Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-12-08
Phys.Rev. D55 (1997) 7038-7043
Physics
High Energy Physics
High Energy Physics - Phenomenology
6 pages, REVTEX. Factor of 2 correction of final result. Reference updates. To be published in Physical Review D
Scientific paper
10.1103/PhysRevD.55.7038
We calculate the Cherenkov process nu -> nu+photon in the presence of a homogeneous magnetic field. The neutrinos are taken to be massless with only standard-model couplings. The magnetic field fulfills the dual purpose of inducing an effective neutrino-photon vertex and of modifying the photon dispersion relation such that the Cherenkov condition is fulfilled. Our effect is closely related to photon splitting that occurs in magnetic fields and that may be astrophysically important in the strong magnetic fields of pulsars. It is also closely related to magnetic-field enhanced radiative decays nu -> nu'+photon that have been extensively discussed in the recent literature. In the appropriate limits we agree with these results, but we disagree with earlier explicit calculations of the Cherenkov process. For a field strength B_crit = m_e^2/e = 4.41E13 Gauss and for E=2m_e the Cherenkov rate is about 6E-11/sec and thus too small to be of practical importance for pulsar physics.
Ioannisian Ara N.
~Raffelt Georg G.
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