I'd say that if there's acceleration, then the speed won't be constant. But the basic conceptual problem here is that a photon can't be at rest, and is always moving at c. It's that wave-particle duality thing (as I interpret it): If a photon were only a particle you could think of it accelerating from rest to some speed, but as a wave it just starts and stops; it's more like a signal than a bowling ball rolling through the universe (but also kinda like a bowling ball, too ;-))
This is straining my brain, considering that I'm far from being a physicist. In fact, I have to confess that I had to consult wikipedia to verify my recollection about the nonstoppable photons. I wouldn't want you to take my answers as authoritative, I just enjoy riffing on physics.
Space/Science » in reply to Re: Neutrinos are FTL-capable again.
Re: Neutrinos are FTL-capable again.
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- Neutrinos are FTL-capable again.