Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hagedorn Inflation: Open Strings on Branes Can Drive Inflation   We demonstrate an inflationary solution to the cosmological horizon problem
during the Hagedorn regime in the early universe. Here the observable universe
is confined to three spatial dimensions (a three-brane) embedded in higher
dimensions. The only ingredients required are open strings on D-branes at
temperatures close to the string scale. No potential is required. Winding modes
of the strings provide a negative pressure that can drive inflation of our
observable universe. Hence the mere existence of open strings on branes in the
early hot phase of the universe drives Hagedorn inflation, which can be either
power law or exponential. We note the amusing fact that, in the case of
stationary extra dimensions, inflationary expansion takes place only for branes
of three or less dimensions.

33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph