otherwise identical events that occur at the same point in space to be distinguished. -- A Dictionary of Physics (ISBN: 0-19-280030-2)" I believe that calling time a "dimension" is seriously misleading to the general public. To include time as a dimension along with the other three dimensions of height, width and depth to make four dimensional "space-time" creates a major area of "misunderstanding" for the general public. It allows people to believe that they can treat the "dimension" of "time" in the same way as they can treat the other three dimensions. And, therefore, it allows people to ask totally illogical questions like: "Why does time never run backwards? etc. Most people do not realise that four dimensional "space-time" is nothing but a "mathematical model" which happens to be extremely good at predicting the results of various experiments. In fact, Einstein's equations were so successful at predicting the results of experiments that people started believing that these "mathematical models" actually WERE REALITY and not just representations of reality. But, however accurate at predicting "reality" Einstein's equations are, they are NOT actually REALITY. They are nothing but mathematical REPRESENTATIONS OF REALITY which happen to be able to predict ACTUAL REALITY extremely well. To confuse a "representation of reality" with "actual reality" is to fail to understand a principle called "The Map is not the Territory". I believe that "The Map is not the Territory" type of misunderstanding is very common among the general public. And even some esteemed physicists seem to fall victim to it on the odd occasion. Anyway, back to my question: What actually is time? Here are some "semantically and philosophically correct" definitions/descriptions of what time actually is: Unlike other "things" like mass etc, time does not actually exist. Time is definitely not a "dimension" in the same sense as the other three "dimensions" of height, width and depth. In fact, time is nothing but a totally man-invented "concept", and it has no "real" existence in the fabric of the universe whatsoever. Time is nothing but a "concept" which we human beings (unconsciously) invented in order to make "changing patterns of existence" intelligible and quantifiable to us. Or, stated in another way, "Time IS changing patterns of existence". To talk about time outside of the context of existence (or more correctly: "changing patterns of existence") would be completely nonsensical and totally invalid. In the last paragraph, I gave a precise definition/description of time. But this precise definition of time does not provide a complete "explanation" of what time actually is, nor does it give any real indication of what valid conclusions can be drawn from it. So, because it is essential to completely understand exactly what time actually is in order to proceed further, I will now spend some time giving a few examples and "scenarios" etc. Hopefully, by the end of this next section, the exact nature of time will be so familiar to you that it will just become "second nature" to think about time in this "new" way. First of all, it's important to completely understand the answer to this question: "How do we actually measure time?" The short answer is that the only possible way we can measure time is by counting (and sometimes comparing) "changing patterns of existence". And the more similar these "changing patterns of existence" are to each other, the more "accurate" our "measure of time" will be. A good example of this is a grandfather clock. Some very handy laws of nature have decreed that, whether a pendulum is swinging quickly or slowly, each swing of that pendulum will take the same amount of "time". This is (basically, but not exactly) how a Grandfather clock works. Each swing of the pendulum moves a cogwheel one notch, and this is translated by others cogs etc to the movements of the hands on the clock face. So basically we are counting "changing patterns of existence" by using a cogwheel to count each swing of the pendulum. And because these "changing patterns of existence" are similar, our "measure of time" will be "accurate". You could argue a semantic point here with me by saying that "You are not measuring a "CHANGING pattern of existence" because the "duration" of the pendulum's swing IS ALWAYS THE SAME". But this is not what I mean by "changing patterns of existence". I mean that the "actual pattern of existence" is changing. For example: If you were to make a video recording of your grandfather clock's swinging pendulum, and then play it back frame by frame; you would see the pendulum in a slightly different position in each frame. Each frame would show you a slightly different "pattern of existence" which had changed from the previous one. And even if you were to compare different frames which showed the pendulum to be in exactly the same position, that would only confirm to you that the "pattern of existence" was repeating. You could easily confirm that the actual "pattern of existence" was really changing by looking at the frames before and after the frame you were originally looking at. Just because a "pattern of existence" is repeating, it does not mean that it isn't changing. In fact, if a "pattern of existence" is repeating, it actually proves that it IS changing. It has to change to a different "pattern" in order to be able to repeat its previous "pattern". If it didn't change, it wouldn't be repeating. It would just be staying the same. Now that we have established that a repeating "pattern of existence" must also be a "changing pattern of existence", we can further clarify things by using t |