- #1
Vincentius
- 78
- 1
My question is if the pace of cosmic time changes over time or not. I think this is identical to asking if the rate of a comoving clock changes over time.
The FRW metric holds at any time, but only the spatial part expands:
ds2=c2dt2-a(t)2dx2
Apparently, there is no time delation in the metric, but that does not mean that a physical clock in the past ran at the same pace as today.
Can anyone explain or give a reference on the subject?
Thanks
The FRW metric holds at any time, but only the spatial part expands:
ds2=c2dt2-a(t)2dx2
Apparently, there is no time delation in the metric, but that does not mean that a physical clock in the past ran at the same pace as today.
Can anyone explain or give a reference on the subject?
Thanks