Quantum-mechanical Lorentzian wormholes in cosmological backgrounds

David Hochberg
Phys. Rev. D 52, 6846 – Published 15 December 1995
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Abstract

We present a minisuperspace analysis of a class of Lorentzian wormholes that evolves quantum mechanically in a background Friedman-Robertson-Walker spacetime. The quantum-mechanical wave function for these wormholes is obtained by solving the Wheeler-DeWitt equation for Einstein gravity on this minisuperspace. The time-dependent expectation value of the wormhole throat radius is calculated to lowest order in an adiabatic expansion of the Wheeler-DeWitt Hamiltonian. For a radiation-dominated expansion, the radius is shown to relax asymptotically to obtain a value of order the Planck length while for a de Sitter background the radius is stationary but always larger than the Planck length. These two cases are of particular relevance when considering wormholes in the early universe. © 1995 The American Physical Society.

  • Received 13 July 1995

DOI:https://doi.org/10.1103/PhysRevD.52.6846

©1995 American Physical Society

Authors & Affiliations

David Hochberg

  • Departamento de Física Teórica, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain

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Issue

Vol. 52, Iss. 12 — 15 December 1995

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