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SUMMARY:Cosmological Perturbations of Axion Dark Matter
DTSTART:20260528T010000Z
DTEND:20260528T020000Z
DTSTAMP:20260519T032900Z
UID:indico-event-18090@indico.global
DESCRIPTION:Speakers: Itamar Allali (University of Notre Dame)\n\nCosmolog
 ical data provides us two key constraints on dark matter (DM): it must hav
 e a particular abundance\, and it must have an adiabatic spectrum of densi
 ty perturbations in the early universe. Many different cosmological scenar
 ios have been proposed that establish the abundance of axion DM in qualita
 tively different ways. In this talk\, I will emphasize that\, despite this
  variety of backgrounds\, the perturbations in axion DM can be understood 
 from universal principles. How does a feebly interacting axion field acqui
 re perturbations proportional to those of photons? How do the isocurvature
  power spectrum and non-Gaussianity depend on the background evolution of 
 the universe? I will answer these questions for a general choice of cosmol
 ogical background and temperature-dependent axion potential.  \n\nhttps:
 //indico.global/event/18090/
URL:https://indico.global/event/18090/
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