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Geometrically thick equilibrium tori around a dyonic black hole with quasi-topological electromagnetism
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We study geometrically thick and non-self gravitating equilibrium tori orbiting a static spherically symmetric dyonic black hole with quasi-topological electromagnetism. Our results show that the electric and magnetic charges together with the coupling parameter in the quasi-topological electromagnetism lead to a much richer class of equilibrium tori. There are a range of parameters which allow for the existence of double tori. The properties of double equilibrium tori become far richer. There exist transitions between single torus and double tori solutions as we change the specific angular momentum of the fluid. These properties of equilibrium tori could help to understand the dyonic black hole and its thick accretion disk.
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A new type of multi-branch periodic orbits in dyonic black holes
Dyonic black holes with non-monotonic metric functions support multiple geometrically distinct but topologically identical periodic orbits for the same rational label, plus bound orbits with energy above unity.
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