Anomaly-driven inverse cascade and inhomogeneities in a magnetized chiral plasma in the early Universe

E. V. Gorbar, I. Rudenok, Igor Shovkovy, S. Vilchinskii

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

By making use of a simple model that captures the key features of the anomalous Maxwell equations, we study the role of inhomogeneities on the evolution of magnetic fields in a chiral plasma. We find that inhomogeneities of the chiral asymmetry by themselves do not prevent the anomaly-driven inverse cascade and, as in the homogeneous case, the magnetic helicity is transferred from shorter to longer wavelength helical modes of the magnetic field. However, we also find that the evolution appears to be sensitive to the effects of diffusion. In the case when diffusion is negligible, the inverse cascade slows down considerably compared to the homogeneous scenario. In the case of the primordial plasma, though, we find that the diffusion is substantial and efficiently suppresses chiral asymmetry inhomogeneities. As a result, the inverse cascade proceeds practically in the same way as in the chirally homogeneous model.

Original languageEnglish (US)
Article number103528
JournalPhysical Review D
Volume94
Issue number10
DOIs
StatePublished - Nov 28 2016

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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