Spin effects on charged particle motion in magnetized Reissner-Nordström spacetime

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F47813059%3A19630%2F25%3AA0000469" target="_blank" >RIV/47813059:19630/25:A0000469 - isvavai.cz</a>

Result on the web

<a href="https://link.springer.com/article/10.1140/epjc/s10052-025-14974-5?utm_source=getftr&utm_medium=getftr&utm_campaign=getftr_pilot&getft_integrator=clarivate" target="_blank" >https://link.springer.com/article/10.1140/epjc/s10052-025-14974-5?utm_source=getftr&utm_medium=getftr&utm_campaign=getftr_pilot&getft_integrator=clarivate</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1140/epjc/s10052-025-14974-5" target="_blank" >10.1140/epjc/s10052-025-14974-5</a>

Result language

angličtina

Original language name

Spin effects on charged particle motion in magnetized Reissner-Nordström spacetime

Original language description

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 ω 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 ω=qB0 are evaluated at fixed small B0 by varying the particle charge q; for ISCO collisions, the first and the second particle orbit and collide at the same ISCO radius.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

European Physical Journal C

ISSN

1434-6044

e-ISSN

—

Volume of the periodical

85

Issue of the periodical within the volume

10

Country of publishing house

US - UNITED STATES

Number of pages

15

Pages from-to

„1204-1“-„1204-15“

UT code for WoS article

001599760100004

EID of the result in the Scopus database

2-s2.0-105020019029