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Physics/Particle Physics

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Question
Not sure if this question is up your ally, but here it goes...

Special relativity allows for the existence of Tachyons, the nature of which would be a particle that is always traveling faster than light, speeds up as it looses energy, and cannot react with normal matter.
Is there any possibility this could be the elusive dark energy, the unseen force that is speeding up the expansion of the universe?  I have to say, I've done a good deal of reading on both tachyons and dark energy and it seems the properties of both are very similar in their descriptions.

Answer
There's really nothing about tachyons that would allow them to cause an expansion of the universe. No evidence for tachyons actually exists, and there's no mechanism by which they could cause such expansion of space itself. If you have one to propose, I'm all ears.

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Dr. Stephen O. Nelson

Expertise

I can answer most basic physics questions, physics questions about science fiction and everyday observations of physics, etc. I'm also usually good for science fair advice (I'm the regional science fair director). I do not answer homework problems. I will occasionally point out where a homework solution went wrong, though. I'm usually good at explaining odd observations that seem counterintuitive, energy science, nuclear physics, nuclear astrophysics, and alternative theories of physics are my specialties.

Experience

I was a physics professor at the University of Texas of the Permian Basin, research in nuclear technology and nuclear astrophysics. My travelling science show saw over 20,000 students of all ages. I taught physics, nuclear chemistry, radiation safety, vacuum technology, and answer tons of questions as I tour schools encouraging students to consider careers in science. I moved on to a non-academic job with more research just recently.

Education/Credentials
Ph. D. from Duke University in physics, research in nuclear astrophysics reactions, gamma-ray astronomy technology, and advanced nuclear reactors.

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