Neutrino spin evolution in presence of general external fields

Dvornikov, Maxim; Studenikin, Alexander

doi:10.1088/1126-6708/2002/09/016

Cited by 76 publications

(132 citation statements)

References 9 publications

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“…We found out that weak gravitational fields of a rotating source enters the neutrino spin evolution equation as an axial-vector field, that, as it has been shown in [9], produces the spin precession. Then, using the main idea of [10] that a neutrino with spin processing in the external environment should radiate electromagnetic waves, we investigate this spin light of neutrino in gravitational fields in the vicinity of the rotating neutron star, the accretion disk of a rotating black hole and in the relativistic jet of a quasar.…”

Section: Introductionsupporting

confidence: 54%

Spin Light of Neutrino in Gravitational Fields

Dvornikov

Grigoriev

Studenikin

2005

Int. J. Mod. Phys. D

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We predict a new mechanism for the spin light of neutrino (SLν) that can be emitted by a neutrino moving in gravitational fields. This effect is studied on the basis of the quasiclassical equation for the neutrino spin evolution in a gravitational field. It is shown that the gravitational field of a rotating object, in the weak-field limit, can be considered as an axial vector external field which induces the neutrino spin procession. The corresponding probability of the neutrino spin oscillations in the gravitational field has been derived for the first time. The considered in this paper SLν can be produced in the neutrino spin-flip transitions in gravitational fields. It is shown that the total power of this radiation is proportional to the neutrino gamma factor to the fourth power, and the emitted photon energy, for the case of an ultra relativistic neutrino, could span up to gamma-rays. We investigate the SLν caused by both gravitational and electromagnetic fields, also accounting for effects of arbitrary moving and polarized matter, in various astrophysical environments. In particular, we discuss the SLν emitted by a neutrino moving in the vicinity of a rotating neutron star, black hole surrounded by dense matter, as well as by a neutrino propagating in the relativistic jet from a quasar.

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Section: Introductionsupporting

confidence: 54%

Spin Light of Neutrino in Gravitational Fields

Dvornikov

Grigoriev

Studenikin

2005

Int. J. Mod. Phys. D

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“…where G F is the Fermi constant and coefficients q (1) f and q (2) f depend on the types of a neutrino and background fermions [17]. If we deal with electron neutrinos ν e propagating in the matter that is composed of electrons, protons, and neutrons, these coefficients have the form,…”

Section: Interaction Of Dirac Neutrinos With Background Mattermentioning

confidence: 99%

Creation of Dirac neutrinos in a dense medium with a time-dependent effective potential

2014

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We consider Dirac neutrinos interacting with background fermions in the frame of the standard model. We demonstrate that a time-dependent effective potential is quite possible in a protoneutron star (PNS) at certain stages of its evolution. For the first time, we formulate a nonperturbative treatment of neutrino processes in a matter with arbitrary time-dependent effective potential. Using linearly growing effective potential, we study the typical case of a slowly varying matter interaction potential. We calculate differential mean numbers of νν pairs created from the vacuum by this potential and find that they crucially depend on the magnitude of masses of the lightest neutrino eigenstate. These distributions uniformly span up to ∼ 10 eV energies for muon and tau neutrinos created in PNS core due to the compression just before the hydrodynamic bounce and up to ∼ 0.1 eV energies for all three active neutrino flavors created in the neutronization. Considering different stages of the PNS evolution, we derive constraints on neutrino masses, mν (10 −8 − 10 −7 ) eV, corresponding to the nonvanishing νν pairs flux produced by this mechanism. We show that one can distinguish such coherent flux from chaotic fluxes of any other origin. Part of these neutrinos, depending on the flavor and helicity, are bounded in the PNS, while antineutrinos of any flavor escape the PNS. If the created pairs are νeνe, then a part of the corresponding neutrinos also escape the PNS. The detection of ν andν with such low energies is beyond current experimental techniques.

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“…from the conditions of the constraint conservation 15) where { } are the generalized Poisson brackets, see Ref. [14].…”

Section: Classical and Quantum Theory Of A Free Massive Weyl Fieldmentioning

confidence: 99%

“…The explicit form of U µ can be found in Ref. [15]. The nonperturbative analysis of the complete system (4.1) which includes the nonzero, nondiagonal interaction with the background matter and electromagnetic field, is difficult to perform.…”

Section: Massive Weyl Neutrinos In External Fieldsmentioning

confidence: 99%

Canonical quantization, path integral representations, and pseudoclassical description of massive Weyl neutrinos in external backgrounds

Dvornikov

Гитман

2013

Phys. Rev. D

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We study massive 1/2-spin particles in various external backgrounds keeping in mind applications to neutrino physics. We are mainly interested in massive Majorana (Weyl) fields. However, massive neutral Dirac particles are also considered. We formulate classical Lagrangian theory of the massive Weyl field in terms of Grassmann-odd two-component spinors. Then we construct the Hamiltonian formulation of such a theory, which turns out to be a theory with second-class constraints. Using this formulation we canonically quantize the massive free Weyl field. We derive propagators of the Weyl field and relate them to the propagator of a massive Dirac particle. We also study the massive Weyl particles propagating in the background mater. We find the path integral representation for the propagator of such a field, as well as the corresponding pseudoclassical particle action. The massless limit of the Weyl field interacting with the matter is considered and compared with results of other works. Finally, the path integral representation for the propagator of the neutral massive Dirac particle with an anomalous magnetic moment moving in the background matter and external electromagnetic field, as well as the corresponding pseudoclassical particle action are constructed.

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Neutrino spin evolution in presence of general external fields

Cited by 76 publications

References 9 publications

Spin Light of Neutrino in Gravitational Fields

Spin Light of Neutrino in Gravitational Fields

Creation of Dirac neutrinos in a dense medium with a time-dependent effective potential

Canonical quantization, path integral representations, and pseudoclassical description of massive Weyl neutrinos in external backgrounds

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