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SUMMARY:Particle production during Axion Inflation
DTSTART:20181008T140000
DTEND:20181008T153000
DTSTAMP:20260510T084038Z
UID:78dedf03d9167707ef2b1341e935dad36bc2c8996562c22835fa476b
CATEGORIES:Conferences - Seminars
DESCRIPTION:Valerie Domcke (DESY Hamburg)\n\nIdentifying the particle driv
 ing cosmic inflation as a pseudoscalar (i.e. an axion-like particle) provi
 des a naturally flat direction in field space along which slow-roll inflat
 ion may proceed. The rich phenomenology of this model includes an enhanced
  chiral graviational wave spectrum as well as strong particle production d
 uring inflation. In particular\, in the presence of a chiral anomaly\, the
 re is a dual production of helical Abelian gauge fields and chiral fermion
 s through the Chern-Simons coupling to the inflaton. The motion of the inf
 laton induces a tachyonic instability for one of the two helicities of the
  gauge field. The resulting helical gauge field necessarily leads to the p
 roduction of chiral fermions by deforming their Fermi sphere into discrete
  Landau levels. The population of the lowest Landau level leads to a chira
 l asymmetry as inferred from the chiral anomaly\, while the higher levels 
 are populated symmetrically through pair production. From the backreaction
  of the fermions on the gauge field production we derive a conservative bu
 t stringent upper bound on the magnitude of the gauge fields. This signif
 icantly impacts the predictions for the scalar and tensor power spectra of
  axion inflation and may also have far-reaching consequences for leptogene
 sis.
LOCATION:BSP 727 https://plan.epfl.ch/?room==BSP%20727
STATUS:CONFIRMED
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