Question about travelling faster than light.

[SJBauer]

Tachyons are theoretical particles or waves that travel faster than the speed of light. Tachyons exist in a theoretical world where objects have negative mass. Negative mass is most easily define as a volume of negative density; i.e. -mass = volume * -density. Ergo negative mass density. This is preferable to calculations using invariant mass that involve the square root of a negative number, i.e., imaginary.

 

[PAllen]

Tachyons are theoretical particles or waves that travel faster than the speed of light. Tachyons exist in a theoretical world where objects have negative mass. Negative mass is most easily define as a volume of negative density; i.e. -mass = volume * -density. Ergo negative mass density. This is preferable to calculations using invariant mass that involve the square root of a negative number, i.e., imaginary.

Repeating a wrong doesn't make it right. There is no accepted definition of mass or energy for tachyons that comes out negative. Total energy and KE for a tachyon are positive. Mass (rest, invariant) is imaginary. Please do not repeat again a false statement.