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SEQUENCE:2
UID:UW-Physics-Event-8934
DTSTART:20241009T210000Z
DTEND:20241009T220000Z
DTSTAMP:20260408T073823Z
LAST-MODIFIED:20241203T165715Z
LOCATION:5280 Chamberlin Hall
SUMMARY:Non-Thermal Dark Matter and Cosmological Phase Transitions \, 
 Theory Seminar (High Energy/Cosmology)\, Cash Hauptmann\, University o
 f Nebraska–Lincoln
DESCRIPTION:I will discuss ongoing work concerning cosmological phase 
 transitions (PTs) and their possible roles in the production of dark m
 atter (DM) and primordial black holes (PBHs). For DM\, I have recently
  proposed a non-thermal production mechanism utilizing supercooled fir
 st-order PTs which can enhance the abundance of DM. This enhancement o
 pens the viable DM parameter space to models with higher annihilation 
 cross sections which would have otherwise produced too little DM in th
 e standard thermal scenario. Another interesting consequence of first-
 order PTs could be an efficient trapping of DM in false vacuum domains
 \, and their subsequent collapse to PBHs. Depending on the energy scal
 e of the PT\, these PBHs could make up significant fractions (if not a
 ll) of today’s DM abundance. Whatever their byproducts may be\, firs
 t-order PTs are expected to source stochastic background signals of gr
 avitational waves—potentially probeable by next-generation detectors
 . With this in mind\, all phenomenological results are presented in a 
 robust multi-messenger fashion\; correlating DM or PBH constraints wit
 h gravitational wave signals.
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URL:https://www.physics.wisc.edu/events/?id=8934
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