BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Probing the Early Universe with Axion Physics - Luca Visinelli 
DTSTART:20200203T130000Z
DTEND:20200203T140000Z
UID:TALK135928@talks.cam.ac.uk
CONTACT:William Coulton
DESCRIPTION:Axions and axion-like particles are excellent dark matter cand
 idates\, spanning a vast range of mass scales from the milli- and micro-eV
  for the QCD axion\, to 10^-22eV for ultralight axions\, to even lighter c
 andidates that make up the “axiverse”. In some scenarios\, inhomogenei
 ties in the axion density lead to the formation of compact structures know
 n as axion “miniclusters” and axion stars. Topological defects in the 
 early universe might also contribute the energy density of axions and gene
 rate primordial gravitational waves that can possibly be detected in futur
 e experiments. I will first discuss astrophysical and cosmological constra
 ints on axions at either end of this spectrum\, using data from the cosmic
  microwave background anisotropies and the effects of miniclusters on the 
 gravitational microlensing and on direct detection. I will then assess the
  formation and the evolution of axion stars in various astrophysical regim
 es.
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
END:VEVENT
END:VCALENDAR