On Sunday, October 27, 2019 at 8:05:47 AM UTC-6, John Clark wrote:
>
> On Sat, Oct 26, 2019 at 5:24 PM Alan Grayson <[email protected]
> <javascript:>> wrote:
>
> > *GR is a classical theory, which assumes a classical space-time field.*
>
>
> General Relativity assumes space and time are continuous and infinitely
> divisible, Quantum Mechanics assumes it is not, hence our 2 best physical
> theories are incompatible and that makes physicists unhappy.
>
Quantum mechanics makes no particular prediction on the continuity of
spacetime. If one equates the Schwarzschild radius with a Compton
wavelength you get the Planck scale of 1.6x10^{-35}m. However, this really
just tells us one is not able to locate a qubit in a region smaller than
this scale. The Fermi and Integral spacecraft data on arrival times of
different wavelengths of radiation from burstars indicates spacetime is
smooth to two orders of magnitude smaller than the Planck length.
LC
>
>
> > *But if you assume a classical field at the microscopic level, will GR
>> give answers which are contradicted by measurements?*
>
>
> Every time we've tested General Relativity it has easily passed the test,
> but nobody has made a measurement at the singularity in the center of a
> Black Hole where spacetime is infinitely curved, at that point General
> Relativity breaks down and can no longer tell us what's going on.
>
> John K Clark
>
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