Testing Horndeski gravity with S2 star orbit

Abstract

We have explored a completely new and alternative way to restrict the parameter space of Horndeski theory of gravity. Using its Newtonian limit, it is possible to test the theory at a regime where, given its complexity and the small magnitude of the expected effects, it is poorly probed. At Newtonian level, it gives rise to a generalized Yukawa-like Newtonian potential which we have tested using S2 star orbit data. Our model adds five parameters to the General Relativity model, and the analysis constrains two of them with unprecedented precision to these energy scales, while only gives an exclusion region for the remaining parameters. We have shown the potential of weak-field tests to constrain Horndeski gravity opening, as a matter of fact, a new avenue that deserves to be further, and deeply, explored near in the future.

8 pages, 4 figures, 3 tables, 1 supplementary figure. Accepted for publication on MNRAS

References in corpus (10)

• Event-horizon-scale structure in the supermassive black hole candidate at the Galactic Centre
• Horndeski theory and beyond: a review
• Detection of the Schwarzschild precession in the orbit of the star S2 near the Galactic centre massive black hole
• An Update on Monitoring Stellar Orbits in the Galactic Center
• Testing General Relativity with stellar orbits around the supermassive black hole in our Galactic center
• General relativistic effects on the orbit of the S2 star with GRAVITY
• Orbital precession of the S2 star in Scalar-Tensor-Vector-Gravity
• $f(R)$-gravity after the detection of the orbital precession of the S2 star around the Galactic centre massive black hole
• Dark-Matter-Induced Weak Equivalence Principle Violation
• Unveiling the nature of SgrA* with the geodesic motion of S-stars

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• Testing space-time geometries and theories of gravity at the Galactic Center with pulsar's time delay
• Constraints on metric-affine gravity black holes from the stellar motion at the Galactic Center
• Future prospects for measuring 1PPN parameters using observations of S2 and S62 at the Galactic Center
• Constraining a disformal Schwarzschild black hole in DHOST theories with the orbit of the S2 star
• PyGRO: a Python Integrator for General Relativistic Orbits
• Probing a Lorentz-violating parameter from orbital precession of the S2 star around the galactic centre supermassive black hole
• Testing black hole space-times with the S2 star orbit: a Bayesian comparison
• Gravitational signatures beyond Newton: exploring hierarchical three-body dynamics
• Detecting Lorentz-violation induced by a tensor field with S-star's motion around Sgr A*