Re:Three Super-Massive Black Holes Merging Together in Our N...
by dnadler on Sunday August 29, 2021 @08:36AM
(#28346217)
> interaction implies mass (no?)
Not necessarily. Photons, for example, are massless. But you're still pretty much correct. Information cannot travel faster than C.
Though there may be some special cases that I'm not too familiar with. One I'm a little curious about is entangled quantum particles, though I'd have to do a little reading to be able to say anything further.
But then I started to think about it and it doesn’t seem exactly right either. Causality kind of implies interaction, and interaction implies mass (no?), so causality as such must necessarily be strictly slower than C. That is, the speed of the propagation of the wave function between causally connects to events is C but causality as such are the interesting things happening at those events.