Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Response functions of gapped spin systems in high magnetic field   We study the dynamical structure factor of gapped one-dimensional spin
systems in the critical phase in high magnetic field. It is shown that the
presence of a ``condensate'' in the ground state in the high-field phase leads
to interesting signatures in the response functions.

27
The categories of this paper are: comp-gas
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The categories of this paper are: funct-an
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The categories of this paper are: econ
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The categories of this paper are: adap-org
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The categories of this paper are: q-fin
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
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The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg