Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Note on Brane Inflation   This short note emphasises a potential tension between string models of
inflation based on systems of branes and antibranes and the spectrum of strings
in curved space, in particular the requirement that the leading Regge
trajectory extends to the Planck scale allowing for the conventional string
theory UV completion of gravity.

31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph