Can there be a speed higher than light

[Ignat]

It follows from Special theory of relativity that as the speed of movement increases, three circumstances arise: the mass of the moving object increases, its size decreases in the direction of movement, and the passage of time on this object slows down (from the point of view of an external "resting" observer). At normal speeds, these changes are negligible, but as they approach the speed of light, they become more noticeable, and at the limit - at a speed equal to c - the mass becomes infinitely large, the object completely loses size in the direction of movement and time stops on it. Therefore, no material body can reach the speed of light. Only the light itself has such a speed, as well as the "all-pervading" particle, the neutrino, which, like the photon, cannot move at a speed lower than C.

How can there be processes occurring at a speed faster than the speed of light? The following options are possible here:

• The physical laws at superluminal speeds differ from the classical ones and Special theory of relativity restrictions cease to apply;

• Interactions at superluminal speeds are possible for those types of matter that are still unknown.

Is it possible to turn back time, i.e. is it possible to build a time machine? Apparently not! First, it is impossible to return the infinite to its original state. Secondly, each state of matter is individual and cannot be repeated. In other words, to create a time machine, it would be necessary to return to its original state, not only our universe, but all matter, i.e. the entire infinite objective world, which is practically impossible.

Claims about time lapses, "time loops", etc. are also pure fiction. Due to its infinity, matter can never repeat any previous state, it will still differ in some way.

 

[Helio]

It follows from Special theory of relativity that as the speed of movement increases, three circumstances arise: the mass of the moving object increases, its size decreases in the direction of movement, and the passage of time on this object slows down (from the point of view of an external "resting" observer). At normal speeds, these changes are negligible, but as they approach the speed of light, they become more noticeable, and at the limit - at a speed equal to c - the mass becomes infinitely large, the object completely loses size in the direction of movement and time stops on it. Therefore, no material body can reach the speed of light.

Yes. That is essentially a law in Relativity.

Only the light itself has such a speed, as well as the "all-pervading" particle, the neutrino, which, like the photon, cannot move at a speed lower than C.

This was the original view of the speed of neutrinos. But from Dr. Davis, and lots of Clorox (so to speak), he discovered, that neutrinos can change from one type to another, of the three known types. IIRC. Thus, for this to happen, they are traveling slightly slower than the speed of light.

How can there be processes occurring at a speed faster than the speed of light? The following options are possible here:

There is, for one case, the hypothetical tachyon. It is emitted at a speed > c, thus there is no process needed to gain speed to get it faster than c once emitted. But, all searches have failed to find it, so far.