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  • =?UTF-8?Q?Re=3A_A_SLOW_clock_+_A_SHORT_ruler_=3D_=28a=C2=B2=2Ca?= =?UTF

    From Tom Roberts@21:1/5 to George Hammond on Mon Dec 18 09:30:18 2023
    On 12/8/23 4:45 PM, George Hammond wrote:
    If you use a clock that is "slow" by a factor "a" where a=a (t),
    and likewise use a ruler that is SHORT by the same factor "a" [...]

    In GR, no clock is ever "slow" and no ruler is ever "short" -- you are confusing a coordinate difference with an invariant duration or length.

    Tom Roberts

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