Stefan Förste et al JHEP09(2000)034 doi:10.1088/1126-6708/2000/09/034
Stefan Förste1, Zygmunt Lalak1, Stéphane Lavignac1 and Hans Peter Nilles1
Show affiliationsWe point out several subtleties arising in brane-world scenarios of cosmological constant cancellation. We show that solutions with curvature singularities are inconsistent, unless the contribution to the effective four-dimentional cosmological constant of the physics that resolves the singularities is fine-tuned. This holds for both flat and curved branes. Irrespective of this problem, we then study an isolated class of flat solutions in models where a bulk scalar field with a vanishing potential couples to a 3-brane. We give an example where the introduction of a bulk scalar potential results in a non-zero cosmological constant. Finally we comment on the stability of classical solutions of the brane system with respect to quantum corrections.
E-print Number: hep-th/0006139
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Issue 09 ( 1 September 2000)
Received 21 June 2000, accepted for publication 21 September 2000
Published 3 November 2000
Stefan Förste et al JHEP09(2000)034
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