Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 3+1 formulation of non-ideal hydrodynamics   The equations governing dissipative relativistic hydrodynamics are formulated
within the 3+1 approach for arbitrary spacetimes. Dissipation is accounted for
by applying the theory of extended causal thermodynamics (Israel-Stewart
theory). This description eliminates the causality violating infinite signal
speeds present in the conventional Navier-Stokes equation. As an example we
treat the astrophysically relevant case of stationary and axisymmetric
spacetimes, including the Kerr metric. The equations take a simpler form
whenever the inertia due to the dissipative contributions can be neglected.

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The categories of this paper are: cs
29
The categories of this paper are: funct-an
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The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
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The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: physics
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The categories of this paper are: econ
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-fin
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The categories of this paper are: q-bio
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-th