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Paper   IPM / P / 11356
School of Physics
  Title:   Brane Annihilations during Inflation
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
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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