Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Second-order Hydrodynamics in Next-to-Leading-Order QCD   We compute the hydrodynamic relaxation times $\tau_\pi$ and $\tau_j$ for hot
QCD at next-to-leading order in the coupling with kinetic theory. We show that
certain dimensionless ratios of second-order to first-order transport
coefficients obey bounds which apply whenever a kinetic theory description is
possible; the computed values lie somewhat above these bounds. Strongly coupled
theories with holographic duals strongly violate these bounds, highlighting
their distance from a quasiparticle description.

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The categories of this paper are: nlin
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The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
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The categories of this paper are: patt-sol
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The categories of this paper are: math-ph
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The categories of this paper are: stat
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The categories of this paper are: nucl-ex
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The categories of this paper are: atom-ph
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The categories of this paper are: quant-ph
3
The categories of this paper are: physics
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The categories of this paper are: eess
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The categories of this paper are: cs