出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：Several smearing recipes (APE, stout, and a new LOG smearing) are discussed and compared,
without and with the hypercubic nesting trick, which may be applied to each one of them. While
theU(1) projection in the APE recipe creates a challenge in dening the derivative of the smeared
link with respect to the original one, the latter two recipes yield differentiable fat links. This makes
them interesting for building UV-ltered fermion actions which can be simulated with a HMC
algorithm. This contribution discusses the plaquette distribution and how it is affected by these
recipes and their hypercubic descendents. Subsequently, the issue of how light a pion one may
simulate in the quenched approximation with such low-cost nearly-chiral actions is addressed.
