Phenomenological Rotating Extension of Black Holes with Primary Scalar Hair: Shadow Signatures in Beyond Horndeski Gravity

arXiv:2602.16237 · gr-qc, astro-ph.CO, hep-th · Submitted 2026-02-18 · Read on arXiv

gr-qc, astro-ph.CO, hep-th

Submitted: 2026-02-18

Updated: 2026-09-02

Comments: 27 pages, 13 figures, 2 tables

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Terminology

• Degeneracy — 9× in this paper · explained in 3 episodes
• Consistency — 7× in this paper · explained in 3 episodes
• Event Horizon Telescope — 7× in this paper
• Gravitational Lensing — 4× in this paper · explained in 2 episodes
• Higher-order derivatives — 1× in this paper · explained in 2 episodes
• In General Relativity — 1× in this paper
• Multi-messenger approach — 1× in this paper · explained in 3 episodes
• Very Long Baseline Interferometry — 1× in this paper

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• A formal introduction to Horndeski and Galileon theories and their generalizations
• Asymptotically locally AdS and flat black holes in the presence of an electric field in the Horndeski scenario
• Breaking of Vainshtein screening in scalar-tensor theories beyond Horndeski
• Constraints on deviations from ${\Lambda}$CDM within Horndeski gravity
• Black holes and stars in Horndeski theory
• Dark energy in Horndeski theories after GW170817: A review
• Evading the theoretical no-go theorem for nonsingular bounces in Horndeski/Galileon cosmology

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