H. Balasin et H. Nachbagauer, THE ENERGY-MOMENTUM TENSOR OF A BLACK-HOLE, OR WHAT CURVES THE SCHWARZSCHILD GEOMETRY, Classical and quantum gravity, 10(11), 1993, pp. 2271-2278
Using distributional techniques we calculate the energy-momentum tenso
r of the Schwarzschild geometry. It turns out to be a well defined ten
sor distribution concentrated on the r = 0 region which is usually exc
luded from spacetime. This provides a physical interpretation for the
curvature of this geometry.