Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Thermodynamics of Integrable Chains with Alternating Spins   We consider a two-parameter $(\bar c, \tilde c)$ family of quantum integrable
Hamiltonians for a chain of alternating spins of spin $s=1/2$ and $s=1$. We
determine the thermodynamics for low-temperature $T$ and small external
magnetic field $H$, with $T << H$. In the antiferromagnetic $(\bar c > 0,
\tilde c > 0)$ case, the model has two gapless excitations. In particular, for
$\bar c = \tilde c$, the model is conformally invariant and has central charge
$c_{vir} = 2$. When one of these parameters is zero, the Bethe Ansatz equations
admit an infinite number of solutions with lowest energy.

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The categories of this paper are: gr-qc
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The categories of this paper are: comp-gas
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: physics
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The categories of this paper are: atom-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: q-bio
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The categories of this paper are: adap-org
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The categories of this paper are: plasm-ph
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The categories of this paper are: math-ph
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The categories of this paper are: econ
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The categories of this paper are: stat
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The categories of this paper are: nucl-th
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The categories of this paper are: solv-int