Model approach to the sign problem on lattice QCD with theta vacuum

Takahiro Sasaki, Junichi Takahashi, Yuji Sakai, Hiroaki Kouno, Masanobu Yahiro

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)


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.

Original languageEnglish
Article number067
JournalProceedings of Science
VolumePart F130497
Publication statusPublished - 2012
Event30th International Symposium on Lattice Field Theory, Lattice 2012 - Cairns, Australia
Duration: Jun 24 2012Jun 29 2012

All Science Journal Classification (ASJC) codes

  • General


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