Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: String Gas Cosmology and Structure Formation   It has recently been shown that a Hagedorn phase of string gas cosmology may
provide a causal mechanism for generating a nearly scale-invariant spectrum of
scalar metric fluctuations, without the need for an intervening period of de
Sitter expansion. A distinctive signature of this structure formation scenario
would be a slight blue tilt of the spectrum of gravitational waves. In this
paper we give more details of the computations leading to these results.

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The categories of this paper are: chem-ph
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys