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On the stability of Einsteinian Cubic Gravity black holes in EFT

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arxiv 2306.02924 v1 pith:FOEUZ66L submitted 2023-06-05 hep-th gr-qc

Pablo Bueno , Pablo A. Cano , Robie A. Hennigar This is my paper · ORCID
classification hep-thgr-qc
keywords blackcubicholestheoryanalysiseinsteiniangravityabove
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In this note we revisit the analysis performed in arXiv:2305.07217 of odd-parity perturbations around static and spherically symmetric black holes in Einsteinian Cubic Gravity (ECG). We show that the additional propagating modes always have masses much above the cutoff of the theory. Therefore, contrary to what is claimed in that paper, the ECG black holes remain stable within the effective field theory regime. We consider the same analysis for a general cubic theory, showing that the ECG results are not special in this regard. We use the occasion to make some clarifications on the role, uses and limitations of ECG and its generalizations.

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  1. Signatures of cubic gravity in the strong regime

    gr-qc 2025-02 conditional novelty 5.0 of 10

    Einsteinian cubic gravity shrinks (grows) black hole horizons for positive (negative) coupling and shifts the photon sphere enough that SgrA* shadow observations can bound the coupling to approximately 0.1.

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