L.A. Vassilevskaya

Radiative decay of the massive neutrino in external electromagnetic fields

The radiative decay of the massive neutrino {nu}{sub {ital i}}{r_arrow}{nu}{sub {ital j}}{gamma} is investigated in the framework of the standard model in external electromagnetic fields of various configurations: constant crossed field, constant uniform magnetic field, plane monochromatic wave{close_quote}s field. The effect of significant enhancement of the neutrino decay probability by the external field (electromagnetic catalysis) is discussed. An especially strong enhancement occurs in the case of the ultrarelativistic neutrino decay, since in this case the decay probability does not contain suppression caused by the smallness of the decaying neutrino mass. The ultrarelativistic neutrino decay catalysis is significant even in a relatively weak external field ({ital F}/{ital F}{sub {ital e}}{lt}1, where {ital F}{sub {ital e}} is the critical Schwinger value). The expression for the photon splitting probability into a neutrino pair {gamma}{r_arrow}{nu}{sub {ital i}}{bar {nu}}{sub {ital j}} in the wave field is given. The estimations of a number of {gamma} quanta produced in a volume filled with an electromagnetic field and the neutrino lifetime in a strong magnetic field are presented. {copyright} {ital 1996 The American Physical Society.}

The magnetic catalysis of the radiative decay of a massive neutrino in the standard model with lepton mixing

Abstract The radiative decay of the massive neutrino in a magnetic field is analysed in detail in the framework of the standard model with lepton mixing. The phenomenon of a magnetic catalysis of the decay is discovered. The magnetic catalysis is significant in a strong magnetic field ( B⪢B e =m e 2 e≅4.41 × 10 13 G ) ;the effect is more pronounced in the case of the decay of an ultrarelativistic neutrino ( E v ⪢ m v ), even in a relatively weak electromagnetic field ( ϵB⪡m e 2 e ) .

Resonance neutrino bremsstrahlung ν → νγ in a strong magnetic field

Abstract High energy neutrino bremsstrahlung ν → ν + γ in a strong magnetic field (B ⪢ Bs) is studied in the framework of the Standard Model (SM). A resonance probability and a four-vector of the neutrino energy and momentum loss are presented. A possible manifestation of the neutrino bremsstrahlung in astrophysical cataclysm of type of a supernova explosion or a merger of neutron stars, as an origin of cosmological γ-burst is briefly discussed.

Axion decay a → ff in a strong magnetic field

Abstract The axion decay into charged fermion-antifermion pair a → f f is studied in external crossed and magnetic fields. The result we have obtained can be of use to re-examine the lower limit on the axion mass in case of possible existence of strong magnetic fields at the early Universe stage.

Electromagnetic catalysis of the radiative decay of the axion

Abstract The radiative decay of the axion a → γγ is investigated in an external electromagnetic field in DFSZ model in which axion couples to both quarks and leptons at tree level. The decay probability is strongly catalyzed by the external field, namely, the field removes the main suppression caused by the smallness of the axion mass.

Electromagnetic catalysis of the radiative transitions of vi → vjγ type in the field of an intense monochromatic wave

The radiative decay of the massive neutrino

Photon splitting γ→νν̄ in an external magnetic field

\nu_i \rightarrow \nu_j \gamma

Axion emission by magnetic-field induced conversion of longitudinal plasmons

in a circularly polarized electromagnetic wave is investigated within the Standard theory with lepton mixing. The decay probability in the wave field does not contain a threshold factor

The radiative decay of a high energy neutrino in the Coulomb field of a nucleus

\sim ( 1 - m_i / m_j )

Photon splitting

as opposed to the decay probability in a vacuum or in a constant uniform external field. The phenomenon of the gigantic enhancement (