Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spectral properties of massless and massive quarks coupled with massive
  boson at finite temperature   We study the properties of massless and massive quarks coupled with a scalar
and pseudoscalar boson at finite temperature in Yukawa models at the one-loop
order. The behavior of the spectral function and the pole structure of the
propagator are analyzed as functions of temperature $T$ and the quark mass
$m_f$. It is shown that the three-peak structure of the spectral function found
in a previous work for massless quarks is formed at temperatures comparable to
the boson mass even for finite $m_f$, but gradually ceases to exist as $m_f$
becomes larger. We identify the three poles of the quark propagator
corresponding to the collective excitations of the quark in the complex energy
plane. It is shown that the three trajectories made by the poles along with a
variation of $T$ undergo a structural rearrangement at a critical quark mass
when $m_f$ is increased. This suggests that the physics content of the
collective quark excitations is changed in a drastic way at this point. The
results are nicely accounted for with the notion of the level mixing induced by
a resonant scattering of the massive boson with quarks and holes of thermally
excited anti-quarks.

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The categories of this paper are: physics
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
19
The categories of this paper are: eess
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The categories of this paper are: nlin
10
The categories of this paper are: q-bio