Relativistic equilibrium fluid configurations around rotating deformed compact objects

TL;DR

This paper explores the equilibrium configurations of thick disks around rotating, deformed compact objects using an exact Einstein's field solution, revealing how quadrupole and rotation influence disk structures.

Contribution

It introduces a model for thick disks around rotating deformed objects based on a stationary generalization of the q-metric, analyzing their properties for arbitrary quadrupole and rotation parameters.

Findings

Various disk structures depend on quadrupole and rotation parameters.

Disks can be distinguished from static and Schwarzschild cases.

Model can help infer rotation and quadrupole parameters of the central object.

Abstract

We investigate the physical properties of equilibrium sequences of non-self-gravitating surfaces that characterize thick disks around a rotating deformed compact object described by a stationary generalization of the static q-metric. The spacetime corresponds to an exact solution of Einstein's field equations so that we can perform the analysis for arbitrary values of the quadrupole moment and rotation parameter. To study the properties of this disk's model, we analyze bounded trajectories in this spacetime. Further, we find that depending on the values of the parameters, we can have various disc structures that can easily be distinguished from the static case and also from the Schwarzschild background. We argue that this study may be used to evaluate the rotation and quadrupole parameters of the central compact object.