Speaker
Description
In general relativity the gravitational field of a charged, spherically symmetric, non-rotating body is described by the Reissner-Nordström metric. This metric reveals the existence of a naked singularity when the charge (Q) exceeds the mass (M). For all Reissner-Nordström naked singularities, there exists a zero gravity sphere where a test particle can remain at rest. Outside that sphere gravity is attractive, inside it gravity is repulsive. For large values of Q/M circular test-particle orbits are stable down to the zero-gravity sphere and their angular frequency has a maximum outside the zero-gravity radius. We construct polytropic tori with uniform values of specific angular momentum in the naked singularity regime of the Reissner-Nordström metric (Q/M>1).