"Old Man" wrote in message news:3f08c0d0_4@newsfeed...
| Gordon D. Pusch wrote in message
| ...
| "Old Man" writes:
|
| Gordon D. Pusch wrote in message
| ...
| "Old Man" writes:
| [...]
| Rest mass of a single photon is zero, and a single
| photon doesn't have a rest frame. However, observe that two
| photons, with identical energy, E, but with appositely directed
| momentum, E / c = p1 = -p2, have total rest energy of 2*E wherein
| the gravitational mass of the two photon system is M = 2*E / c^2.
| In the center of momentum system, total energy gravitates. If
| the two photons are travling in the same direction, such that
| p1 = p2, then the total rest energy is zero because, in this case,
| it is impossible to define a center of momentum frame.
|
| The "rest frame energy" (actually, "Center of Momentum frame energy")
| is not "zero" in the "parallel" case, but rather =UNDEFINED=, because
| _NO SUCH "REST FRAME" EXISTS_.
|
| And in any event, such hand-waving attempts to make naive analogies
| between Einsteinian and newtonian physics are at best ill-justified,
| and at worst, JUST PLAIN =WRONG=. Newtonian physics is the "weak
field,
| slow motion" approximation to General Relativity --- and photons
CANNOT
| be considered "slow moving" in any Einsteinian sense !!!
|
| Pusch suffers from delusions of competence. [Old Man]
|
| "{Old Man]" suffers from projection of his own delusions of competence
on
| others, as well as some VERY peculiar notions regarding how relativistic
| physics works --- no doubt because he is largely self-taught (as I
believe
| he has admitted in this forum), and has not interacted sufficiently with
| other physicists during this process to correct his own conceptual
errors.
| I strongly suggest he crack the books again, because he is quite, quite
| wrong in this case.
|
| The correctness of Pusch's assumptions about Old Man are on par
| with his inability to see through his own delusions of competency.
| [Old Man]

I smell a plonk coming.

FF