Axion model in extra dimensions with TeV scale gravity

Details Axion model in extra dimensions with TeV scale gravity Axion model in extra dimensions with TeV scale gravity

1999-08-31

arxiv.org/abs/hep-ph/9908515v2

Phys.Rev. D61 (2000) 084005

Physics

High Energy Physics

High Energy Physics - Phenomenology

30 pages 5 figures, a few typo are fixed, one reference added

Scientific paper

10.1103/PhysRevD.61.084005

A simple axion model is proposed in the scenario of large extra dimensions where gravity scale is as low as 1 TeV. To obtain an intermediate-scale decay constant of the axion, the axion is assumed to live in a sub-spacetime (brane) of the whole bulk. In this model there appear Kaluza-Klein modes of the axion which have stronger interaction than those of the graviton. The axion brane plays a role of absorber of the graviton Kaluza-Klein modes. Because of these reasons phenomenology and cosmology of the axion become highly non-trivial. We discuss various cosmological constraints as well as astrophysical ones and show that the model is viable for certain choices of the dimensionality of the axion brane. The structure of the model proposed here provides a viable realization of the fat brane idea to relax otherwise very severe cosmological constraints.

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