On 2/1/2020 4:41 AM, Alan Grayson wrote:
On Saturday, February 1, 2020 at 5:20:43 AM UTC-7, John Clark wrote:
On Fri, Jan 31, 2020 at 10:47 PM Alan Grayson <[email protected]
<javascript:>> wrote:
/> My point is that the CMB "clock" exists everywhere, and
that it has no relative motion wrt anything, so how can time
dilation be applied to it? AG/
It can't. Nobody said the CMB looks the same for everybody
regardless of their motion. It doesn't. But if you and I are in
relative motion then I will see my local clock running faster than
your local clock, and you will see your local clock running faster
than my local clock. And the CMB has absolutely nothing to do with
it because Time Dilation is about what local clocks do.
John K Clark
But what if the CMB _is_ the local clock? How could it manifest time
dilation, compared to a clock in some moving frame, if its "clock"
reading doesn't change? AG
There no moving vs stationary frames. All motion is relative. If a
clock's reading doesn't change, it's stopped. It's not marking time.
It is easy to observe time dilation of a clock synced to the CMB...just
be in motion relative to it.
Brent
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