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oai:tsukuba.repo.nii.ac.jp:00007827
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Scaling study of the two-flavor chiral phase transition with the Kogut-Susskind quark action in lattice QCD
Aoki, S.
Fukugita, M.
Hashimoto, S.
Ishizuka, N.
Iwasaki, Y.
岩崎, 洋一
Kanaya, K.
Kuramashi, Y.
Mino, H.
Okawa, M.
Ukawa, A.
宇川, 彰
Yoshie, T.
open access
(c) 1998 The American Physical Society
We report on a study of the two-flavor finite-temperature chiral phase transition employing the Kogut-Susskind quark action and the plaquette gluon action in lattice QCD for a lattice with Nt=4 temporal size. Hybrid R simulations of 104 trajectories are made at quark masses of mq=0.075,0.0375,0.02,0.01 in lattice units for the spatial sizes 8^3,12^3, and 163. The spatial size dependence of various susceptibilities confirm the previous conclusion of the absence of a phase transition down to mq=0.02. At mq=0.01 an increase of susceptibilities is observed up to the largest volume 16^3 explored in the present work. We argue, however, that this increase is likely to be due to an artifact of too small a lattice size and it cannot be taken to be the evidence for a first-order transition. Analysis of critical exponents estimated from the quark mass dependence of susceptibilities shows that they satisfy hyperscaling consistent with a second-order transition located at mq=0. The exponents obtained from larger lattice, however, deviate significantly from both those of O(2), which is the exact symmetry group of the Kogut-Susskind action at finite lattice spacing, and those of O(4) expected from an effective σ model analysis in the continuum limit.
American Physical Society
1998-04
eng
journal article
VoR
http://hdl.handle.net/2241/89393
https://tsukuba.repo.nii.ac.jp/records/7827
https://doi.org/10.1103/PhysRevD.57.3910
2470-0010
AA00773624
Physical review D
57
7
3910
3922
https://tsukuba.repo.nii.ac.jp/record/7827/files/PRD_57-7.pdf
application/pdf
301.1 kB
2013-12-18