Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Entropy of a Rindler Observer   We compute the entropy of a Rindler particle-detector (observer) in the
presence of a quantum field in the Minkowski vacuum state; due to the Unruh
effect, the observer is immersed in a thermal bath at a temperature
proportional to its proper acceleration.

20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
2
The categories of this paper are: math