<< February 2022 >>
 
 >>
 >>
 >>
 >>
 >>
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   
 
Add an Event Edit This Event

Theory Seminar (High Energy/Cosmology)

<< Fall 2021 Spring 2022 Summer 2022 >>
Subscribe to receive email announcements of events
Underdamped Axionic Blue Isocurvature Perturbations
Date: Friday, February 25th
Time: 1:00 pm
Place: Chamberlin 5280
Speaker: Sai Chaitanya Tadepalli, UW Madison
Abstract: Previous computations of strongly blue tilted axionic isocurvature spectra were computed in the parametric region in which the lightest time-dependent mass is smaller than the Hubble expansion rate during inflation, leading to an overdamped time evolution. In this talk, we present the strongly blue tilted axionic isocurvature spectrum in an underdamped time evolution parametric regime. Somewhat surprisingly, there exist parametric regions with a strong resonant spectral behavior that leads to rich isocurvature spectral shapes and large amplitude enhancements. We focus on computing this resonant spectrum analytically in parametric regions amenable to such computations. Because the spectrum is sensitive to nonperturbative classical field dynamics, we will discuss a wide variety of analytic techniques that are used like decoupling, nonlinear field redefinition, a time-space effective potential obtained by integrating out high-frequency fluctuations, and a piecewise mass-model.
Add this event to your calendar

©2013 Board of Regents of the University of Wisconsin System