Vacuum Magnetic Moment Research Articles

Synchrotron radiation in the standard model extension

We obtain a system of exact solutions of the Dirac equation for an electron moving in a constant homogeneous external magnetic field with an account of its vacuum magnetic moment and assumed Lorentz invariance violation in the minimal CPT-odd form in the framework of the standard model extension. Using these solutions, characteristics of the particle synchrotron radiation are calculated, and possible observable effects caused by the Lorentz non-invariant interaction are described. We demonstrate that the angular distribution of the radiation has specific asymmetry, which can be explained as a consequence of non-conservation of transversal electron polarization in the presence of a background Lorentz non-invariant condensate field.

Electromagnetic interactions and chirality flip of neutrinos in a thermal background

We investigate the finite temperature and density effects on the electromagnetic properties of neutrinos. For a standard model neutrino we find a left-handed effective charge and a chirality flipping term associated with the longitudinal photon exchange. We find that in the supernova the chirality flipping rate is two orders of magnitude larger than the previous estimates using the vacuum magnetic moment.

Helicity flip of a neutrino in vℓ scattering in the extended electroweak model with an SU L(2) charged singlet

In the electroweak model with a charged scalar SU L(2) singlet we have calculated the cross section for scattering of an anti-neutrino by leptons with helicity flip ( v ̃ +ℓ→ v ̃ −ℓ ), which considerably (by more than five orders of magnitude under the conditions described below) exceeds the cross section for v ̃ ℓ scattering in an electromagnetic channel, which is due to the existence of a vacuum magnetic moment of the neutrino. New cosmological restrictions on the constants of the model used, ƒ ab and g ab , have been obtained.

Generation of mass and change of the neutrino helicity in a medium in the presence of right currents

In the symmetric SUL(2)⊗SUR(2)⊗U(1) model of electroweak interactions the Dirac neutrino possesses in a medium effective mass, even in the absence of vacuum rest mass (mvvac = 0). As a result the neutrino in such a model has always a four-component wave function in the medium. The left neutrino, produced in a nuclear reaction, becomes right in the material in elastic scattering from nuclei, and more efficiently than in the same process when taking into account the anomalous vacuum magnetic moment.

Influence of the vacuum magnetic moment on the induced radiation of an electron in a plane wave

Expressions are obtained for the probability and intensity of induced radiation from an electron with a vacuum magnetic moment moving in a plane electromagnetic wave of small amplitude. The wave is supposed to be monochromatic and to have random polarization. The results of previous publications on this subject [4–6] are included here as special cases.

Vacuum magnetic moment of an electron moving in a uniform magnetic field

The methods of quantum electrodynamics are used to study the dependence of the vacuum magnetic moment of the electron on its energy and on the magnetic field intensity. This dependence is most important in the case of strong magnetic fields. For an ultrarelativistic electron, the vacuum magnetic moment turns out to depend on the electron energy, even in a weak magnetic field.

Motion and radiation of an electron exhibiting a vacuum magnetic moment in the field of a plane electromagnetic wave

A study is made of the motion of an electron exhibiting an anomalous magnetic moment and moving in the field of a plane circularly polarized electromagnetic wave. An exact solution is found to the generalized Dirac equation and is utilized to study the emission of electromagnetic radiation from the electron (the Compton effect). It is shown that allowance for the anomalous magnetic moment of the electron leads to: a frequency shift, a change in the total radiated power, polarization of the radiation, and to spin effects.