"Conserved charges" of the Bondi-Metzner-Sachs algebra in the Brans-Dicke theory

Abstract

The asymptotic symmetries in Brans-Dicke theory are analyzed using Penrose's conformal completion method, which is independent of the coordinate system used. These symmetries indeed include supertranslations and Lorentz transformations for an asymptotically flat spacetime. With the Wald-Zoupas formalism, "conserved charges" and fluxes of the Bondi-Metzner-Sachs algebra are computed. The scalar degree of freedom contributes only to the Lorentz boost charge, although it plays a role in various fluxes. The flux-balance laws are further used to constrain displacement memory, spin memory and center-of-mass memory effects.

arXiv comment34 pages, 0 figure. Corrected typos, and added some discussions. Accepted for publication in Chinese Physics C. Minor corrections

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