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PRODID:UW-Madison-Physics-Events
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UID:UW-Physics-Event-8190
DTSTART:20230329T180000Z
DTEND:20230329T193000Z
DTSTAMP:20260414T050618Z
LAST-MODIFIED:20230202T163621Z
LOCATION:5280 Chamberlin 
SUMMARY:Axion assisted Schwinger effect\, Theory Seminar (High Energy/
 Cosmology)\, Yohei Ema\, University of Minnesota
DESCRIPTION:Particle production in strong electromagnetic fields\, the
  Schwinger effect\, is a recurring theme in solid state physics\, heav
 y ion collisions\, early universe cosmology and formal quantum field t
 heory. In this talk\, after reviewing the standard Schwinger effect\, 
 we show that the pair production rate of charged fermions in a strong 
 electric field is enhanced in the presence of time dependent classical
  axion-like background field\, which we call axion assisted Schwinger 
 effect.  While the standard Schwinger production rate is proportional 
 to $\\exp(−\\pi(m^2+p^2_T)/E)$\, with $m$ and $p_T$ denoting the fer
 mion mass and its momentum transverse to the electric field $E$\, the 
 axion assisted Schwinger effect can be enhanced at large momenta to $\
 \exp(−\\pi m^2/E)$. We interpret the origin of this enhancement as a
  coupling between the fermion spin and its momentum\, induced by the a
 xion velocity.
URL:https://www.physics.wisc.edu/events/?id=8190
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