- #1
Lapidus
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So every particle with some mass, even if the mass is very, very close to zero has a rest frame. A neutrino, say, could sit right next to me. But a photon, a massless particle, of course, can't, it has to zip by with light velocity.
But when I would reduce the mass of a particle slowly towards zero, how is this sudden and abrupt change of behaviour, that there is no rest frame anymore for zero mass, explained?
(Which equation shows that best?)
Or does it require more and more energy to keep a ever lighter particle at rest? But then all frames a equal by Lorentz transformation, and there is always a rest frame for a particle which does not move with c...
confused!
thanks
But when I would reduce the mass of a particle slowly towards zero, how is this sudden and abrupt change of behaviour, that there is no rest frame anymore for zero mass, explained?
(Which equation shows that best?)
Or does it require more and more energy to keep a ever lighter particle at rest? But then all frames a equal by Lorentz transformation, and there is always a rest frame for a particle which does not move with c...
confused!
thanks