Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Role of Various Entropies in the Black Hole Information Loss Problem   In a recent paper Hawking has argued that there is no information loss in
black holes in asymptotically AdS spacetimes. We remind that there are several
types of information (entropy) in statistical physics -- fine grained
(microscopic) and coarse grained (macroscopic) ones which behave differently
under unitary evolution. We suggest that the coarse grained information of the
rest of the Universe is lost while fine grained information is preserved. A
possibility to develop in quantum gravity an analogue of the Bogoliubov
derivation of the irreversible Boltzmann and Navier - Stokes equations from the
reversible mechanical equations is discussed.

25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
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
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph