Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin Polarization Formula for Dirac Fermions at Local Equilibrium   We derive a Cooper-Frye type spin polarization formula for Dirac fermions at
local thermal equilibrium described by a grand canonical ensemble specified by
temperature, fluid velocity, chemical potential, and spin potential. We discuss
the physical meaning of different contributions to spin polarization and
compare them with previous works. The present formula provides machinery to
convert the spin potential computed in, e.g., relativistic spin hydrodynamics
to the spin polarization observable in, e.g., heavy-ion collisions.

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The categories of this paper are: alg-geom
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The categories of this paper are: hep-th
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The categories of this paper are: ao-sci
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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: patt-sol
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The categories of this paper are: dg-ga
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The categories of this paper are: plasm-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: funct-an
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The categories of this paper are: astro-ph
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The categories of this paper are: eess
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The categories of this paper are: cs
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The categories of this paper are: q-bio
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The categories of this paper are: stat
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The categories of this paper are: quant-ph