Speaker
Description
Confronting observational measurements with theoretical models of neutron star spacetimes presents several challenges. These are particularly pronounced due to the differences in the definitions of measurable physical quantities and the quantities commonly used to define the spacetime metric, with the dependence of these quantities on the NS equation of state playing a major role. Here, we make use of the universal relations between NS parameters that were previously found through empirical means. We demonstrate how these relations can be utilised to obtain neutron star parameters from observed kilohertz quasi-periodic oscillations, provided the NS spin frequency is known. We adopt two models as examples: one based on the orbital motion of accreted inhomogeneities and one based on the oscillations of inner accretion tori.