Exploring the construction of field equations for regular black holes with dynamical regularization scales
Abstract
The study of the dynamics of regular black holes is an emergent area of research. Recent works have discussed how to deform the Einstein field equations to regularize spherically symmetric black hole solutions due to the introduction of a new physics scale acting as regulator. In this exploratory paper, we consider for the first time the problem of constructing field equations in which the regularization scale is a dynamical field. Such field equations may provide an effective description of the evolution of the cores of regular black holes due to the backreaction of matter, and a novel avenue for constructing alternative dynamical solutions of theoretical and phenomenological interest. We discuss a general family of field equations describing spherically symmetric gravity coupled to a scalar field, and study whether the sector with a constant scalar field contains solutions describing static regular black holes with no additional physics scales aside from the ones provided by the scalar field. We show that this question can be reduced to solving a linear partial differential equation for the coupling functions between the scalar and the metric degrees of freedom.
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BibTeX
@misc{carballorubio2026exploring,
title = {{Exploring the construction of field equations for regular black holes with dynamical regularization scales}},
author = {Raúl Carballo-Rubio and Jacopo Mazza},
howpublished = {HAL},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.01733},
eprint = {2609.01733},
archivePrefix = {arXiv},
url = {https://hal.science/hal-05759097v1},
}
RIS
TY - UNPB
TI - Exploring the construction of field equations for regular black holes with dynamical regularization scales
AU - Raúl Carballo-Rubio
AU - Jacopo Mazza
PY - 2026
DA - 2026/09/01
PB - HAL
DO - 10.48550/arxiv.2609.01733
UR - https://hal.science/hal-05759097v1
AB - The study of the dynamics of regular black holes is an emergent area of research. Recent works have discussed how to deform the Einstein field equations to regularize spherically symmetric black hole solutions due to the introduction of a new physics scale acting as regulator. In this exploratory paper, we consider for the first time the problem of constructing field equations in which the regularization scale is a dynamical field. Such field equations may provide an effective description of the evolution of the cores of regular black holes due to the backreaction of matter, and a novel avenue for constructing alternative dynamical solutions of theoretical and phenomenological interest. We discuss a general family of field equations describing spherically symmetric gravity coupled to a scalar field, and study whether the sector with a constant scalar field contains solutions describing static regular black holes with no additional physics scales aside from the ones provided by the scalar field. We show that this question can be reduced to solving a linear partial differential equation for the coupling functions between the scalar and the metric degrees of freedom.
ER -