Perfect fluid tori orbiting Kehagias-Sfetsos naked singularities

TL;DR

This paper investigates perfect fluid tori around Kehagias-Sfetsos naked singularities in Hořava gravity, revealing how quantum corrections influence the structure and stability of orbiting matter.

Contribution

It constructs and analyzes perfect fluid tori in K-S naked singularity spacetimes, highlighting the impact of the Hořava parameter on geodesic behavior and torus properties.

Findings

Tori are located above an 'antigravity' sphere with stable equilibrium.

The behavior of circular geodesics varies with the parameter  M^2, affecting torus structure.

The study links quantum gravity effects to astrophysical accretion phenomena.

Abstract

We construct perfect fluid tori in the field of the Kehagias-Sfetsos (K-S) naked singularity representing spherically symmetric vacuum solution of the modified Ho\v{r}ava quantum gravity that is characterized by a dimensionless parameter $\omega M^2$, combining the gravitational mass parameter $M$ of the spacetime with the Ho\v{r}ava parameter $\omega$ reflecting the role of the quantum corrections. In dependence on the value of $\omega M^2$, the K-S naked singularities demonstrate a variety of qualitatively different behavior of their circular geodesics that is fully reflected in the properties of the toroidal structures. In all of the K-S naked singularity spacetimes the tori are located above an "antigravity" sphere where matter can stay in stable equilibrium position, that is relevant for the stability of the orbiting fluid toroidal accretion structures.