Influence of nonlinear electrodynamics on time-dependent accretion dynamics around Kalb-Ramond black hole
CHINESE PHYSICS C, cilt.50, sa.8, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 50 Sayı: 8
- Basım Tarihi: 2026
- Doi Numarası: 10.1088/1674-1137/ae66d0
- Dergi Adı: CHINESE PHYSICS C
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, INSPEC
- İstanbul Üniversitesi Adresli: Evet
Özet
In this paper, we analyze the dynamics of test particles in a Kalb-Ramond black hole (BH) spacetime coupled to nonlinear electrodynamics. After explicitly constructing the corresponding BH metric, including the nonlinear electromagnetic contributions to the geometry, we study the geodesic equations, focusing on the effective potential, the innermost stable circular orbits (ISCOs), and test-particle trajectories. This provides a quantitative description of orbital motion under the combined gravitational, Kalb-Ramond, and nonlinear electromagnetic effects. We then examine small perturbations of circular geodesics and derive the associated epicyclic frequencies for local and distant observers. These results show how the Kalb-Ramond field and nonlinear electrodynamics influence orbital stability, quasi-periodic oscillations (QPOs), and possible high-energy astrophysical signatures. Next, we numerically model Bondi-Hoyle-Lyttleton (BHL) accretion onto Kalb-Ramond BHs to assess how spacetime parameters affect flow morphology and dynamics. As the deformation parameters increase, the shock cone becomes more collimated, the stagnation point moves closer to the event horizon, and the matter density inside the cone decreases. For small deformations, QPO frequencies exhibit systematic shifts with enhanced oscillation amplitudes, whereas strong deformations damp the oscillations and produce a smooth, quasi-steady accretion rate. In this way, we illustrate a direct connection between spacetime geometry, shock-cone structure, and accretion variability, demonstrating that accretion dynamics serve as a sensitive probe of Kalb-Ramond BH spacetimes.