Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: "Phantom" Inflation in Warped Compactification   In this paper, in a class of warped compactifications with the brane/flux
annihilation, we find that the inflation may be driven by a flat direction
identified as that along the number p of anti D3-branes located at the tip of
the Klebanov-Strassler throat. The spectrum of adiabatic perturbation generated
during inflation is nearly scale invariant, which may be obtained by using the
results shown in the phantom inflation, since in a four-dimension effective
description the evolution of energy density along the $p$ direction is slowly
increasing.

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The categories of this paper are: ao-sci
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The categories of this paper are: dg-ga
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The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
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The categories of this paper are: q-alg
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The categories of this paper are: supr-con
9
The categories of this paper are: nlin
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The categories of this paper are: bayes-an
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The categories of this paper are: patt-sol
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The categories of this paper are: quant-ph
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The categories of this paper are: adap-org
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The categories of this paper are: chao-dyn
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The categories of this paper are: math-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: econ
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The categories of this paper are: hep-lat