<< November 2021 >>
 
 >>
 >>
 >>
 >>
 >>
Sun Mon Tue Wed Thu Fri Sat
   1   2   3   4   5   6 
 7   8   9   10   11   12   13 
 14   15   16   17   18   19   20 
 21   22   23   24   25   26   27 
 28   29   30   
 
Add an Event Edit This Event

Theory Seminar (High Energy/Cosmology)

<< Summer 2021 Fall 2021 Spring 2022 >>
Subscribe to receive email announcements of events
Precision Calculation of Inflation Correlators at One Loop
Date: Tuesday, November 9th
Time: 4:00 pm
Place: Chamberlin 5280
Speaker: Yiming Zhong, KICP
Abstract: We initiate a systematic study of precision calculation of the inflation correlators at the 1-loop level, starting in this paper with bosonic 1-loop bispectrum with chemical-potential enhancement. Such 1-loop processes could lead to important cosmological collider observables but are notoriously difficult to compute due to the lack of symmetries. We attack the problem from a direct numerical approach based on the real-time Schwinger-Keldysh formalism and show full numerical results for arbitrary kinematics containing both the oscillatory "signals" and the "backgrounds". Our results show that, while the non-oscillatory part can be one to two orders of magnitude larger, the oscillatory signal can be separated out by applying appropriate high-pass filters. We have also compared the result with analytic estimates typically adopted in the literature. While the amplitude is comparable, there is a non-negligible deviation in the frequency of the oscillatory part away from the extreme squeezed limit. See arXiv:2109.14635 for more details.
Host: Lars Aalsma
Add this event to your calendar

©2013 Board of Regents of the University of Wisconsin System