Probing the Schwarzschild black hole in modified gravity by precessing motion of S2 star and OJ 287
Year: 2026
Type: article
Abstract: We investigate the precessing motion around the Schwarzschild black hole in modified gravity (MOG), an alternative gravitational theory that introduces a dimensionless coupling parameter $$\alpha $$ α to modify general relativity and describe gravitational correction effects. We obtain the first-order post-Newtonian quasi-Keplerian motion of a test particle in this spacetime and find its relativistic periastron advance. Then, we test this model with the precessing motion of the star S2 and of OJ 287 and determine the upper limits of the dimensionless coupling parameter as $$\alpha \sim 10^{-1}$$ α ∼ 10 - 1 . Compared with the best-fitting result given by the galaxy rotation curves as $$\alpha =8.89\pm 0.34$$ α = 8.89 ± 0.34 , our bound on $$\alpha $$ α is reduced by one order of magnitude.
Source: The European Physical Journal C
Authors: Bo Yang, Chunhua Jiang, Wenbin Lin
Institution: University of South China
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
Awards: G2874788548, G7319263615, G85228294
OpenAlex ID: W7166445787