Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-09-18
Astronomy and Astrophysics
Astrophysics
20 pages, 7 figures, Submitted to ApJ
Scientific paper
The system of neutrino-antineutrino $(\nu\bar{\nu})$ - plasma is considered taking into account their weak Fermi interaction. New fluid instabilities driven by strong neutrino flux in a plasma are found. The nonlinear stationary as well as nonstationary waves in the neutrino gas are discussed. It is shown that a bunch of neutrinos, drifting with a constant velocity across a homogeneous plasma, can also induce emission of lower energy neutrinos due to scattering, i.e. the decay of a heavy neutrino $\nu_{H}$ into a heavy and a light neutrino $\nu_L$ ($\nu_H\to\nu_H\nu_L$) in a plasma. Furthermore we find that the neutrino production in stars does not lead in general to energy losses from the neutron stars.
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