TY - JOUR
T1 - Model approach to the sign problem on lattice QCD with theta vacuum
AU - Sasaki, Takahiro
AU - Takahashi, Junichi
AU - Sakai, Yuji
AU - Kouno, Hiroaki
AU - Yahiro, Masanobu
N1 - Funding Information:
This work was supported by JSPS KAKENHI Grant Number 23-2790. The numerical
PY - 2012
Y1 - 2012
N2 - We propose a practical way of circumventing the sign problem in lattice QCD simulations with a theta-vacuum term. This method is the reweighting method for the QCD Lagrangian after the SUA(3)?UA(1) transformation. In the Lagrangian, the P-odd mass term as a cause of the sign problem is minimized. Additionally, we investigate theta-vacuum effects on the QCD phase diagram for the realistic 2+1 flavor system, using the three-flavor Polyakov-extended Nambu-Jona- Lasinio (PNJL) model and the entanglement PNJL model as an extension of the PNJL model. The theta-vacuum effects make the chiral transition sharper. We finally investigate theta dependence of the transition temperature and compare with the result of the pure gauge lattice simulation with imaginary theta parameter.
AB - We propose a practical way of circumventing the sign problem in lattice QCD simulations with a theta-vacuum term. This method is the reweighting method for the QCD Lagrangian after the SUA(3)?UA(1) transformation. In the Lagrangian, the P-odd mass term as a cause of the sign problem is minimized. Additionally, we investigate theta-vacuum effects on the QCD phase diagram for the realistic 2+1 flavor system, using the three-flavor Polyakov-extended Nambu-Jona- Lasinio (PNJL) model and the entanglement PNJL model as an extension of the PNJL model. The theta-vacuum effects make the chiral transition sharper. We finally investigate theta dependence of the transition temperature and compare with the result of the pure gauge lattice simulation with imaginary theta parameter.
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M3 - Conference article
AN - SCOPUS:85030118177
VL - Part F130497
JO - Proceedings of Science
JF - Proceedings of Science
SN - 1824-8039
M1 - 067
T2 - 30th International Symposium on Lattice Field Theory, Lattice 2012
Y2 - 24 June 2012 through 29 June 2012
ER -