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PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:1
UID:UW-Physics-Event-6685
DTSTART:20211109T220000Z
DTEND:20211109T230000Z
DTSTAMP:20260414T190844Z
LAST-MODIFIED:20211107T223858Z
LOCATION:Chamberlin 5280
SUMMARY:Precision Calculation of Inflation Correlators at One Loop\, T
 heory Seminar (High Energy/Cosmology)\, Yiming Zhong\, KICP
DESCRIPTION:We initiate a systematic study of precision calculation of
  the inflation correlators at the 1-loop level\, starting in this pape
 r with bosonic 1-loop bispectrum with chemical-potential enhancement. 
 Such 1-loop processes could lead to important cosmological collider ob
 servables but are notoriously difficult to compute due to the lack of 
 symmetries. We attack the problem from a direct numerical approach bas
 ed on the real-time Schwinger-Keldysh formalism and show full numerica
 l results for arbitrary kinematics containing both the oscillatory "si
 gnals" and the "backgrounds". Our results show that\, while the non-os
 cillatory part can be one to two orders of magnitude larger\, the osci
 llatory signal can be separated out by applying appropriate high-pass 
 filters. We have also compared the result with analytic estimates typi
 cally adopted in the literature. While the amplitude is comparable\, t
 here is a non-negligible deviation in the frequency of the oscillatory
  part away from the extreme squeezed limit. See arXiv:2109.14635 for m
 ore details.
URL:https://www.physics.wisc.edu/events/?id=6685
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