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SUMMARY:Geometrical destabilization of heavy scalar fields during inflatio
 n - Sebastien Renaux-Petel (IAP Paris)
DTSTART:20160425T120000Z
DTEND:20160425T130000Z
UID:TALK65740@talks.cam.ac.uk
CONTACT:Tommaso Giannantonio
DESCRIPTION:We show the existence of a general mechanism by which heavy sc
 alar fields can be destabilized during inflation. It relies on the fact th
 at the effective mass of fluctuations orthogonal to the inflationary direc
 tion contains a contribution proportional to the curvature tensor of the f
 ield space\nmetric\, and that it can render the entropic fluctuations tach
 yonic. We describe a simple and rather universal setup in which apparently
  benign higher-order operators trigger this instability. This phenomenon c
 an prematurely end inflation and have important observational consequences
 \, sometimes\nexcluding models that would otherwise perfectly fit the data
 . More generally\, it modifies the interpretation of cosmological constrai
 nts in terms of fundamental physics.
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
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