And, yeah its true that the limiting speed in relativity is 3x10^8 m/s. But my main question is whether the particle will be able to experience time travel or not ? You can assume that the medium of refractive index 'n' is the world for that particle, and in its world the particle is traveling...
It is known that in a medium of refractive index 'n' , the speed of light becomes c/n. So if we can make a medium of high refractive index, then the speed of light will be substantially less in that medium. Then it can be possible to accelerate particles inside that medium at speeds greater than...