Abstract
We prove that any metric of non-positive curvature in the sense of Alexandrov on a compact surface can be isometrically embedded as a convex spacelike Cauchy surface in a flat spacetime of dimension \((2+1).\) The proof follows from polyhedral approximation.
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Acknowledgements
The authors want to thank Giona Veronelli who pointed out an error in a preceding version of this text. Most of this work was achieved when the second author was a post-doc in the AGM institute of the Cergy-Pontoise University. He wants to thank the institution for its support.
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Fillastre, F., Slutskiy, D. Embeddings of non-positively curved compact surfaces in flat Lorentzian manifolds. Math. Z. 291, 149–178 (2019). https://doi.org/10.1007/s00209-018-2076-3
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DOI: https://doi.org/10.1007/s00209-018-2076-3