Re: Cosmology and Relativistic vector addition/subtraction of velocities
- From: "John (Liberty) Bell" <john.bell@xxxxxxxxxxxxxxxxxx>
- Date: Tue, 6 Mar 2007 13:48:32 +0000 (UTC)
On Feb 28, 12:54 pm, hel...@xxxxxxxxxxxxxxxxxxxxxxxx (Phillip Helbig---
remove CLOTHES to reply) wrote:
In article <1172559521.623516.214...@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
"John (Liberty) Bell" <john.b...@xxxxxxxxxxxxxxxxxx> writes:
especially if one is considering the limiting case (Milne) general
relativistic solution, where the cosmological constant is zero, and
the mass is zero. This point is not totally academic as this is the
reference model against which astronomers plot the observable dynamics
of the accelerating expansion of the universe
Some astronomers, not all.
Point accepted
This model has no special physical
significance.
Well, it _should_ have special physical significance. With no mass,
and no Lambda, test points _should_ then obey the simple laws of
inertial physics (and SR). If not, there would seem to be something
seriously wrong with EFE since I understood that GR is supposed to
reduce to SR, in the absence of gravity and acceleration.
(I am now really confused about this)
John.
.
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