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IPM
30
YEARS OLD

“School of Physics”

Paper   IPM / P / 11356
   School of Physics
  Title: Brane Annihilations during Inflation
  Author(s):
1 . D . Battefeld
2 . T. Battefeld
3 . H. Firouzjahi
4 . N. Khosravi
  Status: Published
  Journal: JCAP
  Vol.: 07
  Year: 2010
  Pages: 009
  Supported by: IPM
  Abstract:
We investigate brane in ation driven by two stacks of mobile branes in a throat. The stack closest to the bottom of the throat annihilates first with anti-branes, 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- eld in ation, 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, a ecting the power-spectrum of curvature perturbations. We nd 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 infation.

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