Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Origin of the blackhole information paradox   It is argued that the blackhole information paradox originates from treating
the blackhole geometry as strictly classical. It is further argued that the
theory of quantum fields in a classical curved space with a horizon is an ill
posed problem. If the geometry is allowed to fluctuate quantum mechanically,
then the horizon effectively disappears. The sharp horizon emerges only in the
classical limit when the ratio of the Compton wavelength of the black hole to
its Schwarzschild radius vanishes. The region of strong gravity that develops
when matter collapses to form the blackhole remains visible to the whole of
spacetime and has to be described by a microscopic theory of strong gravity.
The arguments imply that the information paradox is demoted from a paradox
involving fundamental principles of physics to the problem of describing how
matter at the highest densities gravitates.

2
The categories of this paper are: math
16
The categories of this paper are: stat
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn