Hypercubic smeared links for dynamical fermions

We investigate a variant of hypercubic gauge link smearing where the SU(3) projection is replaced with a normalization to the corresponding unitary group. This smearing is differentiable and thus suitable for use in dynamical fermion simulations using molecular dynamics type algorithms. We show that this smearing is as efficient as projected hypercubic smearing in removing ultraviolet noise from the gauge fields. We test the normalized hypercubic smearing in dynamical improved (clover) Wilson and valence overlap simulations.

[1]  F. Knechtli,et al.  Flavor symmetry and the static potential with hypercubic blocking , 2001, hep-lat/0103029.

[2]  Colin Morningstar,et al.  Analytic smearing of SU(3) link variables in lattice QCD , 2004 .

[3]  R. Petronzio,et al.  Stability of lattice QCD simulations and the thermodynamic limit , 2005, hep-lat/0512021.

[4]  R. Petronzio,et al.  QCD with light Wilson quarks on fine lattices (II): DD-HMC simulations and data analysis , 2007, hep-lat/0701009.

[5]  Massimo Bernaschi,et al.  Glueball masses and string tension in lattice QCD , 1987 .

[6]  Quark condensate in two-flavor QCD , 2006, hep-th/0605147.

[7]  Chiral properties of two-flavor QCD in small volume and at large lattice spacing , 2005, hep-lat/0506021.

[8]  Physics issues in simulations with dynamical overlap fermions , 2004, hep-lat/0412005.

[9]  R. Hoffmann,et al.  The static potential with hypercubic blocking , 2001 .

[10]  T. DeGrand,et al.  Investigating and optimizing the chiral properties of lattice fermion actions , 1998, hep-lat/9809097.

[11]  D. Toussaint,et al.  Variants of fattening and flavor symmetry restoration , 1999, hep-lat/9903032.

[12]  Herbert Neuberger.  Exactly massless quarks on the lattice , 1998 .

[13]  Simulating an arbitrary number of flavors of dynamical overlap fermions , 2006, hep-lat/0604015.

[14]  R. Sommer.  A new way to set the energy scale in lattice gauge theories and its application to the static force and σs in SU (2) Yang-Mills theory , 1994 .

[15]  Topology with dynamical overlap fermions , 2006, hep-lat/0510117.

[16]  Stefano Capitani,et al.  Rationale for UV-filtered clover fermions , 2006 .