Spin effects on motion of charged particles around magnetized black holes in conformally coupled scalar fields
Аннотация
We investigate the dynamics of charged spinning test particles in the spacetime of a magnetized Bocharova-Bronnikov-Melnikov-Bekenstein black hole (BH), an extremal solution of the Einstein-Maxwell-conformally coupled scalar field equations. Using the Mathisson-Papapetrou-Dixon equations, we derive the equations of motion that incorporate spin-curvature coupling and electromagnetic interactions due to the particle’s charge and an external magnetic field. The effective potential formalism is employed to analyze stable circular orbits, the innermost stable circular orbit (ISCO), and the superluminal bound, ensuring timelike motion. The influence of the particle’s spin s , a magnetic coupling parameter ω B , is examined numerically, revealing significant shifts in the ISCO radius, specific angular momentum, and energy due to spin and electromagnetic effects. We further study particle collisions near the event horizon, computing the critical angular momentum and center-of-mass energy, which exhibit enhancements akin to the Bañados-Silk-West effect, driven by gravitational, electromagnetic, and spin interactions. Our results highlight the intricate interplay of these effects in the BBMB spacetime, offering insights into high-energy astrophysical processes such as accretion disk dynamics and particle acceleration near magnetized BHs.