Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nonlinear polaritons in Bose-Einstein condensates in optical lattices   We study the interaction of a Bose-Einstein condensate in an optical lattice
with additional electromagnetic fields under Raman resonance condition. System
of evolution equations describing ultra-short optical pulse propagation and
photo-induced transport of cold atoms in optical lattice is derived. The steady
state solution of these equations was found. There are new kinds of polaritonic
solitary waves propagating.

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The categories of this paper are: hep-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-th
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The categories of this paper are: nucl-th
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The categories of this paper are: astro-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: adap-org
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-ex
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The categories of this paper are: cond-mat
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The categories of this paper are: q-fin
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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: math
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The categories of this paper are: funct-an