Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Backreaction and the rolling tachyon -- an effective action point of
  view   We compute the decay of an unstable D9 brane in type IIA string theory
including backreaction effects using an effective field theory approach. The
open string tachyon on the brane is coupled consistently to the space-time
metric, the dilaton and the RR 9-form. The purpose of this note is to address
the fate of the open string energy density, which remains constant if no
interaction with the closed string modes is included. Our computations show
that taking only into account the coupling to the massless closed strings the
total energy stored in the open string sector vanishes asymptotically,
independently how small one chooses g_s. We find also the large time behaviour
of the fields in the Einstein and string frames.

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The categories of this paper are: q-alg
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The categories of this paper are: plasm-ph
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The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
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The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
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The categories of this paper are: chao-dyn
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The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
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The categories of this paper are: atom-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: stat
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The categories of this paper are: bayes-an