Details

Autor(en) / Beteiligte

• Nieves, José F.
• Sahu, Sarira

Titel

Neutrino propagation in an electron background with an inhomogeneous magnetic field

Ist Teil von

• The European physical journal. C, Particles and fields, 2018-07, Vol.78 (7), p.1-17, Article 547

Ort / Verlag

Berlin/Heidelberg: Springer Berlin Heidelberg

Erscheinungsjahr

2018

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We study the electromagnetic coupling of a neutrino that propagates in a two-stream electron background medium. Specifically, we calculate the electromagnetic vertex function for a medium that consists of a normal electron background plus another electron stream background that is moving with a velocity four-vector v μ relative to the normal background. The results can be used as the basis for studying the neutrino electromagnetic properties and various processes in such a medium. As an application, we calculate the neutrino dispersion relation in the presence of an external magnetic field ( B ), focused in the case in which B is inhomogeneous, keeping only the terms of the lowest order in 1 / m W 2 and linear in the B and its gradient. We show that the dispersion relation contains additional anisotropic terms involving the derivatives of B , such as the gradient of k ^ · ( v × B ) , which involve the stream background velocity, and a term of the form k ^ · ( ∇ × B ) that can be present in the absence of the stream background, in addition to a term of the form k ^ · v and the well known term k ^ · B that arises in the constant B case. The derivative-dependent terms are even under a CP transformation. As a result, in contrast to the latter two just mentioned, they depend on the sum of the particle and antiparticle densities and therefore can be non-zero in a CP -symmetric medium in which the particle and antiparticle densities are equal.