We account for the late time acceleration of the Universe by extending the Quantum Chromodynamics (QCD) color to a $SU\left(3\right)$ 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.

中文翻译：

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隐形QCD作为暗能量

我们通过将量子色动力学（QCD）颜色扩展为 $\mathrm{小号}ü（3）$ 隐形扇区（IQCD）。如果在早期宇宙中打破了看不见的手征对称性，就会形成深色介子（dpions）和深色胶子（dgluons）的冷凝物。凝结水由于类似于Nambu-Jona-Lasinio机理的强大动力而自然形成。随着宇宙从早期到现在的发展，dgluon和dpion冷凝物之间的相互作用能以状态的负压方程为主，并导致后期加速。我们以暗介子和暗胶子的耦合扰动的稳定性分析作为结束。