Re: Is c really constant in a strong grav field?

Koobee Wublee wrote:
"Tom Roberts" <tjroberts@xxxxxxxxxx> wrote in message news:gb8Te.335$mj1.229@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Actually, it would be c*sqrt(|g_tt/g_xx|) for propagation along the x axis.
[...]

The speed of light in vacuum should be a scalar quantity [...]

No. Being a scalar implies being invariant under all possible changes of coordinates, and it simply is not possible to do that for a ratio of coordinate values like speed. The speed of light is a universal constant, not a scalar; that is, its constancy is not related to invariance under coordinate transforms; in any case it is constant only for certain measurements (standard clocks and rulers in a locally-inertial frame).

	This is the flip side of someone's comment that the speed of
	cannot be a scalar because it is not "invariant" under a change
	of units.


yet you are thinking along the same line as crackpots of SR-antagonists. Apparently, you have found an 'operator' to apply to GR. This opens yourself to honorary titles of crackpots.

Huh?? I have no idea where you got this. I merely APPLIED GR to the situation being discussed. <shrug>


So, you do not accept GR after all these thousands of posts.

Not true. Clearly you did not understand what I wrote, or how it relates to GR.


Tom Roberts	tjroberts@xxxxxxxxxx
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