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SUMMARY:Non-perturbative tails from multifield inflation - Sebastian Cespe
 des - IFT UAM/CSIC
DTSTART:20220314T130000Z
DTEND:20220314T140000Z
UID:TALK168728@talks.cam.ac.uk
CONTACT:Francesco
DESCRIPTION:It is becoming increasingly clear that large but rare fluctuat
 ions of the primordial curvature field\, controlled by the tail of its pro
 bability distribution\, could have dramatic effects on the current structu
 re of the universe —e.g. via primordial black-holes. However\, the use o
 f standard perturbation theory to study the evolution of fluctuations duri
 ng inflation fails in providing a reliable description of how non-linear i
 nteractions induce non-Gaussian tails. In this talk\, we will explain how 
 to use the stochastic inflation formalism to study the non-perturbative ef
 fects from multi-field fluctuations on the statistical properties of the p
 rimordial curvature field. We will start by describing  the effective acti
 on describing multi field fluctuations. Starting from it we will compute t
 he joint probability density function and show that enhanced non- Gaussian
  tails are a generic feature of slow-roll inflation with additional degree
 s of freedom.
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
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