A nonperturbative variational approach to the vacuum structure in quantum chromodynamics |
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| Authors: | A Mishra H Mishra S P Misra S N Nayak |
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| Affiliation: | (1) Physics Department, Utkal University, 751 004 Bhubaneswar, India;(2) Institute of Physics, 751 005 Bhubaneswar, India |
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| 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 μν a G aμν‖vac〉 of Shifmanet al. |
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| Keywords: | Quantum chromodynamics vacuum structure phase transition Bogoliubov transformation variational methods |
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