Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On 4D-Hawing Radiation from Effective Action   We determine the $s$-waves contribution of a scalar field to the four
dimensional effective action for arbitrary spherically symmetric external
gravitational fields. The result is applied to $4d$-black holes and it is shown
that the energy momentum tensor derived from the (nonlocal) effective action
contains the Hawking radiation. The luminosity is close to the expected one in
the $s$-channel. The energy momentum tensor may be used as starting point to
study the backreaction problem.

1
The categories of this paper are: cs
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph