Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Thermodynamics and Excitations of the Supersymmetric $t-J$ Model   The free energy of the supersymmetric $t-J$ model is expressed in terms of
finite temperature excitations above thermodynamic equilibrium. This reveals
that the free energy has the form of noninteracting fermions with temperature
dependant excitation spectra. We also discuss the ground state and zero
temperature excitations.

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The categories of this paper are: quant-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
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The categories of this paper are: math-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-th
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The categories of this paper are: cs
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The categories of this paper are: dg-ga
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The categories of this paper are: math
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The categories of this paper are: nlin
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The categories of this paper are: adap-org
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The categories of this paper are: patt-sol
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The categories of this paper are: stat
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The categories of this paper are: solv-int