Publication date: Mar 2018
Abstract:
We study the motion of current carrying charged string loops in the
Reissner-Nordström black hole background combining the gravitational and
electromagnetic field. Introducing new electromagnetic interaction
between central charge and charged string loop makes the string loop
equations of motion to be non-integrable even in the flat spacetime
limit, but it can be governed by an effective potential even in the
black hole background. We classify different types of the string loop
trajectories using effective potential approach, and we compare the
innermost stable string loop positions with loci of the charged particle
innermost stable orbits. We examine string loop small oscillations
around minima of the string loop effective potential, and we plot radial
profiles of the string loop oscillation frequencies for both the radial
and vertical modes. We construct charged string loop quasi-periodic
oscillations model and we compare it with observed data from
microquasars GRO 1655-40, XTE 1550-564, and GRS 1915+105. We also study
the acceleration of current carrying string loops along the vertical
axis and the string loop ejection from RN black hole neighbourhood,
taking also into account the electromagnetic interaction.
Authors:
Oteev, Tursinbay; Kološ, Martin; Stuchlík, Zdeněk;