Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Quantum Material Model of Static Schwarzschild Black Holes   A quantum-mechanical prescription of static Einstein field equation is
proposed in order to construct the matter-metric eigen-states in the interior
of a static Schwarzschild black hole where the signature of space-time is
chosen as (--++). The spectrum of the quantum states is identified to be the
integral multiples of the surface gravity. A statistical explanation of black
hole entropy is given and a quantisation rule for the masses of Schwarzschild
black holes is proposed.

3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
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The categories of this paper are: hep-ex