Geodesic
Repulsion in an instanton gas, formation of a core in the nucleon, and the method of Bogolyubov hierarchies
Teoretičeskaâ i matematičeskaâ fizika, Tome 86 (1991) no. 1, pp. 31-42 Cet article a éte moissonné depuis la source Math-Net.Ru

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The effective action of the instanton gas in QCD with allowance for repulsion between the instantons is found. This repulsion leads to the formation of a repulsive core of the constituent quarks. The structure of the effective action is similar to an operator expansion. The method of Bogolyubov hierarchies is used to find the coefficient functions. 
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     title = {Repulsion in an~instanton gas, formation of a~core in the nucleon, and the method of {Bogolyubov} hierarchies},
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I. V. Musatov; A. N. Tavkhelidze; V. F. Tokarev. Repulsion in an instanton gas, formation of a core in the nucleon, and the method of Bogolyubov hierarchies. Teoretičeskaâ i matematičeskaâ fizika, Tome 86 (1991) no. 1, pp. 31-42. http://geodesic.mathdoc.fr/item/TMF_1991_86_1_a2/

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