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SUMMARY:QCD axion production in the early Universe
DTSTART:20221216T140000
DTEND:20221216T150000
DTSTAMP:20260427T221025Z
UID:7073f3ea0a17c8925aed5a06f67c318e153272d157f4416fabbbf2fc
CATEGORIES:Conferences - Seminars
DESCRIPTION:Fabrizio Rompineve\nA population of relativistic QCD axions ca
 n be produced in the early Universe\, via scatterings with Standard Model 
 particles. This can be searched for in cosmological datasets\, which there
 fore provide the opportunity to discover/constrain the QCD axion\, indepen
 dently of astrophysical and/or laboratory probes. \n\nIn this talk\, afte
 r reviewing the subject\, I present an improved calculation of the relic a
 bundance of such “hot” axions from scatterings with pions below the QC
 D crossover\, as well as the resulting upper bound on the QCD axion mass. 
 I then discuss the exciting outlook of upcoming cosmological surveys\, whi
 ch may probe otherwise unexplored regions of the QCD axion parameter space
 . I highlight the need of a non-perturbative calculation of axion producti
 on rates throughout the QCD crossover\, to fully exploit the reach of such
  datasets.
LOCATION:BSP 727 https://plan.epfl.ch/?room==BSP%20727 https://epfl.zoom.u
 s/j/67529935509
STATUS:CONFIRMED
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