Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: String field theory in curved spacetime and the resolution of spacelike
  singularities   We attempt to understand the fate of spacelike gravitational singularities in
string theory via the quantum stress tensor for string matter in a fixed
background. We first approximate the singularity with a homogeneous anisotropic
background and review the minisuperspace equations describing the evolution of
the scale factors and the dilaton. We then review and discuss the behavior of
large strings in such models. In a simple model which expands isotropically for
a finite period of time we compute the number density of strings produced by
quantum pair production and find that this number, and thus the stress tensor,
becomes infinite when the Hubble volume of the expansion exceeds the string
scale, in a manner reminiscent of the Hagedorn transition. Based on this
calculation we argue that either the region near the singularity undergoes a
phase transition when the density reaches the order of a string mass per string
volume, or that the backreaction of the produced string matter dramatically
modifies the geometry.

11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas