Lorentzian Manifolds, including: Wormhole, Alcubierre Drive, Gravitational Singularity, Minkowski Space, Closed Timelike Curve, Pseudo-riemannian ... Spacetime, Asymptotically Flat Spacetime

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More info: In differential geometry, a pseudo-Riemannian manifold (also called a semi-Riemannian manifold) is a generalization of a Riemannian manifold. It is one of many mathematical objects named after Bernhard Riemann. The key difference between a Riemannian manifold and a pseudo-Riemannian manifold is that on a pseudo-Riemannian manifold the metric tensor need not be positive-definite. Instead a weaker condition of nondegeneracy is imposed.