Creation of massive particles in a tunneling universe

Details Creation of massive particles in a tunneling universe Creation of massive particles in a tunneling universe

2003-05-06

arxiv.org/abs/gr-qc/0305025v1

Phys.Rev.D68:023521,2003

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

32 pages, 1 figure

Scientific paper

10.1103/PhysRevD.68.023521

We examine the particle production during tunneling in quantum cosmology. We consider a minisuperspace model with a massive, conformally coupled scalar field and a uniform radiation background. In this model, we construct a semiclassical wave function describing a small recollapsing universe and a nucleated inflating universe (``tunneling from something''). We find that the quantum states of the scalar field in both the initial and the nucleated universe are close to the adiabatic vacuum, the number of created particles is small, and their backreaction on the metric is negligible. We show that the use of the semiclassical approximation is justified for this wave function. Our results imply that the creation of the universe from nothing can be understood as a limit of tunneling from a small recollapsing universe.

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