Constraining mechanism associated with fast radio burst and glitch from SGR J1935

TL;DR

This paper explores potential mechanisms linking fast radio bursts and glitches in SGR J1935, constraining glitch sizes through energy considerations and proposing observational criteria to differentiate models.

Contribution

It provides order of magnitude estimates for glitch sizes associated with various FRB mechanisms and suggests how future observations can distinguish these models.

Findings

Maximum glitch sizes vary by orders of magnitude across mechanisms.

Glitch behaviors can serve as criteria to identify underlying mechanisms.

Energy constraints limit the possible glitch sizes for each model.

Abstract

The discovery of fast radio burst (FRB) 200428 from galactic SGR J1935+2154 makes it possible to measure rotational changes accompanied by FRBs and to test several FRB models which may be simultaneously associated with glitches. Inspired by this idea, we present order of magnitude calculations to the scenarios proposed. FRB models such as global starquakes, crust fractures and collisions between pulsars and asteroids/comets are discussed. For each mechanism, the maximum glitch sizes are constrained by the isotropic energy release during the X-ray burst and/or the SGR J1935+2154-like radio burst rate. Brief calculations show that, the maximum glitch sizes for different mechanisms differ by order(s) of magnitude. If glitches are detected to be coincident with FRBs from galactic magnetars in the future, glitch behaviors (such as glitch size, rise timescale, the recovery coefficient and spin down rate offset) are promising to serve as criterions to distinguish glitch mechanisms and in turn to constrain FRB models.