Accretion disk images around dilatonic black holes in dilaton-massive gravity

Abstract We consider the recently developed black hole in massive Einstein-dilaton gravity including the coupling of the dilaton scalar field to massive graviton terms. This model has different horizon structures such as event horizons and inner horizons depending on the values of certain parameters. These variations influence how the black hole interacts with its surroundings. We utilize the well-known Novikov–Thorne model to investigate the thin accretion disks into this interesting model. Our research shows a crucial correlation between the dynamics of the accretion disk and the parameters of dilatonic black holes in dilaton-massive gravity. We observe that dilaton-massive gravity leads to significant contraction and outward expansion. We offer a detailed analysis of accretion by examining both direct and secondary images at various radial distances and observation angles.