Gravitational memory effects in <scp>Brans‐Dicke</scp> theory

Abstract

There exist gravitational memory effects in Brans‐Dicke theory. They are closely related to the Bondi‐Metzner‐Sachs symmetries present on the null infinity in an isolated system. By studying the asymptotically flat spacetime in Brans‐Dicke theory and the asymptotic symmetries, one discovers that the displacement memory effect in the tensor sector is due to the vacuum transition caused by the null energy fluxes penetrating the null infinity, while in the scalar sector, the vacuum transition is due to the angular momentum fluxes. Together with the spin and the center‐of‐mass memory effects, the displacement memories are constrained by various flux‐balance laws.

Topics & Concepts