A review arguing that technical naturalness, powered by low-energy scale invariance and supersymmetric extra dimensions, is the most promising route to solving the cosmological constant problem.
3-Branes and Uniqueness of the Salam-Sezgin Vacuum
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abstract
We prove the uniqueness of the supersymmetric Salam-Sezgin (Minkowski)_4\times S^2 ground state among all nonsingular solutions with a four-dimensional Poincare, de Sitter or anti-de Sitter symmetry. We construct the most general solutions with an axial symmetry in the two-dimensional internal space, and show that included amongst these is a family that is non-singular away from a conical defect at one pole of a distorted 2-sphere. These solutions admit the interpretation of 3-branes with negative tension.
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Dark Energy and the Symbiosis Between Micro-physics and Cosmology (Naturally)
A review arguing that technical naturalness, powered by low-energy scale invariance and supersymmetric extra dimensions, is the most promising route to solving the cosmological constant problem.