Probing bumblebee gravity with black hole X-ray data

Abstract Bumblebee gravity is one of the simplest theories with spontaneous Lorentz symmetry breaking. Since we know a rotating black hole solution in bumblebee gravity, can potentially test this model available astrophysical observations holes. In work, construct reflection and use our to analyze features NuSTAR spectrum Galactic EXO 1846-031 order constrain Lorentz-violating parameter $$\ell $$ ℓ . We find that analysis cannot because very strong degeneracy between estimates spin $$a_*$$ a ∗ Such may be broken by combining other observations.