Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Brane Annihilations during Inflation   We investigate brane inflation driven by two stacks of mobile branes in a
throat. The stack closest to the bottom of the throat annihilates first with
antibranes, resulting in particle production and a change of the equation of
state parameter w. We calculate analytically some observable signatures of the
collision; related decays are common in multi-field inflation, providing the
motivation for this case study. The discontinuity in w enters the matching
conditions relating perturbations in the remaining degree of freedom before and
after the collision, affecting the power-spectrum of curvature perturbations.
We find an oscillatory modulation of the power-spectrum for scales within the
horizon at the time of the collision, and a slightly redder spectrum on
super-horizon scales. We comment on implications for staggered inflation.

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The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
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The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
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The categories of this paper are: patt-sol
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The categories of this paper are: comp-gas
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The categories of this paper are: q-fin
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The categories of this paper are: funct-an