https://doi.org/10.1140/epjc/s10052-025-14974-5
Regular Article - Theoretical Physics
Spin effects on charged particle motion in magnetized Reissner–Nordström spacetime
1
Nukus State Pedagogical Institute, Seyitov St. 104, 230100, Nukus, Uzbekistan
2
Karakalpak State University, Sh.Abdirov 1, 230112, Nukus, Uzbekistan
3
Research Centre for Theoretical Physics and Astrophysics, Institute of Physics, Silesian University in Opava, Bezručovo nám. 13, 74601, Opava, Czech Republic
4
Institute of Fundamental and Applied Research, National Research University TIIAME, Kori Niyoziy 39, 100000, Tashkent, Uzbekistan
5
University of Tashkent for Applied Sciences, Str. Gavhar 1, 100149, Tashkent, Uzbekistan
6
National University of Uzbekistan, 100174, Tashkent, Uzbekistan
7
Tashkent State Technical University, 100095, Tashkent, Uzbekistan
8
, Shota Rustaveli street 156, 100121, Tashkent, Uzbekistan
9
Mamun University, Bolkhovuz Street 2, 220900, Khiva, Uzbekistan
10
Urgench State University, Kh. Alimjan Str. 14, 221100, Urgench, Uzbekistan
Received:
16
August
2025
Accepted:
21
October
2025
Published online:
25
October
2025
This study investigates the dynamics of spinning charged test particles in the spacetime of a Reissner–Nordström (RN) black hole immersed in an asymptotically uniform magnetic field, using the Mathisson–Papapetrou–Dixon (MPD) equations supplemented with the Tulczyjew spin condition. We derive the equations of motion incorporating spin-curvature coupling, electromagnetic interactions, and magnetic field effects, leading to an effective potential that governs equatorial circular orbits. The analysis focuses on how particle spin s, charge q, black hole charge Q, and magnetic coupling 
modify the effective potential, innermost stable circular orbits (ISCO), critical angular momentum for capture, and center-of-mass energy in particle collisions. The obtained results show that a positive spin flattens the potential and shifts the minima inward, enabling closer orbits, while a negative spin steepens it for repulsion. ISCO radii decrease with aligned spin and magnetic coupling, reducing specific energy and angular momentum. Critical angular momentum increases with magnetic strength and charge, exhibiting non-monotonic spin dependence due to competing Lorentz and spin-curvature forces. For collisions, the center-of-mass energy spikes near the horizon, enhanced by opposite spins and counter-rotating orbits, but suppressed by strong magnetic repulsion. At ISCO, energies peak for weak or negative coupling. These findings reveal that spin-magnetic interactions expand stable orbital regimes and boost collision energies, with implications for high-energy astrophysics near magnetized charged black holes, such as particle acceleration in accretion disks or cosmic ray production. We treat the external magnetic field as a test field on a fixed RN geometry and assume it is sufficiently weak at the ISCO so that backreaction is negligible. Scans labeled by 
are evaluated at fixed small 
by varying the particle charge q; for ISCO collisions, the first and the second particle orbit and collide at the same ISCO radius.
© The Author(s) 2025
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Funded by SCOAP3.
