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SUMMARY:Gravitational-wave probes of axion-like-particles - Geraldine Serv
 ant - DESY
DTSTART:20220502T120000Z
DTEND:20220502T130000Z
UID:TALK173843@talks.cam.ac.uk
CONTACT:Francesco
DESCRIPTION:It is usually assumed that the axion starts oscillating around
  its minimum from its initially frozen position. However\, the early dynam
 ics of the Peccei-Quinn field can induce a large kinetic energy in the axi
 on field\, which starts rotating during its early evolution\, before it ge
 ts trapped in one minimum. This can modify the equation of state of the un
 iverse by triggering a kination era before the axion acquires its mass.\nT
 his imprints a smoking-gun gravitational-wave peak on the primordial gravi
 tational-wave background in the sensitivity bands of LISA\, ET\, and CE. F
 uture gravitational-wave observatories will thus offer a new window on axi
 on models. I will present explicit realisations. I will also discuss how t
 his dynamics opens up the allowed parameter space for ALP dark matter and 
 other observational consequences.
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
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