Dark energy and QCD ghost

By N. Ohta. 2010

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Abstract 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 Letter, 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 Λ QCD 3 ( Λ QCD is the QCD mass scale) which has the right magnitude ∼ ( 3 × 10 − 3 eV ) 4 .

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/f5567001d3f18fa24c5f9e7cf18a0d885a555604