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maximally symmetric Lorentzian manifold（英语：Lorentzian manifold） with constant positive scalar curvature（英语：scalar curvature）. It is the Lorentzian analogue of
1002/prop.201300020. Lorentzian wormholes are not traversable1 Einstein, A.; Rosen, N. The Particle Problem in the General Theory of Relativity. Physical Review
Quantum Constraint for the Physical Viability of Classical Traversable Lorentzian Wormholes. arXiv eprint server. [2005-08-12]. （原始内容存档于2017-07-02）. Ori
时间旅行
Collected works, Volume II (S. Feferman et al., eds). Visser, Matt. Lorentzian Wormholes. Springer-Verlag. 1996. ISBN 1-56396-653-0. Cramer, John G
因果结构
1936. R.D. Sorkin; E. Woolgar. A Causal Order for Spacetimes with C^0 Lorentzian Metrics: Proof of Compactness of the Space of Causal Curves. 1999. arXiv:gr-qc/95080183