i heard tht tachyon is the only thing in the world tht canmove faster thn light.wht is it?how can it possible?

Question

if it is possible,then we should doubt about einstein teoris?is it true tht ufos(if they exist)prove tht einstein was wrong about hes teoris?
imagine E^2-c^2P^2=m^2c^4
and p is the distance...if m2>0,then E>cp,we use it for attoms,and microscopic materials
M2=0,so vc ?r tachyons exist?

Answer 1

Tachyons are permitted to exist by the theories of relativity, but there is no evidence that they do. Anyways, they make for plausible premises for sci fi novels.

Answer 2

No object with [a real] mass can travel at, or faster than the speed of light.

Only objects with no rest mas can travel at the speed of light (like a photon).

Tachyons are a purely theoretical particle which are said to (in theory) have an imaginary mass and only be able to travel faster than the speed of light. When you square an imaginary mass you get a negative value (i^2 = -1).

http://math.ucr.edu/home/baez/physics/ParticleAndNuclear/tachyons.html