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The contributions of confining as well as nonconfining nonperturbativeself-interactions of stochastic background fields to the shear and bulkviscosities of the gluon plasma in SU(3) Yang-Mills theory are calculated. Thenonconfining self-interactions change (specifically, diminish) the values ofthe shear and bulk viscosities by 15%, that is close to the 17% which thestrength of the nonconfining self-interactions amounts of the full strength ofnonperturbative self-interactions. The ratios to the entropy density of theobtained nonperturbative contributions to the shear and bulk viscosities arecompared with the results of perturbation theory and the predictions of {\calN}=4 SYM.

Contributions of stochastic background fields to the shear and bulk viscosities of the gluon plasma