Nashed, "Kerr-Newman solution
and energy in teleparallel equivalent of Einstein theory," Modern Physics Letters A, vol.
Existing models involving screening or covering of causally dangerous regions require introduction of cohesive forces of nonelectromagnetic origin and are typically constructed by matching the exterior Kerr-Newman solution
with some hypothetic internal sources ([47, 48] and references therein).
In this regards the Kerr-Newman solution
can be represented in the Kerr-Schild form :
The Kerr-Newman solution to the Einstein-Maxwell equations 
The Kerr-Newman solution belongs to the Kerr family solutions of the source-free Maxwell-Einstein equations with the only contribution to a stress-energy tensor coming from a source-free electromagnetic field .
The Kerr-Newman solution
is, in relativistic units,