On boundary terms and conformal transformations in curved space-times

Details On boundary terms and conformal transformations in curved space-times On boundary terms and conformal transformations in curved space-times

2001-07-24

arxiv.org/abs/gr-qc/0107077v1

Int.J.Mod.Phys. D11 (2002) 703-714

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

LaTeX 2e, 12 pages, no figures

Scientific paper

10.1142/S0218271802001913

We intend to clarify the interplay between boundary terms and conformal transformations in scalar-tensor theories of gravity. We first consider the action for pure gravity in five dimensions and show that, on compactifing a la Kaluza-Klein to four dimensions, one obtains the correct boundary terms in the Jordan (or String) Frame form of the Brans-Dicke action. Further, we analyze how the boundary terms change under the conformal transformations which lead to the Pauli (or Einstein) frame and to the non-minimally coupled massless scalar field. In particular, we study the behaviour of the total energy in asymptotically flat space-times as it results from surface terms in the Hamiltonian formalism.

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