On 11/7/2025 10:01 PM, Alan Grayson wrote:
Well then why did you ask "how can a test particle at rest, move at lightspeed in spacetime,"On Friday, November 7, 2025 at 2:49:12 PM UTC-7 Brent Meeker wrote: On 11/7/2025 12:05 AM, Alan Grayson wrote:*I don't see any daylight between "adjusting its rate" and "judging" how another clock is moving. That aside, you seem to be affirming the TP. AG*"Adjusting its rate" would imply that there was some absolute motion that would tell it how to adjust. *When the ds vector is inclined wrt the time axis, all the test particle has to "know" is how far its velocity differs from rest in spacetime, which we know is relative. *"differs from rest" implies there's some "at rest". The particle in motion has many different velocities relative to many other objects. I can't have many different time dilations at once.*This has nothing to do with absolute anything. But I see you ignore the more important issue; namely, how can a test particle at rest, move at lightspeed in spacetime, *No need to answer "How?" since it can't.*Never heard of this??? https://www.reddit.com/r/AskPhysics/comments/1fmpay3/everything_travels_through_spacetime_at_the_speed/ AG*
Brent
*if SR shows it can never reach that speed. And if this is mistaken, it implies that your alleged solutions to the TP is on very shaky ground, because it assumes what has been demonstrated is impossible. A*GYou keep referring to "solution to the Twin Paradox". What /exactly/ /is the problem/ which you think needs a solution. The fact that two twins who travel different paths between the same two events in spacetime measure different path lengths doesn't seem like a problem to me. And it has nothing to do with light speed. Brent --You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/everything-list/ae8b287f-f215-4f3c-b340-abdc55e86c39n%40googlegroups.com <https://groups.google.com/d/msgid/everything-list/ae8b287f-f215-4f3c-b340-abdc55e86c39n%40googlegroups.com?utm_medium=email&utm_source=footer>.
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