Micrometer Gravitinos and the Cosmological Constant

Abstract

We compute the 4--dimensional cosmological constant in string compactifications in which the Standard Model fields live on a non-supersymmetric brane inside a supersymmetric bulk. The cosmological constant receives contributions only from the vacuum energy of the bulk supergravity fields, but not from the vacuum energy of the brane fields. The latter is absorbed in a warp factor. Supersymmetry breaking on the brane at the TeV scale implies supersymmetry breaking in the bulk at the micrometer scale. This produces a tiny cosmological constant that agrees with experiment within a few orders of magnitude. Our argument predicts superpartners of the graviton with mass of order $10^{-3}$ eV. They should be observable in short-distance tests of Einstein Gravity.

estimate in section 4 refined; scale of supersymmetry breaking changes to 2-6 TeV

References in corpus (4)

• A Large Mass Hierarchy from a Small Extra Dimension
• The Cosmic Triangle: Revealing the State of the Universe
• A Small Cosmological Constant from a Large Extra Dimension
• Brane Supersymmetry Breaking

Cited by in corpus (16)

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• Solving the Hierarchy Problem without Supersymmetry or Extra Dimensions: An Alternative Approach
• Four-Dimensional Supergravities from Five-Dimensional Brane Worlds
• Strings, Branes and Extra Dimensions
• A Brane World Perspective on the Cosmological Constant and the Hierarchy Problems
• A Small Cosmological Constant, Grand Unification and Warped Geometry
• Supersymmetric Extra Dimensions: Gravitino Effects in Selectron Pair Production
• Discriminating 4D supersymmetry from its 5D warped version
• Brane Supersymmetry Breaking and the Cosmological Constant: Open Problems
• A Small Cosmological Constant from Warped Compactification with Branes
• Higher-dimensional perturbations of the vacuum energy density
• Remark on Calabi-Yau vacua of the string theory and the cosmological constant problem
• Supersymmetry and Vacuum Energy in Five-Dimensional Brane Worlds
• Why supersymmetry should be restored at the TeV scale