Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hawking-like radiation from evolving black holes and compact horizonless
  objects   Usually, Hawking radiation is derived assuming (i) that a future eternal
event horizon forms, and (ii) that the subsequent exterior geometry is static.
However, one may be interested in either considering quasi-black holes (objects
in an ever-lasting state of approach to horizon formation, but never quite
forming one), where (i) fails, or, following the evolution of a black hole
during evaporation, where (ii) fails. We shall verify that as long as one has
an approximately exponential relation between the affine parameters on the null
generators of past and future null infinity, then subject to a suitable
adiabatic condition being satisfied, a Planck-distributed flux of Hawking-like
radiation will occur. This happens both for the case of an evaporating black
hole, as well as for the more dramatic case of a collapsing object for which no
horizon has yet formed (or even will ever form). In this article we shall cast
the previous statement in a more precise and quantitative form, and
subsequently provide several explicit calculations to show how the
time-dependent Bogoliubov coefficients can be calculated.

24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org