Euclidean scalar field theory in the bi-local approximation
arXiv:1801.08171 · doi:10.1103/PhysRevD.97.085002
Abstract
The blocking step of the renormalization group method is usually carried out by restricting it to fluctuations and to local blocked action. The tree-level, bi-local saddle point contribution to the blocking, defined by the infinitesimal decrease of the sharp cutoff in momentum space, is followed within the three dimensional Euclidean model in this work. The phase structure is changed, new phases and relevant operators are found and certain universality classes are restricted by the bi-local saddle point.
arXiv comment23 pages, 5 figures
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