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Ultrarelativistic limit for neutrinos: Why is this approximation working?
In this section of the Wikipedia article on neutrino oscillations, a neutrino mass eigenstate $\left|\nu_i\right>$ is written as
$$\left|\nu_i(t)\right> = e^{-i(E_it-\vec p_i\cdot\vec{x})} \left|...
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Massive-ness of Neutrinos as a Consequence of Special Relativistic Kinematics?
As I understand it is still unclear if all neutrinos in the standard model are massive. Neutrino oscillations show that certainly not all neutrinos can be massless, but it might still be the case that ...
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