Brane World Scenarios and the Cosmological Constant

Details Brane World Scenarios and the Cosmological Constant Brane World Scenarios and the Cosmological Constant

2000-02-21

arxiv.org/abs/hep-th/0002174v5

Nucl.Phys. B597 (2001) 263-278

Physics

High Energy Physics

High Energy Physics - Theory

Expanded discussion of the brane world scenario in type IIB. Version to be published in Nuclear Physics B

Scientific paper

10.1016/S0550-3213(00)00747-1

Brane world scenarios offer a way of ensuring that a Poincare invariant four dimensional world can emerge, without fine tuning, as a solution to the equations of motion of an effective action. We discuss the different ways in which this happens, and point out that the underlying reason is that there is a contribution to the effective cosmological constant which is a constant of integration, that maybe adjusted to ensure a flat space solution. Basically this is an old idea revived in a new context and we speculate that there may be string scenarios that provide a concrete realization of it. Finally we discuss to what extent this is a solution to the cosmological constant problem.

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