THE KERR–SCHILD ANSATZ REVISED
THE KERR–SCHILD ANSATZ REVISED
Kerr–Schild metrics have been introduced as a linear superposition of the flat spacetime metric and a squared null-vector field, say k, multiplied by some scalar function, say H. The basic assumption which led to Kerr solution was that k be both geodesic and shearfree. This condition is relaxed here and …