Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A note on the singularity theorem for supergravity SD-branes   Recently, a singularity theorem for full SD-brane spacetimes was given in
hep-th/0305055. We comment on the relation between this and previous work as
well as provide a more geometric formulation interpreted as a no-go theorem. We
then point out that some setups of physical interest escape the theorem:
cosmological applications, half-SDp-branes and decaying unstable Dp-branes for
general p. We also provide indications that the space-filling full SD8-brane
(in d=10) escapes as well, because of the important role of Ramond-Ramond
fields. In any case, tachyon cosmology is not ruled out by the no-go theorem.
Lastly, we remark upon interesting directions for potential generalizations of
the theorem, and quantum corrections.

19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org