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Recently, remarkable anti-glitch and glitch accompanied by bright radiobursts of the Galactic magnetar SGR J1935+2154 were discovered. These twoinfrequent temporal coincidences between the glitch/anti-glitch and the fastradio burst (FRB)-like bursts reveal their physical connection of them. Here wepropose that the anti-glitch/glitch and FRB-like bursts can be well understoodby an asteroid tidally captured by a magnetar. In this model, an asteroid istidally captured and disrupted by a magnetar. Then, the disrupted asteroid willtransfer the angular momentum to the magnetar producing a sudden change in themagnetar rotational frequency at the magnetosphere radius. If the orbitalangular momentum of the asteroid is parallel (or anti-parallel) to that of thespinning magnetar, a glitch (or anti-glitch) will occur. Subsequently, thebound asteroid materials fall back to the pericenter and eventually areaccreted to the surface of the magnetar. Massive fragments of the asteroidcross magnetic field lines and produce bright radio bursts through coherentcurvature radiation. Our model can explain the sudden magnetar spin changes andFRB-like bursts in a unified way.

Tidal capture of an asteroid by a magnetar: FRB-like bursts, glitch and anti-glitch