From: Spudboy100@aol.com
Date: Wed May 07 2003 - 00:01:50 MDT
http://xxx.tau.ac.il/list/gr-qc/new
gr-qc/0305025
Title: Creation of massive particles in a tunneling universe
Authors: Jooyoo Hong, Alexander Vilenkin, Serge Winitzki
Comments: 32 pages, 1 figure
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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