Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Desingularization of the Milne Universe   Resolution of cosmological singularities is an important problem in any full
theory of quantum gravity. The Milne orbifold is a cosmology with a
big-bang/big-crunch singularity, but being a quotient of flat space it holds
potential for resolution in string theory. It is known however, that some
perturbative string amplitudes diverge in the Milne geometry. Here we show that
flat space higher spin theories can effect a simple resolution of the Milne
singularity when one embeds the latter in 2+1 dimensions. We explain how to
reconcile this with the expectation that non-perturbative string effects are
required for resolving Milne. Along the way, we introduce a Grassmann
realization of the \.{I}n\"on\"u-Wigner contraction to export much of the AdS
technology to our flat space computation.

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The categories of this paper are: cond-mat
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The categories of this paper are: chao-dyn
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The categories of this paper are: acc-phys
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The categories of this paper are: patt-sol
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The categories of this paper are: cs
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The categories of this paper are: stat
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The categories of this paper are: ao-sci
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The categories of this paper are: atom-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-alg
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The categories of this paper are: q-fin
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The categories of this paper are: solv-int
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The categories of this paper are: comp-gas
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The categories of this paper are: econ
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The categories of this paper are: nlin
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The categories of this paper are: cmp-lg