Particle creation in a tunneling universe

Details Particle creation in a tunneling universe Particle creation in a tunneling universe

2002-10-10

arxiv.org/abs/gr-qc/0210034v1

Phys.Rev. D68 (2003) 023520

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

21 pages, 3 embedded figures, RevTeX4

Scientific paper

10.1103/PhysRevD.68.023520

An expanding closed universe filled with radiation can either recollapse or tunnel to the regime of unbounded expansion, if the cosmological constant is nonzero. We re-examine the question of particle creation during tunneling, with the purpose of resolving a long-standing controversy. Using a perturbative superspace model with a conformally coupled massless scalar field, which is known to give no particle production, we explicitly show that the breakdown of the semiclassical approximation and the ``catastrophic particle production'' claimed earlier in the literature are due to an inappropriate choice of the initial quantum state prior to the tunneling.

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