Four-loop free energy for the 2D O(n) non-linear σ-model with 0-loop and 1-loop Symanzik improved actions
نویسندگان
چکیده
منابع مشابه
-loop Improved Lattice Action for the Nonlinear Σ-model *
In this paper we show the Wilson effective action for the 2-dimensional O(N + 1)-symmetric lattice non-linear σ-model computed in the 1-loop approximation for the nonlinear choice of blockspin Φ(x), Φ(x) = Cφ(x)/|Cφ(x)|,where C is averaging of the fundamental field φ(z) over a square x of sideã. The result for S ef f is composed of the classical perfect action with a renormalized coupling const...
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ژورنال
عنوان ژورنال: Nuclear Physics B
سال: 1999
ISSN: 0550-3213
DOI: 10.1016/s0550-3213(99)00604-5