Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Polish doughnuts revisited I. The angular momentum distribution and
  equipressure surfaces   We construct a new family of analytic models of black hole accretion disks in
dynamical equilibria. Our construction is based on assuming distributions of
angular momentum and entropy. For a particular choice of the distribution of
angular momentum, we calculate the shapes of equipressure surfaces. The
equipressure surfaces we find are similar to those in thick, slim and thin
disks, and to those in ADAFs.

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The categories of this paper are: physics
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-ex
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The categories of this paper are: nucl-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: mtrl-th
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The categories of this paper are: alg-geom
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-lat
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The categories of this paper are: eess