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Based on the Veneziano ghost theory of QCD, we predict the cosmological constant Л, which is related to energy density of cosmological vacuum by $$ \Lambda = \frac{{8\pi G}} {3}\rho _\Lambda $$ . In the Veneziano ghost theory, the vacuum energy density ρЛ is expressed by absolute value of the product of quark vacuum condensate and quark current mass: $$ \rho _\Lambda = \frac{{2N_f H}} {{m_{\eta...
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