Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2007-07-21
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
5 pages, a talk delivered at the 11th Marcel Grossmann Meeting (2006)
Scientific paper
We discuss the problem of wormholes from the viewpoint of gluing together two Reissner--Nordstr\"om-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.
Medina Guevara Maria G.
Mitskievich Nikolai V.
Rodriguez Hector Vargas
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