Axions as Quintessence in String Theory

Details Axions as Quintessence in String Theory Axions as Quintessence in String Theory

2010-11-26

arxiv.org/abs/1011.5877v2

Phys.Rev.D83:083506,2011

Physics

High Energy Physics

High Energy Physics - Theory

41 pages, 1 figure, v2: references added

Scientific paper

10.1103/PhysRevD.83.083506

We construct a model of quintessence in string theory based on the idea of axion monodromy as discussed by McAllister, Silverstein and Westphal arXiv:0808.0706. In the model, the quintessence field is an axion whose shift symmetry is broken by the presence of 5-branes which are placed in highly warped throats. This gives rise to a potential for the axion field which is slowly varying, even after incorporating the effects of moduli stabilization and supersymmetry breaking. We find that the resulting time dependence in the equation of state of Dark Energy is potentially detectable, depending on the initial conditions. The model has many very light extra particles which live in the highly warped throats, but these are hard to detect. A signal in the rotation of the CMB polarization can also possibly arise.

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