A Note on the Integral Formulation of Einstein's Equations Induced on a Braneworld

Details A Note on the Integral Formulation of Einstein's Equations Induced on a Braneworld A Note on the Integral Formulation of Einstein's Equations Induced on a Braneworld

2004-11-08

arxiv.org/abs/gr-qc/0411038v1

Gen.Rel.Grav. 37 (2005) 959-965

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

10 pages, no figures, accepted for publication in the General Relativity and Gravitation Journal

Scientific paper

10.1007/s10714-005-0078-z

We revisit the integral formulation (or Green's function approach) of Einstein's equations in the context of braneworlds. The integral formulation has been proposed independently by several authors in the past, based on the assumption that it is possible to give a reinterpretation of the local metric field in curved spacetimes as an integral expression involving sources and boundary conditions. This allows one to separate source-generated and source-free contributions to the metric field. As a consequence, an exact meaning to Mach's Principle can be achieved in the sense that only source-generated (matter fields) contributions to the metric are allowed for; universes which do not obey this condition would be non-Machian. In this paper, we revisit this idea concentrating on a Randall-Sundrum-type model with a non-trivial cosmology on the brane. We argue that the role of the surface term (the source-free contribution) in the braneworld scenario may be quite subtler than in the 4D formulation. This may pose, for instance, an interesting issue to the cosmological constant problem.

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