MG14 - Talk detail

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Abstract

In order to test the role of large-scale magnetic fields on accretion processes, we study dynamics of charged test particles in vicinity of a black hole immersed into an external asymptotically uniform magnetic field. We examine different types of trajectories for charged particles and we determine the fundamental frequencies of small harmonic oscillations around stable circular orbits. We discuss consequences of ionization of test particles forming a neutral accretion disk and we explore the fate of charged test particles after ionization. After ionization the charged particles can oscillate around stable circular orbit or can escape to infinity along rotation axis. We discuss if such processes could be used as explanation of high-frequency quasiperiodic oscillations observed in microquasars or for generation of relativistic jets.

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Session

Accepted

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Time

Talk

Title

Abstract

Infinitesimally thin toroidal structures modelled by current-carrying string loops are studied. The axisymmetric string loops moving along the symmetry axis of a black hole could in a simplified way represent magnetized plasma that exhibits associated string-like behaviour. We study the motion in the field of braneworld compact object (black holes or naked singularities). The dynamics of the linear 1D test string loop in the Kerr spacetime and its stable equilibrium positions are examined. Conversion of the energy of the string oscillations to the energy of the linear translational motion is discussed as such a transmutation effect can potentially represent acceleration of jets in active galactic nuclei and microquasars. The model of string loop oscillations around a stable equilibrium position in the Kerr background is applied to explain the special set of frequencies related to the high-frequency quasiperiodic oscillations

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