Axionic dark energy and a composite QCD axion

Details Axionic dark energy and a composite QCD axion Axionic dark energy and a composite QCD axion

2009-02-20

arxiv.org/abs/0902.3610v1

JCAP 0905:010,2009

Physics

High Energy Physics

High Energy Physics - Theory

9 pages, 7 figures

Scientific paper

10.1088/1475-7516/2009/05/010

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 $\Lambda_h$ 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.

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