Engineering News

There seems to be reliable evidence that neutrinos have mass, yet still move at the speed of light. They have some form of mass but without violating the relativistic principle that any particle with mass cannot travel at the speed of light or it's mass becomes 'infinite'.

So, what is this mass called? Virtual mass? Dark mass?

If this mass is dark mass, I wonder if it's possible that all other particles, baryons as well as leptons, also posses some amount of dark mass? And if all particles posses this same amount of mass, would this be a sufficient amount of mass to account for the missing mass in the universe? I wonder if photons also posses this same kind of mass but since there is only one kind of photon, it doesn't morph as is moves (or it morphs, but just into itself).

This is just idle speculation. If anyone has any articles or books that discuss these notions, I'd appreciate some links.

As I understand it, the known timing errors are in the order of ±10 ns on a total neutrino travel time of 2439098 ns, which is about two parts in 10⁵. The actual average measurement of seven events was only 0.3 ns from light. With the measurement uncertainty, it makes neutrinos traveling exactly at c possible, but the statistical bias is towards just below c, making a very small mass most likely.

http://arxiv.org/abs/1203.3433

-J

Particles than have mass and that move at the speed of light have 'zero rest-mass', that is they have no mass at any speed lower than that of light. Such particles can ONLY move at the speed of light.

Same thing for photons, which have mass, momentum, and zero rest-mass.

...uh, maybe they'll be called "fast mass?"

an error that shake scientist community.