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A new technique for studying asymptotic questions in general relativity is presented. Points at infinity are introduced which constitute a null hypersurface boundary to space-time. This is studied from the point of view of its conformal structure and some new light is shed on the following questions: (1) asymptotic flatness, (2) gravitational radiation fields, (3) peeling off property of the Riemann tensor, (4) total energy-momentum with integral conservation laws, (5) characteristic initial value problem and (6) Bondi-Metzner-Sachs asymptotic symmetry group. (Author)
Roger Penrose (Tue,) studied this question.