Casimir energy and a cosmological bounce

Details Casimir energy and a cosmological bounce Casimir energy and a cosmological bounce

2005-10-06

arxiv.org/abs/hep-th/0510052v1

Class.Quant.Grav. 23 (2006) 473-484

Physics

High Energy Physics

High Energy Physics - Theory

13 pages, LaTeX, 8 figures

Scientific paper

10.1088/0264-9381/23/2/012

We review different computation methods for the renormalised energy momentum tensor of a quantised scalar field in an Einstein Static Universe. For the extensively studied conformally coupled case we check their equivalence; for different couplings we discuss violation of different energy conditions. In particular, there is a family of masses and couplings which violate the weak and strong energy conditions but do not lead to spacelike propagation. Amongst these cases is that of a minimally coupled massless scalar field with no potential. We also point out a particular coupling for which a massless scalar field has vanishing renormalised energy momentum tensor. We discuss the backreaction problem and in particular the possibility that this Casimir energy could both source a short inflationary epoch and avoid the big bang singularity through a bounce.

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