On 1/24/2020 7:57 PM, Alan Grayson wrote:
In the equation "t" is just a parameter. The physical clock is
the expansion itself, which is most conveniently measured by the
CMB temperature.
OK, but then, as I suggested many moons ago, there IS such a thing as
absolute motion, and it's with respect to the CMB. AG
It's no more absolute motion than my motion relative to the Moon is
absolute. It's motion defined relative to a physically meaningful
frame, particularly for cosmological calculation. But the dynamic
equations of physics are independent of motion relative to it. The
Earth is moving at 368 km/sec relative to the CMB, but we don't have to
put that into any of our equations.
Brent
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