Tidal Stretching and Compression in Black Bounce Backgrounds

TL;DR

This paper investigates tidal forces in black bounce spacetimes, revealing finite tidal effects and potential compression regions, thus enhancing understanding of these exotic objects' physical properties.

Contribution

It provides a detailed analysis of tidal forces in black bounce backgrounds, highlighting their finiteness and unique compression effects not seen in traditional black holes.

Findings

Tidal forces are finite throughout black bounce spacetimes.

Compression effects can occur in certain regions, unlike Schwarzschild black holes.

The study offers insights into the physical behavior of regular black holes with wormhole structures.

Abstract

Black bounces are compact objects that combine the structures of regular black holes with those of wormholes. These spacetimes exhibit a rich causal structure and can differ fundamentally from usual black holes. In this work, we study the behavior of the tidal forces by considering different black bounce models. To this end, we start with the geodesic deviation equation and the tidal tensor, from which we compute the radial and angular components of the tidal forces. We find that these components are finite throughout the entire spacetime, including at the wormhole throats. Through the components of the displacement vector, we observe that, unlike the Schwarzschild case, a compression effect on bodies may occur in certain regions.