Axionic dark energy and a composite QCD axion
Abstract
We discuss the idea that the model-independent (MI) axion of string theory is the source of quintessential dark energy. The scenario is completed with a composite QCD axion from hidden sector squark condensation that could serve as dark matter candidate. The mechanism relies on the fact that the hidden sector anomaly contribution to the composite axion is much smaller than the QCD anomaly term. This intuitively surprising scenario is based on the fact that below the hidden sector scale Λh there are many light hidden sector quarks. Simply, by counting engineering dimensions the hidden sector instanton potential can be made negligible compared to the QCD anomaly term.
- Publication:
-
Journal of Cosmology and Astroparticle Physics
- Pub Date:
- May 2009
- DOI:
- 10.1088/1475-7516/2009/05/010
- arXiv:
- arXiv:0902.3610
- Bibcode:
- 2009JCAP...05..010K
- Keywords:
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- High Energy Physics - Theory;
- Astrophysics - Cosmology and Extragalactic Astrophysics;
- General Relativity and Quantum Cosmology;
- High Energy Physics - Phenomenology
- E-Print:
- 9 pages, 7 figures