Description
Chairman: Vladimír Karas
We will present results for oscillation modes of thick accretion tori in Kerr spacetime using finite-element numerical method. We will derive relativistic version of the Papaloizou-Pringle equation for disks with general angular momentum distribution. Then we focus on the case of constant angular momentum tori and compare our results with those previously found by analytic perturbation methods.
We examine the influence of the quadrupole moment of slowly rotating neutron stars on the oscillations of non-slender accretion tori. We assume a perfect fluid, polytropic, constant specific angular momentum, non-selfgravitating torus and analytically calculate formulas for the oscillation frequencies. So far, these have only been studied in the Kerr geometry. We apply known methods for...
We explore the influence of non-geodesic pressure forces that are present in an accretion disk on the frequencies of its axisymmetric and non-axisymmetric epicyclic oscillation modes. We discuss its implications for models of high-frequency quasi-periodic oscillations (QPOs) that have been observed in the X-ray flux of accreting black holes (BHs) and neutron stars (NSs). In particular, we...