Publication date: Mar 2012
Abstract:
We study non-geodesic corrections to the quasicircular motion of charged
test particles in the field of magnetized slowly rotating neutron stars.
The gravitational field is approximated by the Lense-Thirring geometry,
and the magnetic field is of the standard dipole character. Using a
fully relativistic approach, we determine the influence of the
electromagnetic interaction (both attractive and repulsive) on the
quasicircular motion. We focus on the behaviour of the orbital and
epicyclic frequencies of the motion. Components of the four-velocity of
the orbiting charged test particles are obtained by the numerical
solution of equations of motion, and the epicyclic frequencies are
obtained by using the standard perturbative method. The role of the
combined effect of the neutron star magnetic field and its rotation in
the character of the orbital and epicyclic frequencies is discussed. It
is demonstrated that even in the Lense-Thirring spacetime, particles
being static relative to distant observers can exist due to the combined
gravo-electromagnetic interaction.
Authors:
Bakala, Pavel; Urbanec, Martin; Šrámková, Eva; Stuchlík, Zdeněk; Török, Gabriel;