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arXiv · 1602.06557

Invisible QCD as Dark Energy

Stephon Alexander·Antonino Marcianò·Zhi Yang
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Abstract

We account for the late time acceleration of the Universe by extending the QCD color to a $SU(3)$ invisible sector (IQCD). If the Invisible Chiral symmetry is broken in the early universe, a condensate of dark pions (dpions) and dark gluons (dgluons) forms. The condensate naturally forms due to strong dynamics similar to the Nambu--Jona-Lasinio mechanism. As the Universe evolves from early times to present times the interaction energy between the dgluon and dpion condensate dominates with a negative pressure equation of state and causes late time acceleration. We conclude with a stability analysis of the coupled perturbations of the dark pions and dark gluons.

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Stephon Alexander, Antonino Marcianò, Zhi Yang. 2016-02-21. Invisible QCD as Dark Energy. https://arxiv.org/abs/1602.06557

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