On Wed, Jan 15, 2014 at 5:39 PM, meekerdb <[email protected]> wrote:
> On 1/15/2014 2:54 PM, Stephen Paul King wrote: > > Dear Edgar, > > I will have to agree with LizR here. SR in fact makes the notion of a > present moment a nonsensical concept, as SR shows how there does not exist, > nay cannot exist any global frame of simultaneity. This prevents the > existence, if SR is correct and good evidence tells us that it is, of any > thing like a global present moment. > > "That dog don't hunt!" > > > But notice that Edgar makes two kinds of arguments: > > First, the local event argument - if two bodies interact it must be at the > same moment (he neglects to to mention that it must also be at the same > place). > > Second, the continuity argument - if two bodies interact at two different > events than at any given time between those two events both bodies exist > and this means that they are existing in the same moment, even though they > are in different places.. > > Curiously, in his online blog about SR he takes the same approach as Lewis > Carrol Epstein in his excellent little book "Relativity Visualized". He > notes that everything is always traveling at the speed of light. If you're > 'standing still' that means you're just traveling in the time direction. > So if you move in the space direction you must give up some speed in the > time direction. Epstein calls this a useful myth and doesn't misused it. > Edgar assumes that 'time direction' is fixed like Newtonian space. > > Brent, In what sense is it a myth? That is one thing I could not figure out from his book. Is it because proper-time is not rightfully a spatial dimension? Or is there some other reason? Thanks, Jason -- 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.
