Black Bounces with multiple throats and anti-throats

Understand

In this article, we test the possibility of building new black-bounce spacetimes with changes in the area in the context of general relativity in four dimensions.

• These new metrics can present extra structures, such as anti-throats.
• We see two regions where the area goes to infinity, and, depending on the model, one of these regions presents curvature singularities.
• Regular metrics can be extended to negative values of the radial coordinate and have a symmetrical structure, whereas some singular cases cannot be extended and have no symmetrical structure.