A determination of <A^2> and the non-perturbative vacuum energy of Yang-Mills theory in the Landau gauge

Physics – High Energy Physics – High Energy Physics - Theory

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12 pages, 3 eps figures; v2 : wrong use of "enhancement" instead of "suppression" corrected; v3: version accepted for publicat

Scientific paper

10.1016/S0370-2693(03)00541-0

We discuss the 2-point-particle-irreducible (2PPI) expansion, which sums bubble graphs to all orders, in the context of SU(N) Yang-Mills theory in the Landau gauge. Using the method we investigate the possible existence of a gluon condensate of mass dimension two, , and the corresponding non-zero vacuum energy. This condensate gives rise to a dynamically generated mass for the gluon.

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