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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-6921
DTSTART:20220415T180000Z
DURATION:PT1H0M0S
DTSTAMP:20260414T145149Z
LAST-MODIFIED:20220410T122332Z
LOCATION:Chamberlin 5280
SUMMARY:A Cosmological Lithium Solution from Discrete Gauged Baryon Mi
 nus Lepton Number\, Theory Seminar (High Energy/Cosmology)\, Seth Kore
 n\, University of Chicago
DESCRIPTION:We propose the infrared gauge symmetry of our sector inclu
 des an unbroken discrete gauged subgroup of baryon minus lepton number
  of order 2 x 3 colors x 3 generations = 18\, the inclusion of which d
 oes not modify local physics. We UV complete this at Λ as the familia
 r U(1)_{B-NcL} Abelian Higgs theory\, and the early universe phase tra
 nsition forms cosmic strings which are charged under an emergent highe
 r-form gauge symmetry. These topological defects catalyze interactions
  which turn 3 baryons into 3 leptons at strong scale rates in an analo
 gue of the Callan-Rubakov effect.<br>
\n<br>
\nThe cosmological lithiu
 m problem---that the observed primordial abundance is lower than theor
 etical expectations by a factor of a few---is perhaps the most statist
 ically significant anomaly of SM+ΛCDM\, and has resisted decades of a
 ttempts by cosmologists\, nuclear physicists\, and astronomers alike t
 o root out systematics. We write down a model in which B-NcL strings s
 uperconduct bosonic global baryon plus lepton currents and catalyze so
 lely 3p+ → 3e+. We suggest that such cosmic strings have disintegrat
 ed O(1) of the lithium nuclei formed during Big Bang Nucleosynthesis a
 nd estimate the rate\, with our benchmark model finding Λ∼108 GeV g
 ives the right number density of strings. 
URL:https://www.physics.wisc.edu/events/?id=6921
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