BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Revisiting Isocurvature Bounds on the Minimal QCD Axion
DTSTART:20260309T130000Z
DTEND:20260309T150000Z
DTSTAMP:20260507T233600Z
UID:indico-event-51042@agenda.infn.it
DESCRIPTION:Speakers: Davide Racco (Roma Tre)\n\nThe QCD axion is a well-m
 otivated candidate for dark matter. For one of the two cosmological histor
 ies for this candidate\, the pre-inflationary scenario\, the PQ symmetry i
 s not restored after inflation. Depending on the inflationary Hubble rate\
 , this scenario can be constrained by the strong limits on its isocurvatur
 e perturbations on large scales.We discuss how this constraint is naturall
 y evaded when the quartic coupling of the complex U(1)_PQ field is small a
 nd its vev is enhanced during inflation\, and how this solution is not jeo
 pardised by parametric resonance over a significant portion of parameter s
 pace. The common lore\, that isocurvature is a potential downside of the p
 re-inflationary axion\, might be less stringent than what is commonly thou
 ght.\n\nhttps://agenda.infn.it/event/51042/
LOCATION:Grassano (Roma Tor Vergata)
URL:https://agenda.infn.it/event/51042/
END:VEVENT
END:VCALENDAR