Kretschner Scalar¶

Kretschner scalar — a coordinate-invariant curvature invariant.

gravica.kretschner.kretschner_scalar(riemann)¶

Kretschner scalar \(K = R_{abcd}\,R^{abcd}\).

Detects true curvature singularities (coordinate-independent). For Schwarzschild: \(K = 12\,r_s^2 / r^6\).