Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Novel picture of the soft modes at the QCD critical point based on the
  FRG method   We investigate the soft mode at the QCD critical point (CP) on the basis of
the functional renormalization group. We calculate the spectral functions in
the meson channels in the two-flavor quark--meson model. Our result shows that
the energy of the peak position of the particle--hole mode in the sigma channel
becomes vanishingly small as the system approaches the QCD CP, which is a
manifestation of the softening of the phonon mode. We also extract the
dispersion curves of the mesonic and the phonon mode, a hydrodynamic mode which
leads to a finding that the dispersion curve of the sigma-mesonic mode crosses
the light-cone into the space-like momentum region, and then eventually merges
into the phonon mode as the system approaches further close to the CP. This may
suggest that the sigma-mesonic mode forms the soft mode together with the
hydrodynamic mode at the CP.

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The categories of this paper are: math-ph
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The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
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The categories of this paper are: bayes-an
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The categories of this paper are: stat
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The categories of this paper are: dg-ga
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The categories of this paper are: patt-sol
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The categories of this paper are: funct-an
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The categories of this paper are: supr-con
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The categories of this paper are: eess
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The categories of this paper are: econ
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The categories of this paper are: astro-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-th
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The categories of this paper are: q-bio