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Bounding the Speed of Gravity with Gravitational Wave Observations

Research output: Contribution to journalArticlepeer-review

Neil Cornish, Diego Blas, Germano Nardini

Original languageEnglish
Pages (from-to)161102
Number of pages1
JournalPhysical Review Letters
Early online date18 Oct 2017
Accepted/In press21 Sep 2017
E-pub ahead of print18 Oct 2017
Published20 Oct 2017


King's Authors


The time delay between gravitational wave signals arriving at widely separated detectors can be used toplace upper and lower bounds on the speed of gravitational wave propagation. Using a Bayesian approach thatcombines the first three gravitational wave detections reported by the LIGO Scientific and VirgoCollaborations we constrain the gravitational waves propagation speed cgw to the 90% credible interval0.55care made and as more detectors join the worldwide network. Of order 20 detections by the two LIGO detectorswill constrain the speed of gravity to within 20% of the speed of light, while just five detections by the LIGOVirgo-Kagra network will constrain the speed of gravity to within 1% of the speed of light.

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