2012/04/30 by Zhou Li-juan, Ma Wei-xing, Leonard S. Kisslinger
Physics and Astronomy · #astro-ph.CO #hep-ph
published as J. Mod. Phys. 2012, 3, 1172 · 12 pages, no figures. arXiv admin note: text overlap with arXiv:nucl-th/0404015, arXiv:1010.1339, arXiv:0906.2162
arxiv created 2012/05/24 · arxiv updated 2013/06/17
Based on the Veneziano ghost theory of QCD, we estimate the cosmological constant Λ, which is related to the vacuum energy density, ρΛ, by Λ= 8πG ρΛ. In the recent Veneziano ghost theory ρΛ is given by the absolute value of the product of the local quark condensate and quark current mass:ρΛ = \frac2NfHmη'c |mq<0|:qq:|0>|. By solving Dyson-Schwinger Equations for a dressed quark propagator, we found the local quark condensate <0|:qq:|0> ≃ -(235 MeV)3, the generally accepted value. The quark current mass is mq ≃ 4.0 Mev. This gives the same result for ρΛ as found by previous authors, which is somewhat larger than the observed value. However, when we make use of the nonlocal quark condensate, <0|:q(x)q(0):|0>= g(x)<0|:qq:|0>, with g(x) estimated from our previous work, we find Λ is in a good agreement with the observations.