Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gravitation, Thermodynamics, and Quantum Theory   During the past 30 years, research in general relativity has brought to light
strong hints of a very deep and fundamental relationship between gravitation,
thermodynamics, and quantum theory. The most striking indication of such a
relationship comes from black hole thermodynamics, where it appears that
certain laws of black hole mechanics are, in fact, simply the ordinary laws of
thermodynamics applied to a system containing a black hole. This article will
review the present status of black hole thermodynamics and will discuss some of
the related unresolved issues concerning gravitation, thermodynamics, and
quantum theory.

32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org