Wormholes in spacetimes with cosmological horizons

Details Wormholes in spacetimes with cosmological horizons Wormholes in spacetimes with cosmological horizons

1998-03-08

arxiv.org/abs/gr-qc/9803029v1

Int.J.Mod.Phys. D8 (1999) 325-335

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

10 pages, LaTeX 2.O9, no figures

Scientific paper

10.1142/S0218271899000249

A generalisation of the asymptotic wormhole boundary condition for the case of spacetimes with a cosmological horizon is proposed. In particular, we consider de Sitter spacetime with small cosmological constant. The wave functions selected by this proposal are exponentially damped in WKB approximation when the scale factor is large but still much smaller than the horizon size. In addition, they only include outgoing gravitational modes in the region beyond the horizon. We argue that these wave functions represent quantum wormholes and compute the local effective interactions induced by them in low-energy field theory. These effective interactions differ from those for flat spacetime in terms that explicitly depend on the cosmological constant.

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