Dynamical overlap fermion at fixed topology

Details Dynamical overlap fermion at fixed topology Dynamical overlap fermion at fixed topology

2006-10-02

arxiv.org/abs/hep-lat/0610011v1

PoSLAT2006:052,2006

Physics

High Energy Physics

High Energy Physics - Lattice

7 pages, 4 figures, talk presented at Lattice 2006 (chiral symmetry); to appear in Proceedings of Science, PoS(LAT2006)052

Scientific paper

We launched a project to perform dymanical fermion simulations using the overlap fermion formulation for sea quarks. In order to avoid the appearace of near-zero modes of the hermitian Wilson-Dirac operator $H_W$, we introduce a pair of extra Wilson fermions with a large negative mass term. Crossing of the topological boundary is then strictly prohibited, and the topological charge is conserved during simulations. It makes the simulations substantially faster compared to the algorithms which allow the topology change. We discuss on the finite volume effects due to the fixed global topology.

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