Vilenkin Cosmology Again

From: Spudboy100@aol.com
Date: Wed May 07 2003 - 00:01:50 MDT

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    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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