Dark Energy and QCD Ghost
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It has been suggested that the dark energy that explains the observed accelerating expansion of the universe may arise due to the contribution to the vacuum energy of the QCD ghost in a time-dependent background. The argument uses a four-dimensional simplified model. In this paper, we put the discussion in more realistic model keeping all components of the QCD vector ghost and show that indeed QCD ghost produces dark energy proportional to the Hubble parameter $H\Lambda_{QCD}^3$ ($\Lambda_{QCD}$ is the QCD mass scale) which has the right magnitude $\sim (3\times 10^{-3}$ eV)$^4$.
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Cited by 1 Pith paper
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Late-Time Cosmic Acceleration from QCD Confinement Dynamics
Phenomenological extension of the PNJL model introduces a curvature-sensitive term proportional to (H/H0)^d that behaves as effective dark energy at late times and fits low-redshift data competitively with ΛCDM.
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