Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On energy for accelerating observers in black hole spacetimes   Quasi-local energies for constantly accelerating observers in Ba\~nados,
Teitelboim, and Zanelli (BTZ), Schwarzschild and Schwarzschild-de Sitter
spacetimes are derived. The energies are expressed in terms of acceleration,
cosmological constant, and area, quantities measurable by the observers. Based
on results from quantum fields in curved spacetime for the redshifted Hawking
temperature, entropy and thermodynamic-like laws are briefly explored in the
three spacetimes.

27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph