On 29-01-2020 10:31, Alan Grayson wrote:
On Wednesday, January 29, 2020 at 1:57:25 AM UTC-7, Alan Grayson
wrote:
Considering the distant galaxies, they're receding at near light
speed. So according to SR, their clocks should be ticking at a much
slower rates than, say, a local clock in our galaxy. OTOH, there's a
physical clock for the entire universe; namely, the temperature of
the CMBR. If we tell time by this clock, all clock readings of all
galaxies are identical. So which is it? Are clocks in distant
galaxies running slower than a local clock in our galaxy, or are
both clocks running at the same rate? TIA, AG
Obviously, the temperature of the CMBR declines exceedingly slowly,
making it an inconvenient clock, but it's still a clock, making the
question above sensible. AG
It's equivalent to a purely SR problem with 3 observers, two of them
moving away with opposite velocities from the third.
Saibal
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