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We investigate a scenario with two $AdS_4$ branes in an $AdS_5$ bulk. In thisscenario there are two gravitons and we investigate the role played by each ofthem for different positions of the second brane. We show that both gravitonsplay a significant role only when the turn-around point in the warp factor isapproximately equidistant from both branes. We find that the ultralight modebecomes heavy as the second brane approaches the turn-around point, and thephysics begins to resemble that of the RS model. Thus we demonstrate thecrucial role played by the turn-around in the warp factor in enabling thepresence of both gravitons.Comment: 21 pages, late

A Closer Look at TwoAdS4Branes in anAdS5Bulk

A Closer Look at TwoAdS₄Branes in anAdS₅Bulk