Nariai--Bertotti--Robinson spacetimes as a building material for one-way wormholes with horizons, but without singularity
arXiv:0707.3193 · doi:10.1142/9789812834300_0355
Abstract
We discuss the problem of wormholes from the viewpoint of gluing together two Reissner--Nordström-type universes while putting between them a segment of the Nariai-type world (in both cases there are also present electromagnetic fields as well as the cosmological constant). Such a toy wormhole represents an example of one-way topological communication free from causal paradoxes, though involving a travel to next spacetime sheet since one has to cross at least a pair of horizons through which the spacetimes' junction occurs. We also consider the use of thin shells in these constructions. Such a ``material'' for wormholes we choose taking into account specific properties of the Nariai--Bertotti--Robinson spacetimes.
arXiv comment5 pages, a talk delivered at the 11th Marcel Grossmann Meeting (2006)