Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Casimir energy and a cosmological bounce   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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The categories of this paper are: acc-phys
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The categories of this paper are: adap-org
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The categories of this paper are: atom-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-lat
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The categories of this paper are: q-fin
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The categories of this paper are: plasm-ph
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The categories of this paper are: math
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The categories of this paper are: q-bio
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The categories of this paper are: chem-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-ex
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The categories of this paper are: cond-mat