Four-dimensional regular black strings in bilocal gravity

TL;DR

This paper presents a new four-dimensional regular black string solution in bilocal gravity, featuring horizons, a mass remnant, and stability conditions, extending understanding of black string configurations in modified gravity theories.

Contribution

It introduces a novel static black string solution in bilocal gravity that is regular at the origin and explores its properties, including horizons and stability, with a stationary counterpart.

Findings

Solution is regular at the origin and asymptotically approaches the standard black string.

Presence of event and internal horizons depending on mass density.

Existence of a mass remnant with zero Hawking temperature.

Abstract

In this paper, we obtain a static black string solution for a bilocal gravitational source in 3+1 dimensions. The solution is regular at the origin and tends asymptotically to the ordinary static uncharged black string solution of general relativity. It allows an event horizon and an internal horizon depending on the value of the mass density. A mass remnant associated with a vanishing Hawking temperature is also found. In order to stabilize the solution, a perfect cosmological fluid with state parameter $\omega>-1$ should be present throughout space. However, energy conditions do not exclude an exotic substance nearby the black string. Finally, we find the stationary counterpart of the solution and analyze the behavior of the horizons according to the mass and angular momentum of the spinning object.