Quark stars within relativistic models

Lately, it has been suggested that strange (quark) stars can be responsible for glitches and other observational features of pulsars. Whether quark stars, if they really exist, are bare or crusted is a source of controversy in the recent literature. In the present work we use the Nambu–Jona–Lasinio model, known to incorporate chiral symmetry, necessarily present in the QCD formalism, in order to describe quark star properties. We compare our results for the stars and the features of the model with the much simpler model normally used in the description of strange stars, namely the MIT bag model. We also investigate the differences in the stellar properties which arise due to the presence of the crust. We show that the NJL model produces results which are somewhat different from the MIT model.