Magnetogenesis from a rotating scalar: \`a la scalar chiral magnetic effect
Abstract
The chiral magnetic effect (CME) is a phenomenon in which an electric current is induced parallel to an external magnetic field in the presence of chiral asymmetry in a fermionic system. In this paper, we show that the electric current induced by the dynamics of a pseudo-scalar field which anomalously couples to electromagnetic fields can be interpreted as closely analogous to the CME. In particular, the velocity of the pseudo-scalar field, which is the phase of a complex scalar, indicates that the system carries a global U(1) number asymmetry as the source of the induced current. We demonstrate that an initial kick to the phase-field velocity and an anomalous coupling between the phase-field and gauge fields are naturally provided, in a set-up such as the Affleck-Dine mechanism. The resulting asymmetry carried by the Affleck-Dine field can give rise to instability in the (electro)magnetic field. Cosmological consequences of this mechanism are also investigated.
Keywords
Cite
@article{arxiv.1905.06966,
title = {Magnetogenesis from a rotating scalar: \`a la scalar chiral magnetic effect},
author = {Kohei Kamada and Chang Sub Shin},
journal= {arXiv preprint arXiv:1905.06966},
year = {2020}
}
Comments
35 pages, 1 figure; v2: extended discussions, comments and references added, matches version accepted for publication in JHEP