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Physics, Astronomy & Cosmology / Re: Where did the big bang come from?
« on: 25/05/2024 05:28:44 »You say time dilation is a coordinate effect and not a physical one. However if I start with two synchronised clocks, keep one in my house and send the other off on a zillion mph hi tech craft for lets say, one year, and then reunite them there will be a physical difference. What say you?The dilation is due to the speed difference. In one frame, the zoomy clock is moving at a zillion mph and runs slower, but relative to a different inertial frame, the zoomy outgoing clock is stationary and it is your house clock that is moving, and is thus running slow. That's what I mean by it being a coordinate effect. Which clock runs faster during some duration depends on the choice of coordinate system.
The comparison when the two clocks are reunited is the example of differential aging, and that is objective, since the different readings of the two clocks at that event is the same regardless of choice of coordinate system. So differential aging is physical, objective, and frame invariant.
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