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SUMMARY:A Cosmic Microscope for the Preheating Era - Jiji Fan\, Brown Univ
 ersity 
DTSTART:20200611T130000Z
DTEND:20200611T140000Z
UID:TALK141853@talks.cam.ac.uk
CONTACT:Francesca Chadha-Day
DESCRIPTION:Light fields with spatially varying backgrounds can modulate c
 osmic preheating\, and imprint the nonlinear effects of preheating dynamic
 s at tiny scales on large scale fluctuations. This provides us a unique pr
 obe into the preheating era which we dub the "cosmic microscope.'' We iden
 tify a distinctive effect of preheating on scalar perturbations that turns
  the Gaussian primordial fluctuations of a light scalar field into square 
 waves\, like a diode. The effect manifests itself as local non-Gaussianity
 . We present a model\, "modulated partial preheating\," where this nonline
 ar effect is consistent with current observations and can be reached by ne
 ar future cosmic probes.
LOCATION:ONLINE - Details to be sent by email
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