Time Travel

[Souleater]

Firstly, you're talking about tachyons. They are hypothetical particles used in thought experiments, not observed scientific phenomena. If you truly believe there are 'instances where the speed of light are exceeded', please link me to some hard proof - a scientific journal would suffice. I can guarantee you won't find any.

Take into account that i neer said that a vessal would exceed the speed of light. I said nothing of other sources.
Sound pulses exceed speed of light - LiveScience- msnbc.com

""I believe that this is the first experimental demonstration of sound going faster than light," Robertson said. Past research has proven it possible to transmit electrical and even light pulses with group velocities exceeding c." from near the middle of the article.

Your proposal of dark matter and dark energy to violate the principle of special relativity is, in itself a contradiction. Now, I'm no cosmologist, but from what I've read they're linked more so to Einstein's general relativity. It should also be noted that little is known about dark energy/matter, so all we have to go on is proposed theories. Most cosmologists agree that dark energy is causing the accelerating rate of expansion of our universe, and as this rate continues to increase, some surrounding galaxy's radial velocity will exceed the speed of light; this is because of a bending in space-time, and thus does not violate special relativity.

Dark matter is technically considered a tachyom, however WIMP (Weakly Interactive Massive Particles) Dark Matter is only a matter of time before it can be engineered, as again, so long as the appropriate research is performed to study and create said matter.

If you mean other sources of fuel to reach the speed of light than let me clarify: to reach the speed of light you would need an infinitely large source of energy. Since our universe is finite, that is not possible. Too little is known about dark matter/energy for it to hold any real sway in this debate.

Infinitely large is not always the case, fact is, so log as the fuel is infinitely powerful, it is possible to encroach upon Lightspeed. Quanta tunneling may be a good way to forego the "C" Vacuum and the Scharnhorst effect due to the fact that so little cn be proven about it, and that it is not a tachyom. As it is not a form of energy, it is open to discussion. It is also the only true violation of Special Relativety.

EDIT:
If you are reading and are wonder what Dark matter is [theorized] to be, read up on it, i even got you the link. http://math.ucr.edu/home/baez/physic...rk_matter.html