Looks like I'll never stop thinking up explanations denying Einstein's theory that the speed of light is an absolute limit. If the universe has limits I wouldn't want to live in it. I'd get out of here to complain that I want another one.
So the LIGO stations (1000 km apart) detected the gravity waves with a 7 ms difference, and the maximum would be 10ms if they travel at light speed. But it may be possible that what they picked up was an electromagnetic aftershock caused by the actual gravity waves, and that the latter traveled so fast that they weren't directly detected: I've always thought it made more sense that relativistic effects affect matter rather than space, since space is just the absence of matter: if so, then gravity waves would contract and expand matter, causing stress which would create an electromagnetic aftershock of slower contraction and expansion behind it. Electromagnetic contraction is also how Lorentz explained the results of the Michelson-Morley effect, an effect which Einstein then repurposed to suit his own theory.
If Tom van Flandern is correct and the speed of gravity is 20 billion c, the gravity waves would've arrived with a difference of maximum 500 femtoseconds. It would be impossible to measure faster-than-light speeds with the LIGO stations anyway because their measurement depends on the timing of the arrival of light rays. In that time interval, the gravity waves would've already flowed over them with both crest and trough, contracting and expanding matter equally so that one negated the other.
Even if this turns out to be wrong as well, there can always be other particles that are faster than light that we don't know about, perhaps virtual particles.
Either way I'll always refuse to believe in a universe with speed limits or limits of any sort. The universe can't have a limit in size because then there'd have to be something causing that limit, and if it's not infinite in size, then on some scale, gravity and anti-gravity (dark energy) would be so balanced that they could form levels of existence as complex as our own (as balance between opposites always does)… we'd be on a random such level, meaning there'd be infinitely many levels above and below us and the speed of light could not be the smallest level. I'm not impressed by this research — but I'm disappointed that the belief in limits hasn't finally become shattered.
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