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ID 14446
file
creator
Aoki, S.
Fukugita, M.
Hashimoto, S.
Ishizuka, N.
Iwasaki, Y.
Kanaya, K.
Kaneko, T
Kuramashi, Y.
Tsutsui, N.
Ukawa, A.
Yamada, N.
Yoshie, T.
subject
three-flavor lattice QCD
fermion algorithm
Wilson-type fermions
NDC
Physics
abstract
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 (β≲5.0) at relatively heavy quark masses (mPS/mV∼0.74–0.87). Strong metastability persists on a large lattice of size 12[3]×32, which indicates that the transition has a bulk nature. The phase gap becomes smaller toward weaker couplings and vanishes at β≃5.0, which corresponds to a lattice spacing a≃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 (β,κ) 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.
journal title
Physical Review D
volume
Volume 72
issue
Issue 5
start page
054510
date of issued
2005-09
publisher
American Physical Society
issn
1550-7998
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
publisher
rights
Copyright (c) 2005 American Physical Society
relation is version of URL
http://dx.doi.org/10.1103/PhysRevD.72.054510
department
Graduate School of Science