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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:2
UID:UW-Physics-Event-9351
DTSTART:20251027T180000Z
DTEND:20251027T193000Z
DTSTAMP:20260413T102736Z
LAST-MODIFIED:20251028T001051Z
LOCATION:Chamberlin 5280
SUMMARY:Taming Axion Rotation: Dark Vector-like Confinement for Axioge
 nesis\, Theory Seminar (High Energy/Cosmology)\, Pouya Asadi\, UC\, Sa
 nta Cruz
DESCRIPTION:I show that extending the Standard Model with two axions a
 nd a dark vector-like confining gauge group can simultaneously account
  for both the observed dark matter abundance and the baryon asymmetry 
 of the Universe - a step toward resolving the matter coincidence probl
 em. Starting from a review of sphaleron dynamics\, I derive both (i) t
 he axion-induced contributions to fermion asymmetries and (ii) the bac
 k-reaction of these fermion asymmetries on axion-like fields\, which m
 anifests as a friction on the axions. This analysis clarifies why the 
 minimal axiogenesis scenario cannot produce the correct dark matter an
 d baryon abundances simultaneously. We then show that introducing a se
 cond axion and an additional vector-like dark confining sector - a nat
 ural infrared realization in the well-motivated axiverse frameworks - 
 resolves this tension by providing a distinct source of friction in th
 e axion dynamics. Finally\, we discuss possible UV completions of this
  setup in extra-dimensional models of high-quality axions. Beyond its 
 cosmological implications\, this framework motivates searches for the 
 QCD axion and predicts complementary Light-Shining-through-Wall signat
 ures probing the second axion in the ~eV mass range. Event recording: 
 https://youtu.be/zQ7N9XBPlHQ
URL:https://www.physics.wisc.edu/events/?id=9351
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