Hidden sector axions: physics and cosmology

Details Hidden sector axions: physics and cosmology Hidden sector axions: physics and cosmology

2003-07-25

arxiv.org/abs/hep-ph/0307312v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Contribution to the Proceedings of SUGRA20, International Conference 20 Years of SUGRA and Search for SUSY and Unification, No

Scientific paper

Embedding hidden sector supergravity models in the framework of string theory leads to the appearance of axion-like degrees of freedom. Among them is the model independent axion of heterotic string theory. It has a decay constant of order of the Planck scale and could play the role of a quintessence field. In models allowing for the required $\mu$ term in the TeV range, the hidden sector dynamics leads to a vacuum energy of $(0.003 {\rm eV})^4$ via a multiple see-saw effect. A solution to the strong CP-problem is provided by an additional hidden sector pseudoscalar with properties that make it an acceptable candidate for cold dark matter of the universe.

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