The Big Rip is the opposite of the big bang in the sense of being the end of our universe as we know it. Yet the Big Rip is essentially just another Big Bang. Hence this is the appropriate forum for its discussion if there is any interest

Richard





Dark energy, wormholes, and the Big Rip
Authors: Valerio Faraoni, Werner Israel
Comments: 15 pages, LaTeX, to appear in Phys. Rev. D

The time evolution of a wormhole in a Friedmann universe approaching the Big Rip is studied. The wormhole is modeled by a thin spherical shell accreting the superquintessence fluid - two different models are presented. Contrary to recent claims that the wormhole overtakes the expansion of the universe and engulfs it before the Big Rip is reached, it is found that the wormhole becomes asymptotically comoving with the cosmic fluid and the future evolution of the universe is fully causal.
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Link: http://arxiv.org/abs/gr-qc/0503005