Phys. Rev. D 79, 044034 (2009) [10 pages]Cosmological wormholesReceived 12 January 2009; published 26 February 2009 Motivated by the cosmological wormhole solutions obtained from our recent numerical investigations, we provide a definition of a wormhole which applies to dynamical situations. Our numerical solutions do not have timelike trapping horizons but they are wormholes in the sense that they connect two or more asymptotic regions. Although the null energy condition must be violated for static wormholes, we find that it can still be satisfied in the dynamical context. Two analytic solutions for a cosmological wormhole connecting two Friedmann universes without trapping horizons are presented. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.79.044034
DOI:
10.1103/PhysRevD.79.044034
PACS:
04.20.Gz, 04.20.Jb, 04.40.Nr
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