Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lessons of Quantum 2D Dilaton Gravity   Based on the analysis of two dimensional dilaton gravity we argue that the
semiclassical equations of black hole formation and evaporation should not be
interpreted in terms of expectation values of operators in the exact quantum
theory, but rather as WKB trajectories. Thus at the semiclassical level it does
not seem possible to formulate a notion of {\it quantum mechanical} information
loss.

23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th