Brent, First thanks for your comment.
I think Jesse and I are both aware of that, but we are considering the age relationship JUST BETWEEN A and B and so must consider only how they see it in their OWN frames, not the view of a 3rd observer of that relationship. Though Jesse would probably disagree. The current discussion is about choice of frames though. Check my latest post for a synopsis of one case.. Edgar On Tuesday, March 4, 2014 2:56:49 PM UTC-5, Brent wrote: > > On 3/4/2014 11:19 AM, Jesse Mazer wrote: > > > On Tue, Mar 4, 2014 at 2:02 PM, Edgar L. Owen <[email protected]<javascript:> > > wrote: > >> Jesse, >> >> You ask me to choose between 1. and 2. >> >> 1. If B's proper age at this point in spacetime is T, then C's proper >> age at this point in spacetime must be T as well (i.e. their proper ages >> are "simultaneous" in the sense that they must reach the same age >> simultaneously). >> >> 2. If B and C's worldlines both pass through a specific point in >> spacetime P, and B's age is T1 when she passes through P, while C's age is >> T2 when she passes through P, then B must be at age T1 simultaneously with >> C being at age T2 (i.e. whatever two specific ages they have at P, they >> must reach those two ages simultaneously, even if the two ages are >> different) >> >> >> First I assume that by "passing through the same point in spacetime" >> you mean that the worldlines cross at P simultaneously by the operational >> definition of no light delay. >> >> 1. is true only in a SYMMETRIC case. In the symmetric case they would >> have the same ages as they pass through the same point P, but in that case >> they have the same ages during the WHOLE trip so no big surprise. >> > > This isn't true. In the inertial frame of a third party passing by, B and > C age at different rates in different segments of their world lines even > though those rates integrate to the same total aging between their two > meetings. > > 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 post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/groups/opt_out.
