On the Inner Horizon Instability of Non-Singular Black Holes

Regular black holes represent a conservative model in which the classical singularity is replaced by a non-singular core without necessarily modifying the spacetime outside the trapping horizon. Given the possible lack of phenomenological signatures, it is crucial to study the consistency of the model. In this short work, we review the physical mechanism leading to the instability of the central core, arguing that that non-perturbative backreation is non-negligible and must be taken into account to provide a meaningful description of physical black holes.

Automated summary

This short work reviews the physical mechanism leading to the instability of the central core in regular black holes and argues for the importance of taking into account non-perturbative backreaction for a meaningful description of physical black holes.