Publication date: Oct 2014
Abstract:
We study the acceleration of an electric current-carrying and axially
symmetric string loop initially oscillating in the vicinity of a
Schwarzschild black hole embedded in an external asymptotically uniform
magnetic field. The plane of the string loop is orthogonal to the
magnetic field lines and the acceleration of the string loop occurs due
to the transmutation effect turning in the deep gravitational field the
internal energy of the oscillating strings to the energy of their
translational motion along the axis given by the symmetry of the black
hole spacetime and the magnetic field. We restrict our attention to the
motion of string loop with energy high enough, when it can overcome the
gravitational attraction and escape to infinity. We demonstrate that for
the current-carrying string loop the transmutation effect is enhanced by
the contribution of the interaction between the electric current of the
string loop and the external magnetic field and we give conditions that
have to be fulfilled for an efficient acceleration. The Schwarzschild
black hole combined with the strong external magnetic field can
accelerate the current-carrying string loop up to the velocities close
to the speed of light v˜c. Therefore, the string loop
transmutation effect can potentially well serve as an explanation for
acceleration of highly relativistic jets observed in microquasars and
active galactic nuclei.
Authors:
Tursunov, Arman; Kološ, Martin; Stuchlík, Zdeněk; Ahmedov, Bobomurat;