Nonreciprocal black holes with primary hair in beyond Horndeski gravity: Exact solutions and stability
Abstract
We develop a novel systematic method for constructing exact, static, and asymptotically flat black-hole solutions in shift-symmetric and Z2-symmetric beyond Horndeski theories. In contrast to previous studies, our approach does not rely on the restrictive reciprocal condition gttgrr=−1, allowing for more general geometries characterized by two independent metric functions. The resulting solution space contains two qualitatively distinct types of hair originating from different branches of the theory. One branch is characterized by khronometric hair, while the other by genuine scalar hair. In both, the scalar profile defines a nontrivial preferred foliation, but the shift-symmetry Noether current and the associated propagating degree of freedom are trivial for the former and nonvanishing for the latter. Focusing mainly on the second branch, we derive several distinct families of exact black-hole solutions. In general, these solutions are singular and exhibit primary scalar hair associated with an independent scalar charge. Nevertheless, we demonstrate that they can be regularized to yield regular black-hole or solitonic configurations, for which the scalar hair becomes secondary. We further investigate the stability properties of these solutions under linear perturbations by analyzing the axial sector and the monopole (ℓ=0) mode of the even-parity sector. For representative solutions with scalar hair, the perturbative analysis provides evidence for linear stability under the modes considered.
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BibTeX
@misc{bahamonde2026nonreciprocal,
title = {{Nonreciprocal black holes with primary hair in beyond Horndeski gravity: Exact solutions and stability}},
author = {Sebastian Bahamonde and Theodoros Nakas and Simon Iteanu},
howpublished = {HAL},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.11712},
eprint = {2610.11712},
archivePrefix = {arXiv},
url = {https://hal.science/hal-05829955v1},
}
RIS
TY - UNPB
TI - Nonreciprocal black holes with primary hair in beyond Horndeski gravity: Exact solutions and stability
AU - Sebastian Bahamonde
AU - Theodoros Nakas
AU - Simon Iteanu
PY - 2026
DA - 2026/10/08
PB - HAL
DO - 10.48550/arxiv.2610.11712
UR - https://hal.science/hal-05829955v1
AB - We develop a novel systematic method for constructing exact, static, and asymptotically flat black-hole solutions in shift-symmetric and Z_2-symmetric beyond Horndeski theories. In contrast to previous studies, our approach does not rely on the restrictive reciprocal condition g_ttg_rr=−1, allowing for more general geometries characterized by two independent metric functions. The resulting solution space contains two qualitatively distinct types of hair originating from different branches of the theory. One branch is characterized by khronometric hair, while the other by genuine scalar hair. In both, the scalar profile defines a nontrivial preferred foliation, but the shift-symmetry Noether current and the associated propagating degree of freedom are trivial for the former and nonvanishing for the latter. Focusing mainly on the second branch, we derive several distinct families of exact black-hole solutions. In general, these solutions are singular and exhibit primary scalar hair associated with an independent scalar charge. Nevertheless, we demonstrate that they can be regularized to yield regular black-hole or solitonic configurations, for which the scalar hair becomes secondary. We further investigate the stability properties of these solutions under linear perturbations by analyzing the axial sector and the monopole (ℓ=0) mode of the even-parity sector. For representative solutions with scalar hair, the perturbative analysis provides evidence for linear stability under the modes considered.
ER -