Abstract
Circular timelike geodesics in the vicinity of a Reissner-Nordstrom black hole of massm and chargeq are considered. These geodesics exist for allr>(3m/2) [1+(1−8q2/9m2)1/2], and are stable for allr>rs, wherers is the largest real root ofr3−6mr2+9q2r−4q4/m=0. Forq2=0 these expressions reduce to the familiar Schwarzschild resultsr>3m andr>6m, respectively; forq2=m2 they reduce tor>2m andr>4m.
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