It's vital to remember that nothing can exceed the speed of light in a vacuum, but that there is nothing that prevents certain things from going faster than light in a medium other than a vacuum. (That's because the light is slowed down by the medium.) This is what causes Cherenkov radiation.The finding doesn't go against Einstein's theory because this effect happens in the jet medium not a vacuum.
The article is interesting, but doesn't violate anything already known about physics.While electrodynamics holds that the speed of light in a vacuum is a universal constant (c), the speed at which light propagates in a material may be significantly less than c. For example, the speed of the propagation of light in water is only 0.75c. Matter can be accelerated beyond this speed (although still to less than c) during nuclear reactions and in particle accelerators. Cherenkov radiation results when a charged particle, most commonly an electron, travels through a dielectric (electrically polarizable) medium with a speed greater than that at which light propagates in the same medium.
No, as @Victoria Silverwolf stated the hard limit of the speed of light in a vacuum has not been breached.Is it an effect that is observed to be faster than light, but not an actual thing that moves that fast? The universe is expanding faster than light, for instance.
I was trying to use to illustrate two points traveling apart from each other at a total speed exceeding C as not violating relativity, using the edges of the universe as an example. I missed the local medium part, which is why I was asking if that applied or not. Thank you for the correction.No, as @Victoria Silverwolf stated the hard limit of the speed of light in a vacuum has not been breached.
And no the universe is not expanding faster than light. It is true that some parts of our universe, depending on their geometry are effectively travelling faster than light and are disappearing from our view, as the expansion of the universe has nothing to do with Relativity.
But, if the universe was expanding faster than light then we wouldn't see anything as any light emitted wouldn't be able to travel to hit our eyeballs.
okay, this is purely without looking at any other sources and just using the grey matter in my noggin (hence I am probably about to write down something wrong...)I seem to remember that the limit is a particle breaking through the barrier of the speed of light but that it’s ok for a particle to exceed the speed of light if it is already doing so. (a tachyon?).
I may be talking nonsense here and dreamt it all. Apologies if so.
Also my post may have nothing at all to do with the thread. Apologies again.
No they don't. There's a catch somewhere. Count on it, lol ...