Kavli Affiliate: Renxin Xu
| First 5 Authors: Rodrigo Negreiros, Chen Zhang, Renxin Xu, ,
| Summary:
We study the rotational properties of inverted hybrid stars (also termed
cross stars), which have been recently proposed as a possible new class of
compact stars characterized by an outer layer of quark matter and a core of
hadrons, in an inverted structure compared to traditional hybrid stars. We
analyze distinct models representing varying depths of quark-hadron phase
transitions. Our findings reveal that, while cross stars rotating at their
Kepler frequencies typically exhibit a significantly higher mass and larger
circumferential radius as anticipated, interestingly, there is a significant
increase in potential twin configurations in the case of rapid rotations. We
further study sequences of constant baryonic mass, representing potential paths
of rotational evolution. Our results indicate that not all stars in these
sequences are viable due to the onset of phase transitions during spin-down,
leading to possible mini-collapses. We also investigate the phenomenon of
“back-bending" during spin-down sequences, which is manifested in a rather
different shape for cross stars due to their inverted structure and the large
density discontinuity caused by the strong phase transition, in contrast to
traditional hybrid stars. Our research enriches existing studies by introducing
the significant aspect of rotation, unveiling intr
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