On classical description of radiation from neutral fermion with anomalous magnetic moment

Lobanov, A. E.; Павлова, О. С.

doi:10.1016/s0375-9601(00)00471-0

Cited by 6 publications

(5 citation statements)

References 15 publications

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“…The properties of spin light were investigated basing upon the quasi-classical theory of radiation and self-polarization of neutral particles [5,6] with the use of the Bargmann-Michel-Telegdi (BMT) equation [7] and its generalizations [8,9]. This theory is valid when the radiated photon energy is small as compared with the neutrino energy, and this narrows the range of astrophysical applications of the obtained formulas.…”

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confidence: 99%

High energy neutrino spin light

Lobanov

2005

Physics Letters B

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The quantum theory of spin light (electromagnetic radiation emitted by a Dirac massive neutrino propagating in dense matter due to the weak interaction of a neutrino with background fermions) is developed. In contrast to the Cherenkov radiation, this effect does not disappear even if the medium refractive index is assumed to be equal to unity. The formulas for the transition rate and the total radiation power are obtained. It is found out that radiation of photons is possible only when the sign of the particle helicity is opposite to that of the effective potential describing the interaction of a neutrino (antineutrino) with the background medium. Due to the radiative self-polarization the radiating particle can change its helicity. As a result, the active left-handed polarized neutrino (right-handed polarized antineutrino) converting to the state with inverse helicity can become practically ``sterile''. Since the sign of the effective potential depends on the neutrino flavor and the matter structure, the spin light can change a ratio of active neutrinos of different flavors. In the ultra relativistic approach, the radiated photons averaged energy is equal to one third of the initial neutrino energy, and two thirds of the energy are carried out by the final ``sterile'' neutrinos.Comment: 12 pages, Latex. To appear in Phys. Lett.

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High energy neutrino spin light

Lobanov

2005

Physics Letters B

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“…where H µ denotes µ 0 H µν u ν . If we average over the initial spin states and summarize over the final ones in expressions ( 21) and ( 22), for which purpose we must set S µ i = S µ f = 0, we obtain the angular distribution and total radiation power of unpolarized fermion [13,14]. If we set S µ i = S µ f = S µ in formulas ( 21) and ( 22) and divide the obtained expression by 2, we obtain the angular distribution and total radiation power without spin flip.…”

Section: General Relationsmentioning

confidence: 99%

“…In our papers [13,14] radiation of unpolarized neutral particles was investigated in quasi-classical approach in the case of arbitrary field. To study radiation from an unpolarized particle one must impose an additional requirement that consists in averaging over the initial spin states and summing over the final polarizations.…”

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Radiation and self-polarization of neutral fermions in quasi-classical description

Lobanov¹

2006

J. Phys. A: Math. Gen.

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A Lorentz invariant formalism for quasi-classical description of electromagnetic radiation from a neutral spin 1 / 2 particle with an anomalous magnetic moment moving in an external electromagnetic field is developed. In the high symmetry fields, for which analytical solutions to the Bargmann-Michel-Telegdi equation are known, the so called self-polarization axes, i. e. directions of preferred polarization of particles in the radiation process, are found. Expressions for the radiative transition probability and spectral-angular distribution of the radiation emitted by a polarized particle are obtained in the fields under consideration.

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“…The properties of the "spin light" were investigated basing upon the quasi-classical theory of radiation and self-polarization of neutral particles [4,5] with the use of the Bargmann-Michel-Telegdi equation [6] and its generalizations [7,8]. This theory is valid when the radiated photon energy is small as compared with the neutrino energy, and this narrows the range of astrophysical applications of the obtained formulas.…”

mentioning

confidence: 99%

Radiative transitions of high-energy neutrinos in a dense medium

Lobanov

2005

Dokl. Phys.

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The quantum theory of the "spin light" (electromagnetic radiation emitted by a massive neutrino propagating in dense matter due to the weak interaction of a neutrino with background fermions) is developed. In contrast to the Cherenkov radiation, this effect does not disappear even if the medium refractive index is assumed to be equal to unity. The formulas for the transition rate and the total radiation power are obtained. It is found out that radiation of photons is possible only when the sign of the particle helicity is opposite to that of the effective potential describing the interaction of a neutrino (antineutrino) with the background medium. Due to the radiative self-polarization the radiating particle can change its helicity.As a result, the active left-handed polarized neutrino (right-handed polarized antineutrino) converting to the state with inverse helicity can become practically "sterile". Since the sign of the effective potential depends on the neutrino flavor and the matter structure, the "spin light" can change a ratio of active neutrinos of different flavors. In the ultra relativistic approach, the radiated photons averaged energy is equal to one third of the initial neutrino energy, and two thirds of the energy are carried out by the final "sterile" neutrinos. This fact can be important for the understanding of the "dark matter" formation mechanism on the early stages of evolution of the Universe.A massive neutrino propagating in dense matter can emit electromagnetic radiation due to the weak interaction of a neutrino with background fermions [1,2]. As a result of the radiation, neutrino can change its helicity due to the radiative self-polarization. In contrast to the Cherenkov

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On classical description of radiation from neutral fermion with anomalous magnetic moment

Cited by 6 publications

References 15 publications

High energy neutrino spin light

High energy neutrino spin light

Radiation and self-polarization of neutral fermions in quasi-classical description

Radiative transitions of high-energy neutrinos in a dense medium

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