Dynamical overlap fermion at fixed topology

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

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006slft.confe..52h&link_type=abstract

Proceedings of the XXIVth International Symposium on Lattice Field Theory. July 23-28, 2006, Tucson, Arizona., p.52.1

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We launched a project to perform dymanical fermion simulations using the overlap fermion for- mulation for sea quarks. In order to avoid the appearance of near-zero modes of the hermitian Wilson-Dirac operator HW , 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 for a change in topological change. We discuss the finite volume effects due to the fixed global topology.

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