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Fisher's zeros as boundary of RG flows in complex coupling space
Conference proceeding   Open access

Fisher's zeros as boundary of RG flows in complex coupling space

A. Bazavov, A. Denbleyker, Daping Du, Yuzhi Liu, Y. Meurice and Haiyuan Zou
The XXVIII International Symposium on Lattice Field Theory (Lattice 2010) - THEORETICAL DEVELOPMENTS
Proceedings of Science, v. 105
06/06/2011
DOI: 10.22323/1.105.0259
url
https://doi.org/10.22323/1.105.0259View
Published (Version of record) Open Access

Abstract

We discuss the possibility of extending the RG flows to complex coupling spaces. We argue that the Fisher's zeros are located at the boundary of the complex basin of attraction of IR fixed points. We support this picture with numerical calculations at finite volume for2D O(N) models in the large-N limit and the hierarchical Ising model using the two-lattice matching method. We present numerical evidence supporting the idea that, as the volume increases, the Fisher's zeros of 4-dimensional pure gauge SU(2) lattice gauge theory with a Wilson action, stabilize at a distance larger than 0.1 from the real axis in the complex beta=4/g^2 plane. We show that when a positive adjoint term is added, the zeros get closer to the real axis. We compare the situation with the U(1) case. We discuss the implications of this new framework for proofs of confinement and searches for nontrivial IR fixed points in models beyond the standard model.
 High Energy Physics Lattice Theory

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