出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We present a version of the Lüscher-Weisz multilevel algorithm ideally suited for studying excited
states of the QCD flux tube. While the original version achieved error reduction only in the
temporal direction, the new algorithm reduces fluctuations in the sources as well. We report on
the implementation of this algorithm as well as improvement over the older method. We also
present first results, where we see a good agreement with theoretical predictions from bosonic
string models.
