For tachyons to go slower than the speed of light do they need an infinite amount of negative energy? What is negative energy?

Also, how come charged tachyons can be theoretically detected by the subluminal materials of Cerenkov radiation? Isn't the tachyon's charge superluminal too?

Please if someone can help me or give me a link to understand tachyons better I'd be really appreciative
Chris

2.

3. Hi glenk.

I am not qualified enough to answer this in detail, however, a quick wiki search yeilded this:

"In special relativity, a faster than light particle would have space-like four-momentum,[1] in contrast to ordinary particles that have time-like four-momentum. It would also have imaginary mass. Being constrained to the spacelike portion of the energy-momentum graph, it could not slow down to subluminal speeds." Tachyon - Wikipedia, the free encyclopedia

So, according to this, that particle can't go slower than superluminal speeds. As I understand it, it would need an infinite amount of energy just to slow down to the speed of light. And if it did reach the speed of light, it would be destroyed. Somehow. Not sure how.

And for question 2:

"While electrodynamics holds that the speed of light in a vacuum is a universal constant (c), the speed at which light propagates in a material may be significantly less than c. For example, the speed of the propagation of light in water is only 0.75c. Matter can be accelerated beyond this speed (although still to less than c) during nuclear reactions and in particle accelerators." Cherenkov radiation - Wikipedia, the free encyclopedia

And I do believe that Cherenkov Radiation can be detected. Not just theoretically.

Hope this helps.

4. Other than on the Star Trek science fictional series, I wasn't aware tachyons existed in the natural world.

5. That's the thing, they don't. Or at least, we haven't found a way to prove their existance yet.

6. Originally Posted by glenk
For tachyons to go slower than the speed of light do they need an infinite amount of negative energy? What is negative energy?
To slow down to the speed of light would require infinite energy. Tachyons cannot travel at or slower than the speed of light for the same reasons normal matter can't travel at or faster.

I don't think negative energy is involved. Although the rest mass of a particle travelling faster than light would have to be imaginary.

So it seems that tachyons and negative energy are equally likely to [not] exist.

Also, how come charged tachyons can be theoretically detected by the subluminal materials of Cerenkov radiation? Isn't the tachyon's charge superluminal too?
Cherenkov radiation is caused when a charged particle travels faster than the speed of light in a medium. As tavchyons (if they existed) would travel faster than light they would emit Cherenkov radiation. Note that this would cause the particle to lose energy and hence accelerate.

Please if someone can help me or give me a link to understand tachyons better I'd be really appreciative
The Wikipedia page seems to be reasonable: Tachyon - Wikipedia, the free encyclopedia

Note that just because tachyons can be described mathematically does not mean they exist.

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