Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nature of chiral phase transition in QED$_3$ at zero density   Based on the feature of chiral susceptibility and thermal susceptibility at
finite temperature, the nature of chiral phase transition around the critical
number of fermion flavors ($N_c$) and the critical temperature ($T_c$) at a
fixed fermion flavors number in massless QED$_3$ are investigated. It is showed
that, at finite temperature the system exhibits a second-order phase transition
at $N_c$ or $T_c$ and each of the estimated critical exponents is less than 1,
while it reveals a higher-order continuous phase transition around $N_c$ at
zero temperature.

33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
5
The categories of this paper are: gr-qc
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The categories of this paper are: bayes-an
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The categories of this paper are: alg-geom
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The categories of this paper are: adap-org
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The categories of this paper are: comp-gas
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The categories of this paper are: solv-int
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The categories of this paper are: acc-phys
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The categories of this paper are: funct-an
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
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The categories of this paper are: chem-ph