Publication date: Oct 1998
It is shown that in the field of some Kerr-Newman naked singularities a
stationary spherical shell of charged dust can exist, with the specific
charge being the same for all particles of the dusty shell.
Gravitational attractions acting on the particles are balanced by
electromagnetic repulsions in such a way that the shell is stable
against radial perturbations. Particles of the shell move along orbits
with constant latitude and radius. Rotation of the shell is
differential. The shell is corotating relative to static observers at
infinity, but it is counterrotating relative to the family of locally
nonrotating observers. No such a shell can exist in the field of
Kerr-Newman black holes.
Stuchlik, Z.; Hledik, S.;