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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-4236
DTSTART:20160913T203000Z
DURATION:PT1H0M0S
DTSTAMP:20260416T205054Z
LAST-MODIFIED:20161006T184549Z
LOCATION:5280 Chamberlin
SUMMARY:Baryogenesis from Decaying Magnetic Helicity\, Theory Seminar 
 (High Energy/Cosmology)\, Andrew Long\,  University of Chicago\, Kavli
  Institute for Cosmological Physics (KICP)
DESCRIPTION:Due to quantum anomalies in the Standard Model\, baryon nu
 mber is violated in the early universe in the presence of a helical (h
 yper)magnetic field.  I will discuss how the matter / anti-matter asym
 metry of the universe may have been created from the decaying helicity
  of a primordial (hyper)magnetic field.  This scenario has the interes
 ting feature that baryogenesis occurs without the violation of (B-L)\,
  since the (B+L) asymmetry generated by the hypermagnetic field counte
 racts the washout by electroweak sphalerons.  After the electroweak cr
 ossover\, the hypermagnetic field becomes an electromagnetic field.  T
 hus\, observations of the relic\, intergalactic magnetic field today m
 ay inform our understanding of the cosmological excess of matter over 
 anti-matter.  
URL:https://www.physics.wisc.edu/events/?id=4236
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