Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Black Holes and Nonperturbative Canonical 2D Dilaton Gravity   We investigate nonperturbative canonical quantization of two dimensional
dilaton gravity theories with an emphasis on the CGHS model. We use an approach
where a canonical transformation is constructed such that the constraints take
a quadratic form. The required canonical transformation is obtained by using a
method based on the B\"acklund transformation from the Liouville theory. We
quantize dilaton gravity in terms of the new variables, where it takes a form
of a bosonic string theory with background charges. Unitarity is then
established by going into a light-cone gauge. As a direct consequence, black
holes in this theory do not violate unitarity, and there is no information
loss. We argue that the information escapes during the evaporation process. We
also discuss the implications of this quantization scheme for the quantum fate
of real black holes. The main conclusion is that black holes do not have to
violate quantum mechanics.

6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics
2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex