- #71
Nugatory
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A change in speed does not affect the clock rate. If it did we could identify a true rest frame of the universe - it would be the only frame in which a clock at rest in that frame is unaffected.Frodo said:If, as in the twin paradox, the acceleration causes a change in speed then this does does affect the clock rate.
Or consider that right now you are moving at almost
Velocity-based time dilation, the stuff they talk about in introductory presentations where they say that a moving clock ticks slow, is a consequence of the relativity of simultaneity - and has next to nothing to do with why that the traveller ages less than the stay-at-home twin. One way of seeing this is that the stay-at-home twin’s clock is dilated relative to the traveller’s clock at every moment of the journey - yet the traveller ages less.
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