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SUMMARY:Constraining phase transitions with LISA - Prospects and degenerac
 ies - Jorinde van de Vis - DESY
DTSTART:20220207T130000Z
DTEND:20220207T140000Z
UID:TALK168683@talks.cam.ac.uk
CONTACT:Francesco
DESCRIPTION:Sound waves sourced by bubble collisions during a cosmological
  first order phase transition can constitute an observable gravitational w
 ave signal. In the standard picture\, the gravitational wave spectrum is d
 escribed in terms of four parameters: the wall velocity and the strength\,
  duration and temperature of the phase transition. These parameters set th
 e amplitude and peak position of the broken power law that describes the g
 ravitational wave spectrum\, which can be measured by LISA. In this talk\,
  I will refine this picture. The sound shell model and hybrid simulations 
 have demonstrated that the gravitational wave spectrum has a more complica
 ted structure than the simple broken power law. I will discuss LISA’s ab
 ility to extract this additional information. I will then point out that t
 he gravitational wave spectrum is not just a function of four parameters\,
  but that further details of the new physics model enter via the speed of 
 sound. Lastly\, I will demonstrate that density perturbations can enhance 
 and deform the signal.
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
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