Re: GR THEORY IS NOT EVEN FALSE!

mluttgens@xxxxxxxxxx wrote:
On Apr 11, 2:02 am, carlip-nos...@xxxxxxxxxxxxxxxxxxx wrote:
[...]

I don't see any problem.  Your "quantum theory" method
assumes that gravity can be described by a Newtonian
potential.  In a weak field, this is a good approximation;
in a strong field, it isn't.  

Steve Carlip

Of course, the "quantum" formula gives results,
which are different from the GR strong field formula.
The question is why?

To start with, because your "quantum" formula is based
on an observably incorrect description of gravity. Keep in
mind that "escape velocity" is a characteristic of orbits
-- it's the maximum velocity for a parabolic orbit. The
expression you use for escape velocity is one from Newtonian
gravity, which gives a manifestly incorrect description of
orbits.

You could, I suppose, take the position that although GR is
observed to be correct, and Newtonian gravity wrong, for
elliptical and hyperbolic trajectories, one should suddenly
revert to Newtonian expressions for parabolic trajectories.
But that would be too bizarre to be worth further discussion.

Could the GR formula not be applicable to light?

The GR formula is right if GR is right. This is ultimately a matter
for experiment.

For the particular question you are asking, there is not yet an
experiment that is accurate beyond the first order approximation.
(There are proposals to put an atomic clock on a future NASA
solar probe, which would allow higher order tests, but this will
not happen for some time.) But the closely related GR predictions
for the motion of planets and of light in a gravitational field are
well-tested, and the corresponding Newtonian predictions are
observably wrong.

Steve Carlip
.

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