Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pedagogical notes on black holes, de Sitter space, and bifurcated
  horizons   I discuss black hole evaporation in two different coordinate systems and
argue that the results of the two are compatible once one takes the holographic
principle into account. de Sitter space is then discussed along similar lines.
Finally I make some remarks about smooth initial conditions in GR, which evolve
to space-times with bifurcate horizons, and emphasize the care one must take in
identifying spaces of solutions of General Relativity which belong to the same
quantum theory of gravity. No really new material is presented, but the point
of view I take on all 3 subjects is not widely appreciated.

15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph