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Topological susceptibility from overlap fermion
Authors:Ying He-Ping and Zhang Jian-Bo
Affiliation:Zhejiang Institute of Modern Physics, Zhejiang University, Hangzhou 310027, China
Abstract:We numerically calculate the topological charge of the gauge configurations on a finite lattice by the fermionic method with overlap fermions. By using the lattice index theorem, we identify the index of the massless overlap fermion operator to the topological charge of the background gauge configuration. The resulting topological susceptibility χ is in good agreement with the anticipation made by Witten and Veneziano.
Keywords:lattice QCD   topological charge   overlap fermion
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