(1) Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, RA-1428 Buenos Aires, Argentina;(2) Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina
Abstract:
We study the way in which the geometry of the trapping potential affects the vortex velocity in a Bose-Einstein condensate
confined by a toroidal trap. We calculate the vortex precession velocity through a simple relationship between such a velocity
and the gradient of the numerically obtained vortex energy. We observe that our results correspond very closely to the velocity
calculated through time evolution simulations. However, we find that the estimates derived from available velocity field formulas
present appreciable differences. To resolve such discrepancies, we further study the induced velocity field, analyzing the
effect of global features of the condensate on such a field and on the precession velocity.