Magnetogenesis from a rotating scalar: à la scalar chiral magnetic effect
arXiv:1905.06966 · doi:10.1007/JHEP04(2020)185
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.
35 pages, 1 figure; v2: extended discussions, comments and references added, matches version accepted for publication in JHEP
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- Axion Poltergeist
- Baryogenesis from Decaying Magnetic Helicity in Axiogenesis
- Cosmic Perturbations from a Rotating Field
- Semiclassical analysis of axion-assisted and axion-driven pair production
- R-Parity Violation Axiogenesis