Features of motion around charged D-stars

摘要

The motion of light and a neutral test particle around the charged D-star has been studied. The difference of the deficit angle of light from the case in asymptotically flat space-time is in a factor (1 - ε2). The motion of a test particle is affected by the deficit angle and the charge. Through the phase analysis, we prove the existence of the periodic solution to the equation of motion and the effect of the deficit angle and the charge on the critical point and its type. We also give the conditions under which the critical point is a stable center and an unstable saddle point.