Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Critical temperature for the two-dimensional attractive Hubbard Model   The critical temperature for the attractive Hubbard model on a square lattice
is determined from the analysis of two independent quantities, the helicity
modulus, $\rho_s$, and the pairing correlation function, $P_s$. These
quantities have been calculated through Quantum Monte Carlo simulations for
lattices up to $18\times 18$, and for several densities, in the
intermediate-coupling regime. Imposing the universal-jump condition for an
accurately calculated $\rho_s$, together with thorough finite-size scaling
analyses (in the spirit of the phenomenological renormalization group) of
$P_s$, suggests that $T_c$ is considerably higher than hitherto assumed.

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The categories of this paper are: funct-an
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The categories of this paper are: alg-geom
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The categories of this paper are: q-bio
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The categories of this paper are: astro-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: physics
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The categories of this paper are: hep-th
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
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The categories of this paper are: stat
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The categories of this paper are: chem-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: chao-dyn
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The categories of this paper are: cmp-lg
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-ex