Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Self-similar accretion in thin disks around near-extremal black holes   Near-maximally spinning black holes display conformal symmetry in their
near-horizon region, which is therefore the locus of critical phenomena. In
this paper, we revisit the Novikov-Thorne accretion thin disk model and find a
new self-similar radiation-dominated solution in the extremely high spin
regime. Motivated by the self-consistency of the model, we require that matter
flows at the sound speed at the innermost stable circular orbit (ISCO). We
observe that, when the disk pressure is dominated by radiation at the ISCO,
which occurs for the best-fitting Novikov-Thorne model of GRS 1915+105, the
Shakura-Sunyaev viscosity parameter can be expressed in terms of the spin, mass
accretion rate and radiative efficiency. We quantitatively describe how the
exact thin disk solution approaches the self-similar solution in the vicinity
of the ISCO and for increasing spins.

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The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
23
The categories of this paper are: solv-int
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga