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SUMMARY:Sidetracked Inflation - Sebastian Garcia-Saenz (IAP)
DTSTART:20190121T130000Z
DTEND:20190121T140000Z
UID:TALK117385@talks.cam.ac.uk
CONTACT:Sadra Jazayeri
DESCRIPTION:Heavy scalar fields can undergo an instability during inflatio
 n as a result of their kinetic coupling with the inflaton. This effect is 
 known as the geometrical destabilization of inflation\, as it is caused by
  the curvature of the internal manifold parametrized by the fields. The in
 stability can drive the system away from its original path in field space 
 into a new inflationary attractor\, a scenario that we call “sidetracked
  inflation”. This talk will aim at describing the physics of this second
  phase and its observable consequences. I will show that the behavior of c
 osmological fluctuations can be understood by means of a single-field effe
 ctive theory in which perturbations propagate with either a modified dispe
 rsion relation\, a reduced speed of sound\, or a speed of sound that is im
 aginary. The latter case is especially interesting as it leads to novel ob
 servational signatures\, and in particular to unusual shapes in the non-Ga
 ussianities
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
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