2017-11-16 08:30:03 UTC
"The looming rejection of the WIMP hypothesis is encouraging for the few physicists who claim that dark matter itself is a red herring. "I hope people will become even more open-minded," says McGaugh, who has studied modified versions of gravity that negate the need for dark matter." https://www.nature.com/news/dark-matter-hunt-fails-to-find-the-elusive-particles-1.22970
My comment in Nature:
Not if LIGO fraud remains unexposed:
"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/
The crucial questions are:
Does Einstein's general relativity predict that gravitational waves travel at the speed of light? Does it predict how the Shapiro delay for gravitational waves compares with the Shapiro delay for light?
The answer to both questions is 'no'. According to Arthur Eddington, Einstein's general relativity says nothing about the speed of gravitational waves, let alone their Shapiro 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, in the neutron star case, LIGO's fabrication 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 Shapiro delay, unequivocally proves that LIGO conspirators just faked the gravitational wave signals.