Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Thermo Field Dynamics and Kinetic Coefficients of a Charged Boson Gas   Thermo Field Dynamics for inhomogeneous systems is generalized to quantum
fields with a continuous single-particle mass spectrum. The modification of the
hamiltonian in states with a local thermal Bogoliubov symmetry is used to
calculate thermal conductivity and diffusion coefficient of pions interacting
with hot, compressed nuclear matter.

10
The categories of this paper are: q-bio
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The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
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The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
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The categories of this paper are: atom-ph
1
The categories of this paper are: cs
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The categories of this paper are: patt-sol
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The categories of this paper are: bayes-an
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The categories of this paper are: gr-qc
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The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph