Re: The speed of gravity revisited

I just realized I said something wrong:

Tom Roberts wrote:
Tom Van Flandern wrote:
This field is the physical equivalent of the light-carrying medium,
[this is TVF's fantasy theory, not GR]
Yes, if one only considers elementary situations with
weak fields, one could probably concoct a model of a
"light-carrying medium" that approximates the predictions
of GR for such physical situations. [...]

Nope, that is not possible. Such a "medium" could not possibly reproduce the gravitational time dilation between clocks at rest in a valley and on a mountaintop; nor could it reproduce the time dilation between relatively-moving clocks at the same gravitational potential.

If one attempted to invoke two different solutions (e.g. that "medium" for light and some magical "time dilation medium" for clocks that somehow "knows" about both gravitational potential and relative motion), then there would be double-counting for light rays between such clocks.

It's also not obvious that such a "medium" could reproduce observations of electric and magnetic fields. Indeed, all of the problems with aether theories and SR would arise.

Do not deceive yourself into thinking "all clocks use EM".
Spinning objects are clocks that use no EM in their time-
keeping mechanism, and GR predicts time dilation between
such mechanical clocks. Whether or not we have observed
such dilation is irrelevant, as this discussion is about
the structure of theories, and it's QUITE CLEAR that
TVF's fantasy theory cannot possibly be equivalent to GR.


Tom Roberts
.

Relevant Pages

  • Re: The speed of gravity revisited
    ... The effect of velocity on clocks represented by the Lorentz transformations ... It is very clear from the following that LR manifests time dilation. ... special relativity [see Ref. ... light-carrying medium. ...
    (sci.physics.relativity)
  • Re: Time Dilation Model, NO ONE can point out whats wrong
    ... A and B are adjacent and they both set their clocks to zero. ... what suffers the later measured time dilation when the two clocks are ... SR states that is the speed (not the acceleration) what causes the ... Any attempt to use an inertial frame to describe a body that ...
    (sci.physics.relativity)
  • Re: Time Dilation Test
    ... This includes time dilation due to the earth's rotation ... > their flying clocks with a stationary one in Denver. ... and gravitation when comparing clocks accurately. ... Einstein addressed the twin paradox in special relativity ...
    (sci.physics.relativity)
  • Re: The clock malfunctioned.
    ... that has been known about clocks for centuries. ... and not based on atomic clocks, confirms so-called time dilation? ... Theories make *quantitative* predictions. ... special relativity, and the collection of these experiments also serve ...
    (sci.physics)
  • Re: SR time dilation on remote objects ?
    ... As no inertial frame can be found in the Universe, ... By way of a thought experiment, proving that mutual time dilation ... All three clocks are set to 0. ... observer A situated at a distance d from observer B ...
    (sci.astro)