An Effective 3d Rigid String at Θ = Π ∗
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چکیده
An effective sigma model describing behavior of the 3d rigid string with a θ-term at θ = π is proposed. It contains non-perturbative corrections resulting from summation over different genera of the 2d surfaces. The effective theory is the SU (2) WZW model coupled to the Nambu-Goto action. RG analysis shows the existence of a IR fixed point at which the normal to the surface has long range correlations. A similar model can describe critical behaviour of the 3d Y-M fields or the Ising model.
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