Testing Horndeski Gravity from EHT Observational Results for Rotating Black Holes

Abstract

The Event Horizon Telescope (EHT) collaboration recently unveiled the first image of the supermassive black hole M87*, which exhibited a ring of angular diameter ${\theta }_d=42\pm 3\mu as$, a circularity deviation $\Delta C\le 0.1$, and also inferred a black hole mass of $M=(6.5\pm 0.7)\times 10^9{M}_{\odot }$. This provides a new window onto tests of theories of gravity in the strong-field regime, including probes of violations of the no-hair theorem. It is widely believed that the Kerr metric describes the astrophysical black holes, as encapsulated in the critical but untested no-hair theorem. Modeling Horndeski gravity black holes -- with additional hair parameter $h$ besides the mass $M$ and spin $a$ of the Kerr black hole -- as the supermassive black hole M87*, we observe that to be a viable astrophysical black hole candidate, the EHT result constrains ($a$, $h$) parameter space. However, a systematic bias analysis indicates rotating Horndeski black hole shadows may or may not capture Kerr black hole shadows, depending on the parameter values; the latter is the case over a substantial part of the constrained parameter space, allowing Horndeski gravity and general relativity to be distinguishable in the said space, and opening up the possibility of potential modifications to the Kerr metric.

14 pages, 10 figures, 1 table. Matched to the published version

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• No-Hair Theorem in the Wake of Event Horizon Telescope
• Testing Rotating Regular Metrics as Candidates for Astrophysical Black Holes
• Evaluation of New Submillimeter VLBI Sites for the Event Horizon Telescope
• Parameters estimation and strong gravitational lensing of nonsingular Kerr-Sen black holes
• Constraining some Horndeski gravity theories
• Investigating strong gravitational lensing effects by suppermassive black holes with Horndeski gravity
• Estimating the cosmological constant from shadows of Kerr--de Sitter black holes
• Superentropic AdS Black Hole Shadows
• Black hole parameter estimation with synthetic Very Long Baseline Interferometry data from the ground and from space
• Rigidly rotating ZAMO surfaces in the Kerr spacetime

Cited by in corpus (47)

• Horizon-scale tests of gravity theories and fundamental physics from the Event Horizon Telescope image of Sagittarius A${}^{\ast }$
• Tests of Loop Quantum Gravity from the Event Horizon Telescope Results of Sgr A${}^{\ast }$
• Constraining a modified gravity theory in strong gravitational lensing and black hole shadow observations
• Testing Rotating Regular Metrics with EHT Results of Sgr A*
• Shadows and photon rings of regular black holes and geonic horizonless compact objects
• Superradiant evolution of the shadow and photon ring of Sgr A${}^{\star }$
• Shadow and quasinormal modes of the Kerr-Newman-Kiselev-Letelier black hole
• An Upper Limit on the Charge of the Black Hole Sgr A* from EHT Observations
• Rings and images of Horndeski hairy black hole illuminated by various thin accretions
• Quasiperiodic oscillations around hairy black holes in Horndeski gravity
• Photon regions, shadow observables and constraints from M87* of a charged rotating black hole
• Testing strong gravitational lensing effects by supermassive compact objects with regular spacetimes
• Kerr black holes with synchronised Proca hair: lensing, shadows and EHT constraints
• Rotating Black Holes in Horndeski Gravity: Thermodynamic and Gravitational Lensing
• Absorption, Scattering, Geodesics, Shadows and Lensing Phenomena of Black Holes in Effective Quantum Gravity
• Investigating effects of dark matter on photon orbits and black hole shadows
• Observational predictions of LQG motivated polymerized black holes and constraints from Sgr A* and M87*
• Asymptotically locally flat and AdS higher-dimensional black holes of Einstein-Horndeski-Maxwell gravity in the light of EHT observations: shadow behavior and deflection angle
• Testing EGB gravity coupled to bumblebee field and black hole parameter estimation with EHT observations
• EHT observables as a tool to estimate parameters of supermassive black holes
• The shadows of accelerating Kerr-Newman black hole and constraints from M87*
• Scalar field perturbation around a rotating hairy black hole: quasinormal modes, quasibound states and superradiant instability
• Loop Quantum Gravity motivated multihorizon rotating black holes
• Superradiant energy extraction from rotating hairy Horndeski black holes
• Properties of an axisymmetric Lorentzian non-commutative black hole
• Constraining a one-dimensional wave-type gravitational wave parameter through the shadow of M87* via Event Horizon Telescope
• Parameter estimation of Kerr-Bertotti-Robinson black holes using their shadows
• Gravitational signatures of a nonlinear electrodynamics in $f(R,T)$ gravity
• Shadows and parameter estimation of rotating quantum corrected black holes and constraints from EHT observation of M87* and Sgr A*
• Shadows aspect of rotating black holes in the Einstein-AdS SU(N)-nonlinear sigma model
• Gravitational lensing by a stable rotating regular black hole
• Perturbations of massless external fields in Horndeski hairy black hole
• Influence of Quantum Correction on Kerr Black Hole in Effective Loop Quantum Gravity via Shadows and EHT Results
• Total light bending in non-asymptotically flat black hole spacetimes
• Strong Gravitational Lensing in Horndeski theory
• Gravitational odd-parity perturbation of a Horndeski hairy black hole: quasinormal mode and parameter constraint
• Image of Quantum Improved Regular Kerr Black Hole and Parameter Constraints from EHT Observations
• Five dimensional rotating and Quintessence black hole and their hypershadows
• Axisymmetric black hole in a non-commutative gauge theory: classical and quantum gravity effects
• QNM families: classification and competition
• Probing Observable Features of Lorentz violation in Low-Energy Hořava Gravity with Accretion Disk Images of Black Hole
• Accretion of matter of a new bumblebee black hole
• Limiting the Yukawa Gravity through the Black Hole Shadows of Sgr A* and M87*
• Shadow of rotating black holes with consistent thermodynamics
• Image of a quantum-corrected black hole without Cauchy horizons illuminated by a static thin accretion disk
• Gravitational aspects of a new bumblebee black hole
• Constraints on the $\gamma$-parameter for the vacuum solution of Cotton gravity with geodesics and shadows