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Old May 4th 08 posted to sci.physics.relativity
Albertito
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Posts: 680
Default The speed of gravity revisited

On May 4, 4:11 pm, Mike wrote:
On May 4, 2:05 am, Koobee Wublee wrote:

On May 3, 8:37 am, Tom Roberts wrote:


Tom Van Flandern wrote:
The premises that arise from logic alone rather than from experiments
or observations or philosophy or mathematics include these:
** Causality: Every effect has an antecedent, proximate cause.
** Creation: No creation ex nihilo; and no demise ad nihil


This approach to science was abandoned during the Renaissance, when it
was learned CONCLUSIVELY that this approach does not describe the world
we actually inhabit. In particular, your statements here are VASTLY too
imprecise to be useful. And they are not valid in modern physics:


Observing an effect without knowing a cause is not understanding the
issues involved. shrug


I agree if, and only if, there is a cause. If a cause is not there or
necessary then it is an empty statement.

Causes, are also first or final. Scholastic philosophy was based on
final causes and religion of first causes. Which causes are you for
KW?



** No theory of physics expressed in terms of differential equations
has your NAIVE "causality". Such equations describe correlations,
but correlation is not causation.


Speed of gravity is not an issue of causality. It is strictly an
issue of how fast a change in gravitational effect can propagate.
According to SR, the intuitive conjecture is that the speed of gravity
is the same as the speed of light. The speed of light is explained
definitively and thoroughly by the Maxwell’s equations. However, any
of the mathematics involved in GR does even describe what the speed of
gravity is. The field equations do not tell you how gravitational
waves propagate. Believing it otherwise is a myth. Mysticism is not
wisdom.


There is no such thinmg a "speed of gravity" like there is no such
thing as "speed of a smile".


"speed of a smile" exists. If you can't react
with a smile almost instantaneously to a
clever joke, then you are a retard :-)





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