Properties of rotating neutron stars in light of binary compact object mergers

Abstract

The properties of rotating neutron stars are investigated using eight equations of state (EOSs). We also study the relations between various observables corresponding to different angular velocities for all those EOSs. All of these EoSs lead to non-rotating compact stars with maximum masses between 1.8 to 2.25 M ⊙ . We calculate the moment of inertia and studied its variation with mass and the relation between central energy density and angular momentum. We compare our results with the observational findings from the most massive pulsar PSR J0740+6620 and the heaviest secondary component in the black hole -neutron star merger GW190814. It is noted that the secondary compact object of GW190814 having mass ∼ 2.6M ⊙ might be explained as a rapidly rotating neutron star (NS) with frequency larger than 1000 Hz.