Algorithms & radiation dynamics near black holes

We study hot accretion disks orbiting black holes. Their temperatures are a few keVs and they emit strongly in the X-rays. The material reabsorbs this light and develops unilateral braking due to the Poynting-Robertson effect, a process that modifies the material dynamics and kinematics. Using the sets of codes we developed, we calculate the generated radiation field for various accretion disk models or black hole spins, and consider the consequences. The results divulge clear indications that the primary factor affecting the radiation field is the density gradient rather than the disk volume. We also record evidence of early jet collimating tendencies due to the radiation. The light absorbed by the material additionally leads to the generation of magnetic fields in the systems via the Cosmic Battery mechanism. These fields evolve, possibly diffusing and also leading to the formation of jets. Finally, we attempt estimations of the black hole spin using the detectable Einstein-Khvolson rings.