On Thu, Feb 13, 2014 at 3:29 PM, LizR <lizj...@gmail.com> wrote: > On 14 February 2014 06:55, Edgar L. Owen <edgaro...@att.net> wrote: > >> Jesse, >> >> See my proximate response to Liz who asked the same question. Basically >> relativity theory gives you the equations for both frames for any >> relativistic situation. So all you have to do is do the calculations like >> I've explained to you with nearly a dozen examples. >> >> That doesn't work, I'm afraid, which is why we both asked the question. > Originally you said "you can stop the experiment at any point..." (and > check the clocks of the observers). That implies you mean a *point in > time* - and a point in time which will be simultaneous for all observers. > Hence if you are working within relativity theory you must be referring to > a hyperplane of simultaneity. > > So our question remains unanswered. >
Edgar has also said that if some observers start out with clocks synchronized at a single point in space and time and then move inertially away from one another, he thinks their clocks remain synchronized in p-time. He may not have thought about it in these terms, but this would actually imply a hypersurface of simultaneity shaped like a hyperbola, not like a flat hyperplane, as illustrated in this spacetime diagram showing the surface where different worldlines emanating from a common origin have each aged by 1 unit of elapsed proper time since departing from one another: http://www.pitt.edu/~jdnorton/teaching/HPS_0410/chapters/spacetime/spacetime_Minkowski_detail.png The diagram is from the very bottom of the page at http://www.pitt.edu/~jdnorton/teaching/HPS_0410/chapters/spacetime/ which is a good discussion of spacetime geometry overall. Jesse -- 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 everything-list+unsubscr...@googlegroups.com. To post to this group, send email to everything-list@googlegroups.com. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/groups/opt_out.
