[Time travel](http://en.wikipedia.org/wiki/Time_travel) is the concept of moving between different points in time, often instigated by non-trivially topology of space-time, such as, a wormhole. DO NOT USE THIS TAG for e.g. change of coordinate systems, change of time coordinate, or topologically ...
If the universe is infinite, by virtue of chance it means that every possible configuration of matter must exist somewhere (according to this documentary). Therefore, if we accept that the universe ...
Recently, there has been a paper1 (and an accompanying layman-ized white paper2) on "Traversable Achronal Retrograde Domains In Spacetime", TARDIS for short. It proposes a spacetime geometry that ...
I was watching a video on Youtube by Brian Greene, "the illusion of time."http://www.youtube.com/watch?v=j-u1aaltiq4 In that video, he introduces to me the idea of a "brane," or a slice of the ...