Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Order-Parameter Correlation Functions in Quantum Critical Phenomena   We investigate the functional form of the order-parameter (two-point)
correlation function in quantum critical phenomena. Contrary to the common
lore, when there is no particle-hole symmetry we find that the equal-time
correlation function at criticality does not display a diverging correlation
length. We illustrate our conclusions by Monte Carlo calculations of the
quantum rotor model in $d=2$ space dimensions

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The categories of this paper are: physics
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The categories of this paper are: astro-ph
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The categories of this paper are: q-bio
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The categories of this paper are: eess
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-lat
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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: atom-ph
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The categories of this paper are: hep-th
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The categories of this paper are: gr-qc
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The categories of this paper are: solv-int
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The categories of this paper are: hep-ph
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The categories of this paper are: cs
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The categories of this paper are: comp-gas
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The categories of this paper are: supr-con