TL;DR
This paper explores a self-tuning flat brane solution in an infinite-volume setup with bulk supersymmetry, which stabilizes the brane cosmological constant and suggests the necessity of conformal brane matter for consistent coupling.
Contribution
It introduces a self-tuning flat brane solution in an infinite-volume setup with bulk supersymmetry, highlighting the role of conformal matter for consistency.
Findings
The solution is free of singularities.
The brane cosmological constant is protected by bulk supersymmetry.
Conformal brane matter appears necessary for consistent coupling.
Abstract
We consider an infinite-volume brane world setup where a codimension one brane is coupled to bulk gravity plus a scalar field with vanishing potential. The latter is protected by bulk supersymmetry, which is intact even if brane supersymmetry is completely broken as the volume of the extra dimension is infinite. Within this setup we discuss a flat solution with a ``self-tuning'' property, that is, such a solution exists for a continuous range of values for the brane tension. This infinite-volume solution is free of any singularities, and has the property that the brane cosmological constant is protected by bulk supersymmetry. We, however, also point out that consistency of the coupling between bulk gravity and brane matter generically appears to require that the brane world-volume theory be conformal.
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