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SUMMARY:Multipoint Correlators in Multifield Cosmology:  formal structure 
 and applications - Eva Silverstein\, Stanford
DTSTART:20200520T161500Z
DTEND:20200520T171500Z
UID:TALK141649@talks.cam.ac.uk
CONTACT:Francesca Chadha-Day
DESCRIPTION:Connected N-point amplitudes in quantum field theory are enhan
 ced by a factor of N! in appropriate regimes of kinematics and couplings\,
  but the non-perturbative analysis of this for collider physics applicatio
 ns is subtle.  We will start by briefly reviewing this effect and related 
 developments in large-charge sectors of quantum field theory.  We then res
 olve the question in the affirmative for N-point correlation functions of 
 cosmological perturbations in multifield inflation\, and comment on its ap
 plication to primordial non-Gaussianity. We find that they are calculably 
 N!-enhanced using a simple model for the mixing of the field sectors which
  leads to a convolution of their probability distributions. This effect le
 ads to model-dependent but interesting prospects for enhanced observationa
 l sensitivity.  Additional spinoffs include applications to primordial bla
 ck hole production and a new inflationary model with a controlled resummat
 ion of derivative interactions.  
LOCATION:ONLINE - Details to be sent by email
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