Abstract
We study the vacuum structure in QCD in a nonperturbative manner using a variational approach with gluon condensates. We show that in Coulomb gauge as the coupling becomes moderately strong, the perturbative vacuum of QCD becomes unstable leading to gluon condensates and a gauge dependent effective mass for the gluons related to the gauge independent value of 〈vac‖G aμν G aμν‖vac〉 of Shifmanet al.
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Mishra, A., Mishra, H., Misra, S.P. et al. A nonperturbative variational approach to the vacuum structure in quantum chromodynamics. Pramana - J. Phys 37, 59–70 (1991). https://doi.org/10.1007/BF02847578
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DOI: https://doi.org/10.1007/BF02847578