Efficiency of the centrifugally induced curvature drift instability in AGN winds

Osmanov, Z.

doi:10.1051/0004-6361:200809710

Cited by 12 publications

(16 citation statements)

References 15 publications

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“…However, rotation and relativity are hard to match with each other [4] because of some puzzling features. In astrophysics, there exists the so-called light cylinder problem, the lack of understanding about what happens in the region where the magnetic field lines of a rigidly rotating pulsar reach the speed of light [4][5][6]; some authors argue that the magnetic field lines rotate with a speed greater than that of the light beyond this cylinder [7]. The electromagnetic fields have also opened fundamental questions in terms of rotational motion [8,9], and this theory provides a strong support to model several astrophysical objects, such as pulsars [10,11] and active galactic nuclei [12].…”

Section: Introductionmentioning

confidence: 99%

Relativistic Rotating Electromagnetic Fields

Vargas-Rodríguez

Gallegos

Muñiz-Torres

et al. 2020

Advances in High Energy Physics

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In this work, we consider axially symmetric stationary electromagnetic fields in the framework of special relativity. These fields have an angular momentum density in the reference frame at rest with respect to the axis of symmetry; their Poynting vector form closed integral lines around the symmetry axis. In order to describe the state of motion of the electromagnetic field, two sets of observers are introduced: the inertial set, whose members are at rest with the symmetry axis; and the noninertial set, whose members are rotating around the symmetry axis. The rotating observers measure no Poynting vector, and they are considered as comoving with the electromagnetic field. Using explicit calculations in the covariant 3 + 1 splitting formalism, the velocity field of the rotating observers is determined and interpreted as that of the electromagnetic field. The considerations of the rotating observers split in two cases, for pure fields and impure fields, respectively. Moreover, in each case, each family of rotating observers splits in two subcases, due to regions where the electromagnetic field rotates with the speed of light. These regions are generalizations of the light cylinders found around magnetized neutron stars. In both cases, we give the explicit expressions for the corresponding velocity fields. Several examples of relevance in astrophysics and cosmology are presented, such as the rotating point magnetic dipoles and a superposition of a Coulomb electric field with the field of a point magnetic dipole.

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Section: Introductionmentioning

confidence: 99%

Relativistic Rotating Electromagnetic Fields

Vargas-Rodríguez

Gallegos

Muñiz-Torres

et al. 2020

Advances in High Energy Physics

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“…The corresponding mechanism of reconstruction of magnetospheres in the LC area has been studied for pulsars and supermassive black holes (Ref. 13) and it has been shown that under certain circumstances the field lines obtain the configuration of the Archimede's spiral.…”

Section: Introductionmentioning

confidence: 99%

Particles on the rotating channels in the wormhole metrics

Arsenadze

Osmanov

2017

Int. J. Mod. Phys. D

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In the Ellis-Bronnikov wormhole (WH) metrics the motion of a particle along curved rotating channels is studied. By taking into account a prescribed shape of a trajectory we derive the reduced $1+1$ metrics, obtain the corresponding Langrangian of a free particle and analytically and numerically solve the corresponding equations of motion. We have shown that if the channels are twisted and lag behind rotation, under certain conditions beads might asymptotically reach infinity, leaving the WH, which is not possible for straight co-rotating trajectories. The analytical and numerical study is performed for two and three dimensional cases and initial conditions of particles are analysed in the context of possibility of passing through the WH.Comment: 12 pages, 7 figure

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“…The similar problem, thus excitation of the CDI in AGN magnetospheres was studied in Ref. 12 and it has been shown that the instability is very efficient and might strongly influence processes in AGN plasmas. The major restriction of this work was that we have studied particles with exactly equal initial phases, and it is clear that most of the electrons have different values of phases.…”

Section: Light Cylindermentioning

confidence: 94%

“…On the other hand, in Ref. 12 it has been shown that AGN magnetospheric parameters satisfy the condition ω 0 /Ω ≪ 1. This in turn means that all terms with Ω(2s + q) and Ω(2[s + µ] + q) (2s + q = 0, 2[s + µ] + q = 0) are rapidly oscillating and do not influence the final result.…”

Section: Excitation Of Curvature Drift Wavesmentioning

confidence: 99%

On the Role of the Curvature Drift Instability in the Dynamics of Electrons in Active Galactic Nuclei

Osmanov

2013

Int. J. Mod. Phys. D

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We study the influence of the centrifugally driven curvature drift instability (CDI) on the dynamics of relativistic electrons in the magnetospheres of active galactic nuclei (AGN). We generalize our previous work by considering relativistic particles with different initial phases. Considering the Euler, continuity, and induction equations, by taking into account the resonant conditions, we derive the growth rate of the CDI. We show that due to the centrifugal effects, the rotational energy is efficiently pumped directly into the drift modes, that leads to the generation of a toroidal component of the magnetic field. As a result, the magnetic field lines transform into such a configuration when particles do not experience any forces and since the instability is centrifugally driven, at this stage the CDI is suspended.

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Efficiency of the centrifugally induced curvature drift instability in AGN winds

Cited by 12 publications

References 15 publications

Relativistic Rotating Electromagnetic Fields

Relativistic Rotating Electromagnetic Fields

Particles on the rotating channels in the wormhole metrics

On the Role of the Curvature Drift Instability in the Dynamics of Electrons in Active Galactic Nuclei

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