Homogeneous Projective Coordinates for the Bondi-Metzner-Sachs Group

Esposito, G.; Vitale, G.F. Homogeneous Projective Coordinates for the Bondi–Metzner–Sachs Group. Symmetry 2024, 16, 867. Esposito, G.; Vitale, G.F. Homogeneous Projective Coordinates for the Bondi–Metzner–Sachs Group. Symmetry 2024, 16, 867.

Abstract

This paper studies the Bondi-Metzner-Sachs group in homogeneous projective coordinates, because it is then possible to write all transformations of such a group in a manifestly linear way. The 2-sphere metric, Bondi-Metzner-Sachs metric, asymptotic Killing vectors, generators of supertranslations, as well as boosts and rotations of Minkowski spacetime, are all re-expressed in homogeneous projective coordinates. Last, the integral curves of vector fields which generate supertranslations are evaluated in detail. This work prepares the ground for more advanced applications of the differential geometry of asymptotically flat spacetimes in projective coordinates.

Keywords

Vector fields; Bondi-Metzner-Sachs group; homogeneous projective coordinates

Subject

Physical Sciences, Mathematical Physics

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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