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Lorentz surface
In mathematics, a Lorentz surface is a two-dimensional oriented smooth manifold with a conformal equivalence class of Lorentzian metrics. It is the analogue of a Riemann surface in indefinite signature.
Further reading
Smyth, Robert W. (March 2002), "Completing the conformal boundary of a simply connected Lorentz surface" (PDF), Proceedings of the American Mathematical Society 130 (3): 841–847, doi:10.1090/S0002-9939-01-06067-1, retrieved 11 May 2011
Weinstein, Tilla (July 1996), An introduction to Lorentz surfaces, De Gruyter Expositions in Mathematics 22, Walter de Gruyter, ISBN 978-3-11-014333-1
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