Abstract
Any conformal or projective structure on a manifold ℳ defines a natural boundary ∂ℳ. For Minkowski space these coincide with null infinity as defined by Penrose and projective infinity as defined by Eardley and Sachs, respectively.
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Communicated by J. Ehlers
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Schmidt, B.G. A new definition of conformal and projective infinity of space-times. Commun.Math. Phys. 36, 73–90 (1974). https://doi.org/10.1007/BF01646026
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DOI: https://doi.org/10.1007/BF01646026