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SUMMARY:Dissipative Inflation via Scalar Production - Luca Santoni (APC\, 
 Paris)
DTSTART:20231127T130000Z
DTEND:20231127T140000Z
UID:TALK203779@talks.cam.ac.uk
CONTACT:Dr  Dong-Gang Wang
DESCRIPTION:I will describe a new mechanism that gives rise to dissipation
  during cosmic inflation. In the simplest implementation\, the mechanism r
 equires the presence of a massive scalar field with a softly-broken global
  U(1) symmetry\, along with the inflaton field. Particle production in thi
 s scenario takes place on parametrically sub-horizon scales\, as opposed t
 o the case of dissipation into gauge fields. Consequently\, the backreacti
 on of the produced particles on the inflationary dynamics can be treated i
 n a local manner\, allowing us to compute their effects analytically. I wi
 ll show the parametric dependence of the power spectrum and its deviation 
 from the usual slow-roll expression. I will show that non-Gaussianities ar
 e always sizeable whenever perturbations are generated by the noise induce
 d by dissipation.
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
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