2004/09/04 by Sinya Aoki, JLQCD collaboration, S. Aoki +13 · 1 citation
Physics and Astronomy · #Condensed matter physics #Fermion #Gauge theory #High-Energy Particle Collisions Research #Lattice (music) #Lattice QCD #Lattice gauge theory #Mathematical physics #Metastability #Order (exchange) #Particle physics #Particle physics theoretical and experimental studies #Phase transition #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum mechanics #Quark #Quenched approximation #hep-lat
paper · pdf · doi:10.1103/physrevd.72.054510
published as Phys.Rev.D72:054510,2005 · REVTeX4, 9 pages, 11 figures
arxiv created 2004/09/04 · openalex publication_date 2005/09/30 · arxiv updated 2011/09/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Three-flavor QCD simulation with the O(a)-improved Wilson fermion action is made employing an exact fermion algorithm developed for an odd number of quark flavors. For the plaquette gauge action, an unexpected first-order phase transition is found in the strong coupling regime (\ensuremathβ\ensuremath\lesssim5.0) at relatively heavy quark masses (mPS/mV\ensuremath∼0.74--0.87). Strong metastability persists on a large lattice of size 123\ifmmode×\else\texttimes\fi32, which indicates that the transition has a bulk nature. The phase gap becomes smaller toward weaker couplings and vanishes at \ensuremathβ\ensuremath≃5.0, which corresponds to a lattice spacing a\ensuremath≃0.1 fm. These results imply that realistic simulations of QCD with three flavors of dynamical Wilson-type fermions at lattice spacings in the range a=0.1--0.2 fm are not possible with the plaquette gauge action. Extending the study to improved gauge actions, we do not observe evidence for first-order phase transition, at least within the (\ensuremathβ,\ensuremathκ) range we explored. This suggests the possibility that the phase transition either moves away or weakens with improved gauge actions. Possible origins of the phase transition are discussed.