Do many-particle neutrino interactions cause a novel coherent effect?

Details Do many-particle neutrino interactions cause a novel coherent effect? Do many-particle neutrino interactions cause a novel coherent effect?

2003-07-10

arxiv.org/abs/hep-ph/0307140v1

JHEP 0310:043,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

25 pages, 1 figure

Scientific paper

10.1088/1126-6708/2003/10/043

We investigate whether coherent flavor conversion of neutrinos in a neutrino background is substantially modified by many-body effects, with respect to the conventional one-particle effective description. We study the evolution of a system of interacting neutrino plane waves in a box. Using its equivalence to a system of spins, we determine the character of its behavior completely analytically. We find that, if the neutrinos are initially in flavor eigenstates, no coherent flavor conversion is realized, in agreement with the effective one-particle description. This result does not depend on the size of the neutrino wavepackets and therefore has a general character. The validity of the several important applications of the one-particle formalism is thus confirmed.

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