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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:2
UID:UW-Physics-Event-9693
DTSTART:20260529T150000Z
DTEND:20260529T170000Z
DTSTAMP:20260513T144904Z
LAST-MODIFIED:20260504T210651Z
LOCATION:Chamberlin 5280 or https://uwmadison.zoom.us/j/9111125130
SUMMARY:Baryoid Dark Matter: Explaining the Dark Matter-Baryon Coincid
 ence\, Graduate Program Event\, Dean Chen\, Physics PhD Graduate Stude
 nt
DESCRIPTION:In this talk\, I will discuss how the dark matter-baryon c
 oincidence\, namely the observation that the dark matter abundance is 
 about five times the baryon abundance\, can be explained if dark matte
 r is a novel macroscopic baryonic state: baryoid. Starting from a spon
 taneously broken Z_N symmetry\, the universe is divided into roughly e
 qual numbers of domains occupying one of the N-fold degenerate vacua\,
  leading to an approximate (N−1):1 baryon-abundance ratio between th
 e false- and true-vacuum domains. Once the degeneracy is lifted by a Q
 CD-triggered bias potential\, the domain walls begin to collapse. Beca
 use baryons have reduced masses in the false-vacuum domains\, they are
  efficiently trapped within the shrinking false-vacuum regions during 
 non-relativistic domain-wall collapse\, eventually forming stable bary
 oids. We show that this mechanism can successfully explain the dark ma
 tter-baryon coincidence and discuss potential experimental searches
URL:https://www.physics.wisc.edu/events/?id=9693
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