No, they say that arms are expanded and contracted, but this means that measured speed of light must c±delta, while measured speed of light is in c...c-delta ra

No, they say that arms are expanded and contracted, but this means that measured speed of light must c±delta, while measured speed of light is in c...c-delta range. AFAIK. Moreover, if arms are just expanded/contracted, i.e. it's density wave, then gravitational waves and light from distant mergers should arrive at the same time ± few milliseconds, while light arrived 1.7 seconds later, i.e. light is slower by 1E-15. Moreover, somebody told me that density wave is not possible for gravitation, because gravitons should be massless(of course) spin-2 particles. IMHO it a wave of flips or deflections. See also https://en.wikipedia.org/wiki/Variable_speed_of_light https://en.wikipedia.org/wiki/Variable_speed_of_light Anyway, Higgs «field», which gives mass, exists, so a medium, which exists at any point of our Univers, exists, so gravitational waves are waves in a g-medium, which is connected to the Higgs medium somehow, thus, for gravitation, c is speed of gravitation in the medium. For light, it should be same. I see no reason to say that c is the speed of gravitation in g-medium, while light propagates in pure nothing and c is the top speed in the pure nothing. Nonsense.