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Rates of neutrino conversion and decay in hot and dense QED plasma

N. Asida·A. Niégawa·H. Ozaki·M. Kubota
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Abstract

Using a real-time formalism of equilibrium and nonequilibrium quantum-field theory, we derive the reaction-rate formula for neutrino-conversion ($ν\to ν'$) process and $ν\barν'$ annihilation process, which take place in a hot and dense QED plasma with background (anti)neutrinos out of equilibrium. Also derived is the formula for the inverse processes to the above ones. Using the hard-thermal-loop resummation scheme, we include the contribution from the coherent processes. The decay/production of a neutrino causes an evolution of its spatial distribution. A scheme for dealing with this evolution is presented. For the case of isotropic neutrino distribution, numerical computation is carried out for the parameter region of type-II super-nova explosion. Defferential reaction rate exhibits characteristic peak structure, which comes from the coherent processes. The contribution from the above processes to the decay or damping rate of a parent neutrino $ν$ is also studied.

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N. Asida, A. Niégawa, H. Ozaki, M. Kubota. 2001-11-15. Rates of neutrino conversion and decay in hot and dense QED plasma. https://doi.org/10.1103/physrevd.65.056007

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