Post date: Mar 9, 2014 3:49:44 PM
"Why photon is purely temporal being"?
A photon does not have its own rest frame.Then from STR point of view, one may show that's the spatial extension of photon vanishes. Thus photon is a purely temporal being. It means that photon exists only in time. In general one may say that energy does exist only in time.
9th March 2014