On 10/1/2025 6:19 AM, John Clark wrote:
On Wed, Oct 1, 2025 at 8:29 AM Alan Grayson <[email protected]>
wrote:
/> Have physicists in the last 120 years claimed that two paths of
different lengths in spacetime which start and end at same events,
have the same accelerations, except Brent in his diagram? AG/
*In a word, yes. Two worldlines between the same events in spacetime
can have different lengths even if both involve acceleration. And
proper time is the length of your world line. But of course if they
have identical acceleration histories then they are in the same
worldline, not a different one.*
Except of course when they had different initial velocities or positions.
Brent
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*John K Clark See what's on my new list at Extropolis
<https://groups.google.com/g/extropolis>*
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wre
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