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CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:1
UID:UW-Physics-Event-6865
DTSTART:20220311T190000Z
DURATION:PT1H0M0S
DTSTAMP:20260414T144219Z
LAST-MODIFIED:20220308T222532Z
LOCATION:Chamberlin 5280
SUMMARY:Gravitational Wave Probes of Axion Rotations Responsible for D
 ark Matter and Baryon Asymmetry\, Theory Seminar (High Energy/Cosmolog
 y)\, Raymond Co\, University of Minnesota
DESCRIPTION:We established a paradigm where the (QCD) axion’s novel 
 cosmological evolution\, a rotation in the field space\, gives rise to
  dark matter and the baryon asymmetry. The axion rotations also provid
 e a natural origin for a kination era\, where the total energy density
  is dominated by the kinetic term of the axion field\, preceded by an 
 early era of matter domination. We investigate the effects of this cos
 mological scenario on the spectrum of possible primordial gravitationa
 l waves from inflation or cosmic strings and find that the spectrum fe
 atures a triangular peak. As a result\, future gravitational wave obse
 rvations can probe the viable parameter space of kination\, including 
 regions that produce axion dark matter by the kinetic misalignment mec
 hanism or the baryon asymmetry by axiogenesis. Lastly\, the axion rota
 tion may also source the cosmic perturbations with an observable amoun
 t of non-Gaussianity.
URL:https://www.physics.wisc.edu/events/?id=6865
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