Cerenkov radiation by neutrinos in a supernova core

Details Cerenkov radiation by neutrinos in a supernova core Cerenkov radiation by neutrinos in a supernova core

1995-06-21

arxiv.org/abs/hep-ph/9506385v2

Phys.Rev.Lett. 77 (1996) 806-809

Physics

High Energy Physics

High Energy Physics - Phenomenology

Revised version to appear in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.77.806

Neutrinos with a magnetic dipole moment propagating in a medium with a velocity larger than the phase velocity of light emit photons by the Cerenkov process. The Cerenkov radiation is a helicity flip process via which a left-handed neutrino in a supernova core may change into a sterile right-handed one and free-stream out of the core. Assuming that the luminosity of such sterile right-handed neutrinos is less than $10^{53}$ ergs/sec gives an upper bound on the neutrino magnetic dipole moment $\mu_\nu < 0.2 \times 10^{-13} \mu_B$. This is two orders of magnitude more stringent than the previously established bounds on $\mu_\nu$ from considerations of supernova cooling rate by right-handed neutrinos.

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