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SUMMARY:Francesco Crescimbeni "GWTC-4.0: Tests of General Relativity. II. 
 Parameterized Tests"
DTSTART:20260415T103000Z
DTEND:20260415T120000Z
DTSTAMP:20260502T040100Z
UID:indico-event-51849@agenda.infn.it
DESCRIPTION:In this second of three papers on tests of general relativity 
 (GR) applied to the compact binary coalescence signals in the fourth Gravi
 tational-Wave Transient Catalog (GWTC-4.0)\, we present the results of the
  parameterized tests of GR and constraints on line-of-sight acceleration. 
 We include events up to and including the first part of the fourth observi
 ng run (O4a) of the LIGO Virgo KAGRA detectors. As in the other two papers
  in this series\, we restrict our analysis to the 42 confident signals\, m
 easured by at least two detectors\, that have false alarm rates \\le 10^{-
 3} \\mathrm{yr}^{-1} from O4a\, in addition to the 49 such events from pre
 vious observing runs. This paper focuses on the eight tests that constrain
  parameterized deviations from the expected GR (or unaccelerated) values. 
 These include modifications of post-Newtonian (PN) parameters\, spin-induc
 ed quadrupole moments different from those of a binary black hole\, and po
 ssible dispersive or birefringent propagation effects. Overall\, we find n
 o evidence for physics beyond GR\, for spin-induced quadrupole moments dif
 ferent from those of a Kerr black hole in GR\, or for line of sight accele
 ration\, with more than 90% of the events including the null result (no de
 viation) within their 90% credible intervals. We discuss possible systemat
 ics affecting the other events and tests\, even though they are statistica
 lly not surprising\, given noise. We improve the bounds on deviations from
  the GR PN coefficients by factors of 1.2-5.5 and provide illustrative tra
 nslations to constraints on some modified theories. Also\, we update the b
 ound on the mass of the graviton\, at 90% credibility\, to m_g \\leq 1.92\
 \times 10^{-23} \\mathrm{eV}/c^2. Thus\, we see that GR holds\, and many o
 f the bounds on possible deviations derived from our events are the best t
 o date.\n\nhttps://agenda.infn.it/event/51849/
URL:https://agenda.infn.it/event/51849/
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