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SUMMARY:“Soft de Sitter Effective Theory” by Timothy Cohen
DTSTART:20230515T140000
DTEND:20230515T150000
DTSTAMP:20260510T180632Z
UID:a546d4adf778a92f1a83bdacffa4ad7da416b5737715ada3df623bfe
CATEGORIES:Conferences - Seminars
DESCRIPTION:Tim Cohen\nIn this talk\, I will introduce the Soft de Sitter 
 Effective Theory (SdSET)\, whose purpose is to model the long wavelength d
 ynamics of quantum fluctuations beyond the horizon.  After providing some
  conceptual and technical issues that motivate the need for a new EFT appr
 oach\, I will explain how we identify the propagating low energy degrees o
 f freedom\, along with their scaling under a power counting scheme and the
 ir 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 stochas
 tic initial conditions.  Finally\, I will show how this framework can be 
 applied to a number of physically interesting problems: massive scalar fie
 lds in dS\, light scalar fields and stochastic inflation\, and the conserv
 ation of the inflationary adiabatic modes.  
LOCATION:BSP 727 https://plan.epfl.ch/?room==BSP%20727 https://epfl.zoom.u
 s/j/69362612859
STATUS:CONFIRMED
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