Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bulk Viscosity of Interacting Hadrons   We show that first approximations to the bulk viscosity $\eta_v$ are
expressible in terms of factors that depend on the sound speed $v_s$, the
enthalpy, and the interaction (elastic and inelastic) cross section. The
explicit dependence of $\eta_v$ on the factor $(\frac 13 - v_s^2)$ is
demonstrated in the Chapman-Enskog approximation as well as the variational and
relaxation time approaches. The interesting feature of bulk viscosity is that
the dominant contributions at a given temperature arise from particles which
are neither extremely nonrelativistic nor extremely relativistic. Numerical
results for a model binary mixture are reported.

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The categories of this paper are: hep-th
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The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
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The categories of this paper are: adap-org
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The categories of this paper are: q-bio
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The categories of this paper are: q-fin
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The categories of this paper are: econ
30
The categories of this paper are: q-alg
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The categories of this paper are: math
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The categories of this paper are: chao-dyn
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The categories of this paper are: stat
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The categories of this paper are: atom-ph
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The categories of this paper are: patt-sol