What is the theory behind the existence of tachyons ?

Question

who put forth the idea of tachyons and hoe did he/she reach the conclusion ?

Answer 1

Einstien said that the speed of light was the cosmic speed limit and nothing could go faster. light is fast but not is unimaginably slow when u think of how big the universe. If is takes 2 million years at the speed of light which einstien said was impossible for matter to travel to get to andromeda our closest galactic neighbour then we are surely trapped within our steller neighbours. so people looked to find another way around this problems. one idea was wormholes which I believe is irrational for space travel and the other being tachyons.tachyons speed limit is also light but it means that it cannot go slower than light.A tachyon travels at these speeds by bending spacetime fabric in such a way that spacetime is what pushes it into these speeds. Propulsion was one of the things that made einstien make this claim about light. The idea of tachyons are purely theoretical but I believe that in the near future that it could be a reality.    

Answer 2

Wikipedia comments, 'A tachyon (from the Greek ταχυόνιον, takhyónion, from ταχύς, takhýs, i.e. swift, fast) is any hypothetical particle that travels at superluminal speed. The first description of tachyons is attributed to German physicist Arnold Sommerfeld; however, it was George Sudarshan, Olexa-Myron Bilaniuk, Vijay Deshpande  and Gerald Feinberg (who originally coined the term in the 1960s) that advanced a theoretical framework for their study. Tachyonic fields have appeared theoretically in a variety of contexts, such as the Bosonic string theory. In the language of special relativity, a tachyon is a particle with space-like four-momentum and imaginary proper time. A tachyon is constrained to the space-like portion of the energy-momentum graph. Therefore, it cannot slow down to subluminal speeds. Even if tachyons were conventional, localisable particles, they would still preserve the basic tenets of causality in special relativity and not allow transmission of information faster than light, contrary to what has been written in many works of science fiction.

Today, in the framework of quantum field theory, tachyons are best understood as signifying an instability of the system and treated using tachyon condensation, rather than as real faster-than-light particles, and such instabilities are described by tachyonic fields. According to the contemporary and widely accepted understanding of the concept of a particle, tachyon particles are too unstable to be treated as existing. By that theory, faster than light information transmission and causality violation with tachyons are impossible on both grounds: they are non-existent in the first place (by tachyon condensation) and even if they existed (by Feinberg's analysis]) they wouldn't be able to transmit information (also by Feinberg's analysis). Despite the theoretical arguments against the existence of tachyon particles, experimental searches have been conducted to test the assumption against their existence; however, no experimental evidence for or against the existence of tachyon particles has been found. '

Try: -

http://en.wikipedia.org/wiki/Tachyons

for further details.  

Answer 3

Einstein once suggested that in a different universe, there could be different laws, and it would be possible for objects to move only at higher than light speed, such bodies are known as tachyons. Because the great man said such a thing science looked into it and carried out experiments in an effort to locate a tachyon at the edges of our universe. None were found.