The five dimensional universal hypermultiplet and the cosmological constant problem

Abstract

We model the universe as a 3-brane embedded in five dimensional spacetime with N=2 supersymmetry. The presence of the scalar fields of the universal hypermultiplet in the bulk results in a positive pressure effectively reducing the value of the cosmological constant and thereby providing a possible answer as to why the measured value of the cosmological constant is many orders of magnitude smaller than predicted from the vacuum energy. The solution allows for any number of parallel branes to exist and relates their cosmological constants (as well as matter densities and radiation pressures) to the value of the dilaton in the extra dimension. The results we find can be thought of as first order approximations, satisfying supersymmetry breaking and the Bogomol'nyi-Prasad-Sommerfield (BPS) conditions in the bulk only.

References in corpus (9)

• Seven-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• How flat can you get? A model comparison perspective on the curvature of the Universe
• Braneworlds in six dimensions: new models with bulk scalars
• The many symmetries of Calabi-Yau compactifications
• Split-complex representation of the universal hypermultiplet
• Self-accelerated brane Universe with warped extra dimension
• Zero-branes and the symplectic hypermultiplets
• Brane Cosmology for Vacuum and Cosmological Constant Bulk

Cited by in corpus (4)

• Brane-Worlds and the Calabi-Yau Complex Structure Moduli
• BPS brane cosmology in N=2 supergravity
• The Cosmological Constant Problem and the Extra Dimensions of $\mathcal{N}=2$ $\mathcal{D}=5$ Supergravity
• The Hierarchy Problem and $\mathcal{N}=2$ $\mathcal{D}=5$ Supergravity