On 1/31/2020 12:04 AM, Alan Grayson wrote:
On Thursday, January 30, 2020 at 10:37:13 PM UTC-7, Brent wrote: On 1/30/2020 5:37 PM, Alan Grayson wrote:On Thursday, January 30, 2020 at 6:29:18 PM UTC-7, Alan Grayson wrote: On Thursday, January 30, 2020 at 5:09:56 PM UTC-7, Brent wrote: On 1/30/2020 12:45 PM, Alan Grayson wrote:That's not it. I think the two observers, one in a galaxy far removed and one here, would read the same CMBR "time", regardless of the distant galaxy's speed of recession. But relativity says otherwise. This is what puzzles me. AGAsk yourself /*when*/ do they read the same time. Brent I don't know if this helps. Since the temperature of the CMBR is the same everywhere, at any time t, we can in principle determine if the two measurements are simultaneous or not. AG But regardless of simultaneity or not, there's no dilation of this clock! (And AE doesn't say what a clock is.) What the hell is going on? AGThe clocks used in relativity examples are the whatever the most perfect and stable clock in existence are (in this case cesium atom clocks). They always measure proper time thru spacetime. The only reason that when compared they seem to register different durations is because they traveled different paths thru spacetime and these paths had different proper length. "Time dilation" is not some function of the clock...it's a function of the path the clock is measuring. Remember my odometer analogy? BrentGiven that the temperature of the CMBR is the same for every location in space-time, it follows that time dilation is not a property of THIS clock.
Time dilation is a property of one clock (or one path) relative to another. It's called relatvity theory of a reason.
For this clock, which is NOT moving through space-time, paths through space-time are irrelevant. AG
Clocks that aren't moving thru spacetime are stopped. You're thinking of clocks that aren't moving thru space.
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