Nothing that carries information can travel faster than c-
General relativity tells us that they must travel at c- the assumed gauge boson that carries the gravitational force - the graviton (essentially the graviton is to the gravitational force as the photon is to the electromagnetic force) has zero rest mass, and so must travel at the speed of light.
This is a good article on the question:
https://medium.com/starts-with-a-bang/what-is-the-speed-of-gravity-8ada2eb08430
We have experimentally verified that gravitational waves travel at, or very near the speed of light- if the rumors are true that these latest observations have found an optical counterpart to this latest signal at LIGO, then the error bars on the speed will likely be greatly narrowed.
Space/Science » in reply to Why are the propagation of gravitational waves limited to c?
It certainly can be no greater than c
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- LIGO news
- Why are the propagation of gravitational waves limited to c?