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SEQUENCE:1
UID:UW-Physics-Event-6399
DTSTART:20210402T150000Z
DTEND:20210402T160000Z
DTSTAMP:20260414T231232Z
LAST-MODIFIED:20210331T163507Z
LOCATION:For zoom link\, sign up at: https://groups.google.com/a/g-gro
 ups.wisc.edu/d/forum/theoryseminars/join
SUMMARY:Beyond Lorentz's Lamp-post: Amplitude Techniques for Cosmology
 \, Theory Seminar (High Energy/Cosmology)\, Scott Melville\, Universit
 y of Cambridge
DESCRIPTION:In recent years\, a number of powerful techniques have bee
 n developed for scattering amplitudes\, exploiting fundamental princip
 les like unitarity and causality to place constraints on our effective
  field theories.
\nHowever\, most of this progress has been confined t
 o Lorentz-invariant systems\, and so cannot be applied to cosmology (i
 n which the expanding spacetime background spontaneously breaks Lorent
 z symmetry).
\nIn this talk\, I will describe how we can import these 
 amplitude techniques to systems without Lorentz symmetry\, and in part
 icular how they impact the Effective Field of Theory of inflation\, id
 entifying a region of parameter space in which unitarity/causality gua
 rantees new physics beyond single-field\, weakly coupled inflation.
URL:https://www.physics.wisc.edu/events/?id=6399
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