  We study the dynamics of a single and a pair of vortices in quasi
two-dimensional Bose-Einstein condensates at finite temperatures. We use the
stochastic Gross-Pitaevskii equation, which is the Langevin equation for the
Bose-Einstein condensate, to this end. For a pair of vortices, we study the
dynamics of both the vortex-vortex and vortex-antivortex pairs, which are
generated by rotating the trap and moving the Gaussian obstacle potential,
respectively. Due to thermal fluctuations, the constituent vortices are not
symmetrically generated with respect to each other at finite temperatures. This
initial asymmetry coupled with the presence of random thermal fluctuations in
the system can lead to different decay rates for the component vortices of the
pair, especially in the case of two corotating vortices.
