Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Creation and detection of vortices in polariton condensates   We investigate theoretically the creation, persistence and detection of
quantized vortices in nonequilibrium polariton condensates within a stochastic
classical field model. The life time of the quantized vortices is shown to
increase with the spatial coherence and to depend on the geometry of the
condensate. The relation with superfluidity in conventional superfluids is
discussed. Three different ways to measure the vorticity of the polariton
condensate are proposed.

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The categories of this paper are: astro-ph
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The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
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The categories of this paper are: math-ph
18
The categories of this paper are: econ
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The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
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The categories of this paper are: cs
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The categories of this paper are: gr-qc
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The categories of this paper are: nlin
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The categories of this paper are: nucl-ex
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The categories of this paper are: mtrl-th
2
The categories of this paper are: math