Neutron Star Glitch - Revisiting Starquake Model*

Neutron stars are observed to have sudden jumps in angular velocity, known as glitches, where they are supposed to only simply spin down over time. The starquake model [1] is one of the proposals attempting to explain this glitch by connecting it with the breaking of the neutron star's crust. This project revisits the starquake model by considering neutron stars with more updated microphysics, from which we search for connections with neutron star observables. Expanding on previous studies, in this talk we present new starquake models by considering realistic nuclear EOS [2], detailed neutron star profiles, and updated shear modulus of nuclear crust. With data from 75 observed glitch events, we were able to identify events that can be associated with the starquake model.  We further examine the dependence of the startquake model on some model parameters. This project suggests an alternative way to derive neutron star observables through neutron star glitch events.

[1] G. Baym and D. Pines, Annals of Physics 66, 816 (1971).

[2] A. F. Fantina, N. Chamel, J. M. Pearson, and S. Goriely, 559, A128 (2013).