2003/03/31 by Kei-ichi Maeda, Shuntaro Mizuno, Takashi Torii · 1 citation
Physics and Astronomy · #gr-qc #astro-ph #hep-ph #hep-th
paper · pdf · doi:10.1103/physrevd.68.024033
published as Phys.Rev.D68:024033,2003 · 8 pages, 1 figure, final version to appear in Physical Review D
arxiv created 2003/06/07 · arxiv updated 2011/05/05
We present the effective equations to describe the four-dimensional gravity of a brane world, assuming that a five-dimensional bulk spacetime satisfies the Einstein equations and gravity is confined on the Z2 symmetric brane. Applying this formalism, we study the induced-gravity brane model first proposed by Dvali, Gabadadze and Porrati. In a generalization of their model, we show that an effective cosmological constant on the brane can be extremely reduced in contrast to the case of the Randall-Sundrum model even if a bulk cosmological constant and a brane tension are not fine-tuned.