  We study the dynamics of a cosmic string loop captured by a rotating black
hole, ignoring string reconnections. A loop is numerically evolved in Kerr
spacetime, with the result that it turns into one or more growing or
contracting double-lines rotating around the black hole in the equatorial
plane. This is in good agreement with the approximate analytical treatment of
the problem investigated by Xing et al., who studied the evolution of the
auxiliary curve associated with the string loop. We confirm that the auxiliary
curve deformation can indeed describe the string motion in realistic physical
scenarios to a reasonable accuracy, and can thus be used to further study other
phenomena such as superradiance and reconnections of the captured loop.
