Preweighting method in Monte-Carlo sampling with complex action

• 市原, 輝一

  Yukawa Institute for Theoretical Physics, Kyoto University

• 大西, 明

  Department of Physics, Kyoto University・Yukawa Institute for Theoretical Physics, Kyoto University

抄録

We investigate the QCD phase diagram in the strong-coupling lattice QCD with fluctuation and 1/g² effects by using the auxiliary field Monte-Carlo simulations. The complex phase of the Fermion determinant at finite chemical potential is found to be suppressed by introducing a complex shift of integral path for one of the auxiliary fields, which corresponds to introducing a repulsive vector mean field for quarks. The obtained phase diagram in the chiral limit shows suppressed Tc in the second order phase transition region compared with the strong-coupling limit results. We also argue that we can approximately guess the statistical weight cancellation from the complex phase in advance in the case where the complex phase distribution is Gaussian. We demonstrate that correct expectation values are obtained by using this guess in the importance sampling (preweighting).

The 33rd International Symposium on Lattice Field Theory, 14 -18 July 2015, Kobe International Conference Center, Kobe, Japan - Nonzero Temperature and Density (talks).

収録刊行物

• Proceedings of Science

  Proceedings of Science 251 2016-07-15

  Sissa Medialab

詳細情報

• CRID: 1050001335862962048
• NII論文ID: 120006497352
• ISSN: 18248039
• HANDLE: 2433/233618
• 本文言語コード: en
• 資料種別: journal article
• データソース種別:
  • IRDB
  • CiNii Articles