2017-12-06 16:38:50 UTC
(1) The gravitational waves travel at the speed of light.
(2) The gravitational waves experience a delay equal to the Shapiro delay experienced by light.
According to Arthur Eddington, Einstein's general relativity says nothing about the speed of gravitational waves, let alone their time-delay:
Arthur Eddington: "The statement that in the relativity theory gravitational waves are propagated with the speed of light has, I believe, been based entirely upon the foregoing investigation; but it will be seen that it is only true in a very conventional sense. If coordinates are chosen so as to satisfy a certain condition which has no very clear geometrical importance, the speed is that of light; if the coordinates are slightly different the speed is altogether different from that of light. The result stands or falls by the choice of coordinates and, so far as can be judged, the coordinates here used were purposely introduced in order to obtain the simplification which results from representing the propagation as occurring with the speed of light. The argument thus follows a vicious circle." The Mathematical Theory of Relativity, pp. 130-131 https://www.amazon.com/Mathematical-Theory-Relativity-S-Eddington/dp/0521091659
So what is the a priori probability that the gravitational waves (if they exist) arrive simultaneously with the optical signal? Answer: Zero.
That is, if LIGO's fake involved different times of arrival, that would at least have sounded realistic. The claim that the gravitational waves and the optical signal arrived at exactly the same time, which implies that they not only travel at the same speed but also experience the same time-delay as they pass near massive objects, unequivocally proves that the gravitational wave signals "discovered" by LIGO conspirators are fake.
From now on, in order to pass LIGO's test, any theory, scientific or pseudoscientific, would have to have the statements (1) and (2) above among its predictions. This would take a lot of courage and dishonesty and may prove virtually impossible - both statements are false. Unless LIGO fraud is officially exposed, both science and pseudoscience will be paralyzed.
Partial killing of theories has already started:
"Merging Neutron Stars Deliver Deathblow To Dark Matter And Dark Energy Alternatives. [...] In Einstein's theory, the speed of gravity equals the speed of light, exactly, and at all times. But in many alternatives, that assumption gets tweaked. [...] But the fact that gamma rays and gravitational waves from the merging neutron star event GW170817 arrived within 1.7 seconds of one another means that the speed of gravity must equal the speed of light to better than 1 part in 10^15. As a result, a huge slew of alternatives to standard General Relativity with standard dark energy are ruled out." https://www.forbes.com/sites/startswithabang/2017/10/25/merging-neutron-stars-deliver-deathblow-to-dark-matter-and-dark-energy-alternatives/
Constraints on cosmic strings using data from the first Advanced LIGO observing run https://arxiv.org/abs/1712.01168