arXiv:1602.04188gr-qc
On constraining the speed of gravitational waves following GW150914
Early discovery. Linked by one identifiable commenter. This paper is outside the main ranking; a mention is not an endorsement.
Abstract
We point out that the observed time delay between the detection of the signal at the Hanford and Livingston LIGO sites from the gravitational wave event GW150914 places an upper bound on the speed of propagation of gravitational waves, $c_{gw}\lesssim 1.7$ in the units of speed of light. Combined with the lower bound from the absence of gravitational Cherenkov losses by cosmic rays that rules out most of subluminal velocities, this gives a model-independent double-sided constraint $1\lesssim c_{gw}\lesssim 1.7$. We compare this result to model-specific constraints from pulsar timing and cosmology.
Yes we still don't know exactly the speed of gravity and as it stands we know it to be the around the same speed of light with a margin of 70% ( https://arxiv.org/abs/1602.04188 ). But with so many theories at play, we still don't know for sure. Indeed, some still believe that…
ZenstView on HNParent context