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SUMMARY: Core collapse in massive ST theory: phenomenology and observation
 al potential - Roxana Rosca-Mead\, Friedrich Schiller University Jenna
DTSTART:20230203T130000Z
DTEND:20230203T140000Z
UID:TALK196240@talks.cam.ac.uk
CONTACT:Isobel Romero-Shaw
DESCRIPTION:Though General Relativity has been successfully tested so far\
 , concepts such as dark energy and string theory suggest the need of modif
 ying it. Scalar-tensor theory is one of the most popular alternatives disc
 ussed. \nWe produce studies of stellar core collapse in spherical symmetry
  in which we systematically explore the parameter space that characterizes
  the progenitor stars\, the equation of state and the scalar-tensor theory
  of the core collapse events. We identify a remarkably simple and straight
 forward classification scheme of the resulting collapse events. For any gi
 ven set of parameters\, the collapse leads to one of three end states\, a 
 weakly scalarized neutron star\, a strongly scalarized neutron star or a b
 lack hole\, possibly formed in multiple stages. The latter two end states 
 can lead to strong gravitational-wave signals that may be detectable in pr
 esent continuous-wave searches with ground-based detectors. \nThe dispersi
 ve nature of the propagation of waves in the massive scalar field mean the
  GW signals are long lived and many such signals can overlap to form a sto
 chastic background. Using different models for the population of supernova
  events in the nearby universe\, we compute predictions for the energy-den
 sity in the stochastic scalar-polarized GW background from core-collapse e
 vents in massive ST gravity for theory parameters that facilitate strong s
 calarization.
LOCATION:Potter room/Zoom
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