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SUMMARY:Stochastic Effects in Hybrid Inflation - Vincent Vennin\, Institut
 e of Astrophysics\, Paris
DTSTART:20121116T130000Z
DTEND:20121116T140000Z
UID:TALK39861@talks.cam.ac.uk
CONTACT:Xingang Chen
DESCRIPTION:Hybrid inflation is a two-field model where inflation ends due
  to an instability. In the neighborhood of the instability point\, the pot
 ential is very flat and the quantum fluctuations dominate over the classic
 al motion of the inflaton and waterfall fields. These fluctuations even de
 termine around which minimum of the potential inflation is likely to end\,
  so in a sense the classical trajectory itself has a quantum origin. In th
 is talk\, I will study this regime in the framework of stochastic inflatio
 n. After introducing this formalism\, I will show how to numerically solve
  the two coupled Langevin equations controlling the evolution of the field
 s and present some results. I will be mostly in interested in the probabil
 ity distributions of the total number of e-folds and of the inflation exit
  point. I will conclude with discussing the physical consequences of these
  results\, in particular the question of how the quantum diffusion can aff
 ect the observable predictions of hybrid inflation.
LOCATION:Pavilion B Potter Room (B1.19)
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