Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: FRW universe in the laboratory   We consider an expanding relativistic fluid with spherical symmetry as a
model for an analog FRW spacetime. In the framework of relativistic acoustic
geometry we demonstrate how to mimic an arbitrary FRW spacetime with positive,
zero or negative spatial curvature. In the Lagrangian description we show that
a particular FRW spacetime is obtained by choosing the appropriate potential.
We discuss several examples and in particular the analog de Sitter spacetime in
the coordinate representation with positive and negative spatial curvature.

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The categories of this paper are: hep-ex
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The categories of this paper are: quant-ph
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The categories of this paper are: math-ph
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The categories of this paper are: stat
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The categories of this paper are: cond-mat
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The categories of this paper are: acc-phys
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The categories of this paper are: physics
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The categories of this paper are: supr-con
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-fin
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The categories of this paper are: comp-gas
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The categories of this paper are: cs
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The categories of this paper are: q-alg
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The categories of this paper are: plasm-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: nlin