Answer 1:
So far, the existence of tachyons, which are
particles that move faster than the speed of
light, is still just a theory. There have
not been any confirmed observations of such
particles, although physicists are devising
experiments to look for them.
The existence of tachyons is not consistent
with the current models and theories of the
universe (particularly Einstein's theory of
special relativity), however, historically,
theories about the universal laws of physics have
experienced revisions as we discover and explain
new phenomena.
Whether or not tachyons are real, the idea is
fascinating, and it's important to propose new
ideas in Physics and examine under what
mathematical and physical conditions they could be
true. This is where physicists get to exercise
their creative minds!
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