Discontinuity g modes of hybrid stars: Effect of sequential phase transitions

RODRÍGUEZ, MARIA CAMILA; RANEA-SANDOVAL, IGNACIO F.; MARIANI, MAURO; MALFATTI, GERMÁN; GUILERA, OCTAVIO M.

Virtual

Workshop; 9th International Workshop on Astronomy and Relativistic Astrophysics: from Quarks to Cosmos.; 2020

The detection of event GW170817 and its electromagnetic counterpart startedthe era of multi-messenger astronomy with gravitational waves. The observational constraints from this event and the estimation of mass and radius of PSRJ0030+0451 is being used to get insights related to the nature of matter insidethese compact objects. In this work, we construct hybrid equations of state usingmodern parametrizations of the relativistic mean field model for the outer coreand a generalization of the Constant Speed of Sound parametrization that allowto study sharp sequential phase transitions in the inner core. Moreover, westudy non-radial perturbations of these stellar configurations using the relativistic Cowling approximation. We focus our attention on the g-modes that arise dueto the sharp phase transitions and show that, due to the second phase transition,a new g-mode appears, g2-mode, with frequencies smaller that ∼0.5 kHz