The ultimate speed Tachyons | more than speed of light | Time travel | travel to past
Channel: SCIENCE The Awesome Inventions
Date: 02/06/2021

Time travel 
ultimate speed
ECG Sudarshan
THE ULTIMATE SPEED
We saw in example  that even if we continue to apply a force on a particle for a long time, its speed cannot exceed c. This is a very general result in special relativity. In fact, no information can be sent with a speed greater than c. If we assume that information can be sent with a speed greater than c, it turns out that we shall have frames in which a bullet will hit the bird before it is actually fired, a dog can die before it is born and so on. If the effect cannot precede its cause in any frame, then c is the ultimate speed for
any material particle or information.
Scientists have worked out the mathematics for a world in which all the particles are moving with respect to each other with speeds greater than c. Such a world can exist without violating the postulates of relativity but these particles can never be slowed down to a speed less than c. The particles of this hypothetical world cannot interact with ours and in that world, effect will always precede its cause. Such particles are named tachyons and a group of physicists is working to explore the possibility of the actual existence of such particles. These large speeds and the unworldly results remind us of several stories from Indian Scriptures and no wonder the idea of tachyons was mooted by an Indian scientists E.C.G Sudarshan .

Tachyons

grandfather paradox

wrong of relativity
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