Physics
Scientific paper
Feb 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995phlb..352..346k&link_type=abstract
Physics Letters B, v. 352, p. 346-356
Physics
1
Scientific paper
We investigate the propagation of a massive Dirac neutrino νe in a background electromagnetic fieldFμλ . In particular we have obtained exact solutions for the Dirac-Schwinger equation with the self-energy operator of the neutrino which involves the effective electron and W-boson propagators allowing for interactions of these particles with an intense electromagnetic background. In the framework of the approach described above, we analyze the dispersion relation for the neutrino and calculate the effects induced by the external field. For example, in the massless case we obtain the following shift of the pole in the neutrino propagator: pμpμ + (g2e2/(6π2M4W)) [ln(MW/(me)) + 3/(8)]pμFμλFλσpσ = 0. The external field impact on the dipole magnetic moment μν of the neutrino is also considered. We find that under certain conditions the magnitude of the static magnetic moment μ0 = (3√2/(16π2))GFemν can be enhanced by the electromagnetic field. However this effect is very small: μν/(μ0) = 1.016148. We also demonstrate the possibility of non-perturbative contributions being non-linear in Fμλ to influence spin precession phenomena. Some applications of these results to astrophysics and cosmology are discussed.
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