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SUMMARY:Particle production during Axion Inflation - Valerie Domcke (DESY 
 Hamburg)
DTSTART:20181109T160000Z
DTEND:20181109T170000Z
UID:TALK110464@talks.cam.ac.uk
CONTACT:Francesco Coradeschi
DESCRIPTION:Find the slides at:\n\nhttp://www.hep.phy.cam.ac.uk/~conferenc
 e/V_domcke-09_11_18.pdf\n\nIdentifying the particle driving cosmic inflati
 on as a pseudoscalar (i.e. an axion-like particle) provides a naturally fl
 at direction in field space along which slow-roll inflation may proceed. T
 he rich phenomenology of this model includes an enhanced chiral graviation
 al wave spectrum as well as strong particle production during inflation. I
 n particular\, in the presence of a chiral anomaly\, there is a dual produ
 ction of helical Abelian gauge fields and chiral fermions through the Cher
 n-Simons coupling to the inflaton. The motion of the inflaton induces a ta
 chyonic instability for one of the two helicities of the gauge field. The 
 resulting helical gauge field necessarily leads to the production of chira
 l fermions by deforming their Fermi sphere into discrete Landau levels. Th
 e population of the lowest Landau level leads to a chiral asymmetry as inf
 erred from the chiral anomaly\, while the higher levels are populated symm
 etrically through pair production. From the backreaction of the fermions o
 n the gauge field production we derive a conservative but stringent upper 
 bound on the magnitude of the gauge fields. This significantly impacts the
  predictions for the scalar and tensor power spectra of axion inflation an
 d may also have far-reaching consequences for leptogenesis and the generat
 ion of primordial magnetic fields.
LOCATION:MR19 (Potter Room\, Pavilion B)\, CMS
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