The glitch recovery in the strangeon star model

Lai, Xiaoyu

Pulsar glitch, as a useful probe for studying the interior structure of pulsars, has been studied in strangeon star model, including the recovery coefficient, the waiting time of glitches and glitch activity. In this talk, the recovery process of a glitch is described in the strangeon star model, based on the starquake scenario established before. After the starquake, the inner motion of the stellar matter would reduce the tangential pressure in the cracked places at the equatorial plane. The recovery (increase) of the tangential pressure would be achieved by a viscous flow towards the cracked places at equatorial plane, which leads to the exponential recovery of the spin frequency. A uniform viscous flow can reproduce the single exponential decay observed in some glitches, which can be generalized to two or more exponentials by a multi-component of viscous flows. The magnitude of the exponential decay can also be explained in strangeon star model.