Geodesics and Geodesic Deviation in static Charged Black Holes

Understand

The radial motion along null geodesics in static charged black hole space-times, in particular, the Reissner-Nordstr\"om and stringy charged black holes are studied.

• We analyzed the properties of the effective potential.
• The circular photon orbits in these space-times are investigated.
• We found that the radius of circular photon orbits in both charged black holes are different and differ from that given in Schwarzschild space-time.