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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:1
UID:UW-Physics-Event-6862
DTSTART:20220225T190000Z
DURATION:PT1H0M0S
DTSTAMP:20260414T144330Z
LAST-MODIFIED:20220224T151755Z
LOCATION:Chamberlin 5280
SUMMARY:Underdamped Axionic Blue Isocurvature Perturbations\, Theory S
 eminar (High Energy/Cosmology)\, Sai Chaitanya Tadepalli\, UW Madison
DESCRIPTION:Previous computations of strongly blue tilted axionic isoc
 urvature spectra were computed in the parametric region in which the l
 ightest time-dependent mass is smaller than the Hubble expansion rate 
 during inflation\, leading to an overdamped time evolution. In this ta
 lk\, we present the strongly blue tilted axionic isocurvature spectrum
  in an underdamped time evolution parametric regime. Somewhat surprisi
 ngly\, there exist parametric regions with a strong resonant spectral 
 behavior that leads to rich isocurvature spectral shapes and large amp
 litude enhancements. We focus on computing this resonant spectrum anal
 ytically 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 effectiv
 e potential obtained by integrating out high-frequency fluctuations\, 
 and a piecewise mass-model. 
URL:https://www.physics.wisc.edu/events/?id=6862
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