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Chaotic motion of particles in the spacetime of a Kerr black hole immersed in swirling universes
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We investigate the motion of particles in the spacetime of a Kerr black hole immersed in swirling universes. Using the Poincar\'{e} section, fast Lyapunov exponent indicator, bifurcation diagram and basins of attraction, we present the effects of the swirling parameter and the spin parameter on the dynamical behaviors of the motion of particles, and confirm the presence of chaos in the motion of particles in this background spacetime. We find that the swirling parameter can change the range of the spin parameter where the chaos occurs, and vice versa. Moreover, we observe clearly that, regardless of the spin parameter, there exist some self-similar fractal fine structures in the basins boundaries of attractors for the spacetime of a black hole immersed in swirling universes. The combination the swirling parameter and the spin parameter provides richer physics in the motion of particles.
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Thin accretion disk around a Kerr black hole immersed in swirling universes
Swirling-Kerr disks heat up in the inner region, dim in the outer region, shift their spectrum, and convert mass to radiation less efficiently as the swirl parameter grows.
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