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

CAMILA RODRÍGUEZ; IGNACIO FRANCISCO RANEA SANDOVAL; MAURO MARIANI; GERMÁN MALFATTI; OCTAVIO MIGUEL GUILERA

Congreso; IWARA 2020 Video Conference; 2020

The detection of event GW170817 and its electromagnetic counterpart started theera of multi-messenger astronomy with gravitational waves. The observational con-straints from this event and the estimation of mass and radius of PSR J0030+0451 arebeing used to get insights related to the nature of matter inside these compact objects.In this work, we construct hybrid equations of state using modern parametrisationsof the relativistic mean field model for the outer core and a generalisation of theConstant Speed of Sound parametrisation that allow to study sharp sequential phasetransitions in the inner core. Moreover, we study non-radial perturbations of thesestellar configurations using the relativistic Cowling approximation. We focus ourattention on the g-modes that arise due to the sharp phase transitions and show that,due to the second phase transition, a new g-mode appear, g 2 -mode, with frequenciessmaller that ∼ 0.5 kHz.