Christophe Galfard et al 2006 Class. Quantum Grav. 23 1999 doi:10.1088/0264-9381/23/6/010
Christophe Galfard1, Cristiano Germani1 and Alex Kehagias2
Show affiliationsA cosmological model based on an inhomogeneous D3-brane moving in an AdS5 × S5 bulk is introduced. Although there are no special points in the bulk, the brane universe has a centre and is isotropic around it. The model has an accelerating expansion and its effective cosmological constant is inversely proportional to the distance from the centre, giving a possible geometrical origin for the smallness of a present-day cosmological constant. Besides, if our model is considered as an alternative of early-time acceleration, it is shown that the early stage accelerating phase ends in a dust-dominated FRW homogeneous universe. Mirage-driven acceleration thus provides a dark matter component for the brane universe final state. We finally show that the model fulfils the current constraints on inhomogeneities.
11.25.Wx String and brane phenomenology
95.35.+d Dark matter (stellar, interstellar, galactic, and cosmological)
85A40 Cosmology (For relativistic cosmology, see 83F05)
81T30 String and superstring theories; other extended objects (e.g., branes) (See also 83E30)
Issue 6 (21 March 2006)
Received 24 December 2005, in final form 30 January 2006
Published 28 February 2006
Christophe Galfard et al 2006 Class. Quantum Grav. 23 1999
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