Fast Radio Bursts as crustal dynamical events induced by magnetic field evolution in young magnetars

TL;DR

This paper proposes a model where repeating Fast Radio Bursts originate from magnetic field-induced crustal events in young magnetars, linking radio and X-ray emissions and exploring gravitational wave signals.

Contribution

It introduces a detailed model connecting magnetar crustal dynamics with FRB emission, including energetics, radiation mechanisms, and gravitational wave predictions.

Findings

Reconnection behind X-ray emission is tentatively linked to FRB events.

Quantification of gravitational radiation from magnetar events.

Analysis of non-linear soliton solutions in the crustal dynamics.

Abstract

We revisit in this work a model for repeating Fast Radio Bursts based of the release of energy provoked by the magnetic field dynamics affecting a magnetar's crust. We address the basics of such a model by solving the propagation of the perturbation approximately, and quantify the energetics and the radiation by bunches of charges in the so-called {\it charge starved} region in the magnetosphere. The (almost) simultaneous emission of newly detected X-rays from SGR 1935+2154 is tentatively associated to a reconnection behind the propagation. The strength of $f$-mode gravitational radiation excited by the event is quantified, and more detailed studies of the non-linear (spiky) soliton solutions suggested.