Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Rolling Tachyons in String Cosmology   We study the role of rolling tachyons in the cosmological model with
dilatonic gravity. In the string frame, flat space solutions of both
initial-stage and late-time are obtained in closed form. In the Einstein frame,
we show that every expanding solution is decelerating.

22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin