Nonlocal gluon condensate within a constrained instanton modelстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:We suggest a constrained instanton (CI) solution in the physical QCD vacuum which is described
by large-scale vacuum eld fluctuations. This solution decays exponentially at large distances. It is stable only if the interaction of the instanton with the background vacuum eld is small and additional constraints are introduced. The CI solution is explicitly constructed in the ansatz form, and the two-point vacuum correlator of the gluon eld strengths is calculated in the framework of the eective instanton vacuum model. At small distances the results are qualitatively similar to the single instanton case; in particular,
the D1 invariant structure is small, which is in agreement with the lattice calculations.