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SUMMARY:“Soft de Sitter Effective Theory” by Timothy Cohen
DTSTART:20230227T140000
DTEND:20230227T150000
DTSTAMP:20260510T054616Z
UID:f63ec1abc82a9943d4adab464dd1ee4dd12eff121cecd7ab691f6b21
CATEGORIES:Conferences - Seminars
DESCRIPTION:Timothy Cohen\nIn this talk\, I will introduce the Soft de Sit
 ter Effective Theory (SdSET)\, whose purpose is to model the long waveleng
 th dynamics of quantum fluctuations beyond the horizon.  After providing 
 some conceptual and technical issues that motivate the need for a new EFT 
 approach\, I will explain how we identify the propagating low energy degre
 es of freedom\, along with their scaling under a power counting scheme and
  their transformation properties under the symmetries that persist to the 
 IR.  I will sketch how to derive  the SdSET action\, and will argue that
  it can be expressed as an expansion in local operators\, augmented by sto
 chastic initial conditions.  Finally\, I will show how this framework can
  be applied to a number of physically interesting problems: massive scalar
  fields in dS\, light scalar fields and stochastic inflation\, and the con
 servation of the inflationary adiabatic modes.  
LOCATION:BSP727 https://epfl.zoom.us/j/69362612859
STATUS:CANCELLED
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