General classification of charged test particle circular orbits in Reissner--Nordstr\"om spacetime

Understand

We investigate charged particles circular motion in the gravitational field of a charged mass distribution described by the Reissner-Nordstr\"om spacetime.

• We introduce a set of independent parameters completely characterizing the different spatial regions in which circular motion is allowed.
• We provide most complete classification of circular orbits for different sets of particle and source charge-to-mass ratios.
• We study both black holes and naked singularities and show that the behavior of charged particles depend drastically on the type of source.