We report on recent progress in employing the Highly Improved Staggered Quark (HISQ) action introduced by the HPQCD/UKQCD collaboration in simulations with dynamical fermions. The HISQ action is an order a2 Symanzik-improved action with further suppressed taste symmetry violations. The improvement in taste symmetry is achieved by introducing Fat7 smearing of the original gauge links and reunitarization (projection to an element of U(3) or SU(3)) followed by Asq-type smearing. Major challenges for calculating the fermion force are related to the reunitarization step. We present a preliminary study of the HISQ action on two 2+1+1 flavor ensembles with the lattice spacing roughly equivalent to the MILC asqtad a = 0.125 and 0.09 fm ensembles.
|Original language||English (US)|
|Journal||Proceedings of Science|
|State||Published - 2008|
|Event||26th International Symposium on Lattice Field Theory, LATTICE 2008 - Williamsburg, United States|
Duration: Jul 14 2008 → Jul 19 2008
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