Oscillation properties of relativistic tori in the vicinity of a distorted deformed compact object

TL;DR

This study analyzes the oscillation characteristics of relativistic tori around a distorted, deformed compact object, focusing on how quadrupole parameters influence frequencies and their potential link to observed high-frequency QPOs.

Contribution

It introduces an analytical model for relativistic tori oscillations in a complex gravitational field with quadrupole deformations, extending previous test particle analyses.

Findings

Oscillation frequencies depend on quadrupole parameters and angular momentum distribution.

The model relates torus oscillations to high-frequency QPOs observed in astrophysical data.

Analytical treatment of relativistic tori in a deformed gravitational background.

Abstract

This paper studies the oscillation properties of relativistic, non-self-gravitating tori in the background of a distorted deformed compact object. This work concentrates on the static and axially symmetric metric containing two quadrupole parameters; relating to the central object and the external fields. This metric may associate the observable effects to these parameters as dynamical degrees of freedom. The astrophysical motivation for choosing such a field is the possibility of constituting a reasonable model for an actual scenario occurring in the vicinity of compact objects. This paper aims to investigate the radial epicyclic frequency in a perfect fluid disk and not a test particle scenario via a local analysis. To achieve this goal, we employ the vertically integrated technique to able to treat the equation analytically. The tori are also modelled with Keplerian and non-Keplerian distributions of specific angular momentum, and we discuss the dependence of oscillation properties on the variable of the model related to angular momentum distribution and quadrupoles. In the present contribution, we further explore these properties with the possibility of relating oscillatory frequencies to some high-frequency quasi-periodic oscillations models and observed data.