On 10/12/2020 10:20 PM, Alan Grayson wrote:
On Monday, October 12, 2020 at 11:11:33 PM UTC-6, Brent wrote:
On 10/12/2020 9:56 PM, Alan Grayson wrote:
> Why is it that in SR a stationary clock appears to advancing at
a more
> rapid rate than a moving clock, and vice versa -- so the effect is
> relative or symmetric, not absolute -- whereas in GR the effect
seems
> absolute; that is, a ground clock actually advances at a slower
rate
> compared to an orbiting clock? AG
It's the same as the twin effect. The clock on the ground is
following
a non-geodesic path thru spacetime and so measures less duration,
while
the orbiting clock is following a geodesic path. In relativity the
minus sign in the metric means that the path that looks longer
projected
in space is shorter in spacetime.
Brent
How does gravity cause the difference between what the theories
predict? AG
It curves the time axis (mainly). Don't you have a copy of Epstein's
"Relativity Visualized"?
Brent
--
You received this message because you are subscribed to the Google Groups
"Everything List" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To view this discussion on the web visit
https://groups.google.com/d/msgid/everything-list/cf7d334b-42f5-651a-9ceb-92963d9859cc%40verizon.net.
