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Quark Propagation in the Presence of a A_μ^aA_a^μ> Condensate

Xiangdong Li·C. M. Shakin
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Abstract

There is a good deal of current interest in the condensate g^2A_μ^aA_a^μ> which has recently be shown to be the Landau gauge version of a more general gauge-invariant expression. In the present work we consider quark propagation in the presence of such a condensate which we assume to be present in the vacuum. We describe the vacuum as a random medium of gluon fields. We discuss quark propagation in that medium and show that the quark propagator has no on-mass-shell pole indicating that a quark cannot propagate over extended distances. That is, the quark is a nonpropagating mode in the gluon condensate.

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Xiangdong Li, C. M. Shakin. 2004-09-20. Quark Propagation in the Presence of a A_μ^aA_a^μ> Condensate. https://doi.org/10.1103/physrevd.70.114011

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