Shane Record asked:
The question I'd really like to ask is... Following the reconfirmed results that a neutrino can travel faster than light, why is it then assumed that travelling through time is possible?
A neutrino coming from the sun would still take several minutes to reach Earth, say, even if it does get here faster then a ray of light that left at the same time. In the media I haven't found the answer to this question, I just come across the assumption!
Dave - Essentially, if you take all of Einstein’s equations – the first thing it says is that to go at the speed of light, you need an infinite amount of energy which kind of means if you go any faster than the speed of light, if you get out of the speed of light, you need, in fact, energy and all the equations explode, and everything breaks.
But if you put the numbers where you're going faster than the speed of light in there, you sort of get some results which seem a bit more meaningful. It gives the appearance that light – that time appears to be going backwards for you if you are travelling faster than light.
And it essentially makes the direction which you're travelling in seem to look a bit – mathematically - it look more like a time axis and certain time look more like a normal axis.
So, it’s possible that space and time gets really confused for you if you're going faster than the speed of light. But fundamentally, what I've said at the beginning was that all of our maths, our physics, breaks if you can go faster than the speed of light which means we don't really know until we can actually test it, and we get a better theory.
If there is a speed faster than light, then there can only be one preferred reference frame in which that speed is the same in all directions. In a reference frame moving relative to the preferred reference frame, the thing which is faster than light may arrive before it left when moving in one direction, but it will be delayed by the same amount when moving in the opposite direction. Therefore, there is no violation of causality.
Almost certainly not. causality may change a bit at tiny scales but not at ours. Soul Surfer, Mon, 21st Nov 2011
IF a neutrino travels faster than C & time reverses, this would provide explanation of how the universe recycles? As is, universe is expanding & accelerating? CZARCAR, Mon, 21st Nov 2011
Neutrinos travelling through space are slower than c (supernova 1987A) so maybe it is only when they travel through matter they cam be faster? It has been suggested that they take a short cut of some kind.
"the reconfirmed results that a neutrino can travel faster than light?"