Alfven modes driven non-linearly by metric perturbations in anisotropic magnetized cosmologies

TL;DR

This paper investigates how non-linear interactions between metric perturbations and magnetic fields in anisotropic cosmologies can generate significant electric field perturbations, with implications for early universe and astrophysical phenomena.

Contribution

It demonstrates that non-linear coupling of metric perturbations can induce growing electric field perturbations in anisotropic magnetized cosmologies, a phenomenon absent in linear analysis.

Findings

Non-linear metric perturbations can generate steeply increasing electric fields.

Numerical and analytical methods confirm the non-linear effects.

Sources include quantum vacuum fluctuations and astrophysical processes.

Abstract

We consider anisotropic magnetized cosmologies filled with conductive plasma fluid and study the implications of metric perturbations that propagate parallel to the ambient magnetic field. It is known that in the first order (linear) approximation with respect to the amplitude of the perturbations no electric field and density perturbations arise. However, when we consider the non-linear coupling of the metric perturbations with their temporal derivatives, certain classes of solutions can induce steeply increasing in time electric field perturbations. This is verified both numerically and analytically. The source of these perturbations can be either high-frequency quantum vacuum fluctuations, driven by the cosmological pump field, in the early stages of the evolution of the Universe or astrophysical processes or a non-linear isotropization process of an initially anisotropic cosmological spacetime.