Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-abelian expansion of S-matrix elements and non-abelian tachyon DBI
  action   We apply the prescription proposed in hep-th/0307197 for non-abelian
expansion of S-matrix elements, to the S-matrix element of four tachyons and
one gauge field in superstring theory. We show that the leading order terms of
the expansion are in perfect agreement with the non-abelian generalization of
the tachyon DBI action in which the tachyon potential is $V(T)=1+\pi\alpha'
m^2T^2+\frac{1}{2!}(\pi\alpha' m^2T^2)^2+...$ where $m^2=-1/(2\alpha')$ is the
mass of tachyon. This calculation fixes the coefficient of $T^4$ in the
potential without on-shell ambiguity.

12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys