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SUMMARY:Chen Yuan (ITP\,  Chinese Academy of Sciences)
DTSTART:20210527T133000Z
DTEND:20210527T143000Z
DTSTAMP:20260423T021240Z
UID:CENTRA/44
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/CENTRA/44/">
 Non-tensorial Gravitational Wave Background in NANOGrav 12.5-Year Data Set
 </a>\nby Chen Yuan (ITP\,  Chinese Academy of Sciences) as part of CENTRA 
 Seminar\n\n\nAbstract\nThe North American Nanohertz Observatory for Gravit
 ational Waves (NANOGrav) collaboration has reported a strong evidence of a
  stochastic process\, modeled as a power-law\, with common amplitude and s
 pectral index among all pulsars. However\, there is no statistically signi
 ficant evidence for quadrupolar spatial correlations and hence this proces
 s can not be explained by a gravitational-wave background (GWB) detection.
  We perform a search for an isotropic non-tensorial GWB allowed in general
  metric theories of gravity in the NANOGrav 12.5-year data set. By modelin
 g the GWB as a power-law spectrum\, we find strong Bayesian evidence for a
  spatially correlated process with scalar transverse (ST) correlations.\n
LOCATION:https://researchseminars.org/talk/CENTRA/44/
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