Localization of Gravity on Brane Embedded in $Ad{S}_5$ and $d{S}_5$

Abstract

We address the localization of gravity on the Friedmann-Robertson-Walker type brane embedded in either $Ad{S}_5$ or $d{S}_5$ bulk space,and derive two definite limits between which the value of the bulk cosmological constant has to lie in order to localize the graviton on the brane.The lower limit implies that the brane should be either $d{S}_4$ or 4d Minkowski in the $Ad{S}_5$ bulk.The positive upper limit indicates that the gravity can be trapped also on curved brane in the $d{S}_5$ bulk space.Some implications to recent cosmological scenarios are also discussed.

18 pages, 3 figures, Latex file

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