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I've heard that it is thought that Neurinos are massless paricles, but I'm now hearing that they have kinetic energy.
Can something with no mass have kinetic energy?
Can something with no mass have kinetic energy?
Hi there.zefram_c said:Kinetic energy is a classical concept that has little use in a relativistic framework. Good quantities to use are rest energy (Lorentz invariant) and total energy (Lorentz covariant). ....
Ooops, sorry. My terminology was very sloppy on that one. I meant that the four-momentum transforms as a Lorentz vector between frames of reference. This would not be true for the kinetic energy, which would transform in a more complicated manner.nrqed said:Could you tell me what you mean by a quantity being "covariant"?
I thought that "covariant" made only sense when referring to an *equation*, not a quantity. An equation is covariant when the two sides transform the same way under Lorentz transformations (in SR) or general coordinate transformations (in GR).
Neutrinos are definitly not massless, they have a rest mass. Particles with no rest mass, for example photons, DO have energy, which can be calculated by using the equation...colinr said:I've heard that it is thought that Neurinos are massless paricles, but I'm now hearing that they have kinetic energy.
Can something with no mass have kinetic energy?