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.
|ジャーナル||Proceedings of Science|
|出版ステータス||出版済み - 1 1 2012|
|イベント||30th International Symposium on Lattice Field Theory, Lattice 2012 - Cairns, オーストラリア|
継続期間: 6 24 2012 → 6 29 2012
All Science Journal Classification (ASJC) codes