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Dec
19
awarded  Teacher
Oct
22
answered Does a photon in vacuum have a rest frame?
Oct
13
answered What's the relation between virtual photons and electromagnetic potentials?
Aug
31
comment Orientability of spacetime
@Jerry, according to your analogy, it occurred to me that space, rather than time, is non-orientable... In the example of the Mobius strip, the "one-directioness" is perpendicular to the strip itself. Hence, it seems that for any scheme in which spacetime is foliated into space-like slices, the "one-directioness" of time (perpendicular to these slices) implies non-orientability of space... Isn't it?
Aug
31
awarded  Student
Aug
31
comment Orientability of spacetime
This is the point which is not clear to me: Does the fact that time points always towards the future has no relevance whatsoever to its orientability?
Aug
31
asked Orientability of spacetime