Equilibrium properties of self-interacting neutrinos in the quasi-particle approach
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Equilibrium properties of self-interacting neutrinos in the quasi-particle approach

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Equilibrium properties of self-interacting neutrinos in the quasi-particle approach

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Sirera Tomás, Miguel; Pérez Cañellas, Armando
Aquest document és un/a article, creat/da en: 2004

Este documento está disponible también en : http://dx.doi.org/10.1088/0954-3899/30/9/016
In this work a neutrino gas in equilibrium is studied both at T=0 and at finite temperature. Neutrinos are treated as massive Dirac quasi-particles with two generations. We include self-interactions among the neutrinos via neutral currents, as well as the interaction with a background of matter. To obtain the equilibrium properties we use Wigner function techniques. To account for corrections beyond the Hartree approximation, we also introduce correlation functions. We prove that, under the quasi-particle approximation, these correlation functions can be expressed as products of Wigner functions. We analyze the main properties of the neutrino eigenmodes in the medium, such as effective masses and mixing angle. We show that the formulae describing these quantities will differ with respect to the case with no self-interactions.

    Sirera, M. Pérez Cañellas, Armando 2004 Equilibrium properties of self-interacting neutrinos in the quasi-particle approach Journal of Physics G-Nuclear and Particle Physics 30 1173 1184
http://dx.doi.org/10.1088/0954-3899/30/9/016
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