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mass
(redirected from massless)

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Around four per cent of the universe is actually visible; a dark matter of virtually massless neutrinos with no electric charge, along with the even more mysterious dark energy, account for all the rest.
This led some scientists to question whether correlated behavior could even be possible in graphene, where the electrons are massless (ultra-relativistic) particles like photons and neutrinos.
According to the successful standard model describing quantum physics at the shortest observable distances, at even shorter distances (or higher energies) there's a symmetry that requires particles to be effectively massless.
 
 
 
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