Neutrino mixing contribution to the cosmological constant

Description

We show that the non-perturbative vacuum structure associated with neutrino mixing leads to a non-zero contribution to the value of the cosmological constant. Such a contribution comes from the specific nature of the mixing phenomenon. Its origin is completely different from the one of the ordinary contribution of a massive spinor field. We estimate this neutrino mixing contribution by using the natural cut-off appearing in the quantum field theory formalism for neutrino mixing and oscillation. © 2004 Elsevier B.V. All rights reserved.

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