Weak gravity in DGP braneworld model
arXiv:gr-qc/0305031 · doi:10.1103/PhysRevD.69.024001
Abstract
We analyze the weak gravity in the braneworld model proposed by Dvali-Gabadadze-Porrati, in which the unperturbed background spacetime is given by five dimensional Minkowski bulk with a brane which has the induced Einstein Hilbert term. This model has a critical length scale . Naively, we expect that the four dimensional general relativity (4D GR) is approximately recovered at the scale below . However, the simple linear perturbation does not work in this regime. Only recently the mechanism to recover 4D GR was clarified under the restriction to spherically symmetric configurations, and the leading correction to 4D GR was derived. Here, we develop an alternative formulation which can handle more general perturbations. We also generalize the model by adding bulk cosmological constant and the brane tension.
7 pages, 1 figure, references added
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