Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Transport Coefficients of Bulk Viscous Pressure in the 14-moment
  approximation   We compute the transport coefficients that appear in the fluid-dynamical
equations for the bulk viscous pressure and shear-stress tensor using the
14-moment approximation in the limit of small, but finite, masses. In this
limit, we are able to express all these coefficients in terms of known
thermodynamic quantities, such as the thermodynamic pressure, energy density,
and the velocity of sound. We explicitly demonstrate that the ratio of bulk
viscosity to bulk relaxation time behaves very differently, as a function of
temperature, than the ratio of shear viscosity to shear relaxation time. We
further explicitly compute, for the first time, the transport coefficients that
couple the bulk viscous pressure to the shear-stress tensor and vice versa. The
coefficient that couples bulk viscous pressure to shear-stress tensor is found
to be orders of magnitude larger than the bulk viscosity itself, suggesting
that bulk viscous pressure production owes more to this coupling than to the
expansion rate of the system.

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The categories of this paper are: physics
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The categories of this paper are: q-alg
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
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The categories of this paper are: nlin
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The categories of this paper are: gr-qc
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The categories of this paper are: acc-phys
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The categories of this paper are: quant-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: mtrl-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-th
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The categories of this paper are: astro-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: bayes-an
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The categories of this paper are: comp-gas