Search for the critical point of lattice QCD at high temperature and density focusing on probability distribution functions

• Project/Area Number: 26400244
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Niigata University
• Principal Investigator: Ejiri Shinji 新潟大学, 自然科学系, 准教授 (10401176)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000); Fiscal Year 2016: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2014: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
• Keywords: 素粒子論 / 計算物理

Outline of Final Research Achievements

We studied quantum chromodynamics (QCD) at high temperature and density by numerical simulations. Treating the quark masses as parameters of the system as well as the temperature and chemical potential, we investigated the nature of phase transitions by calculating probability distribution functions.
We investigated the critical surface which separates the first order transition and crossover regions in the heavy quark region, and demonstrated the usefulness of our method. The pressure gap and the latent heat between the two phases at the first phase transition were calculated when the quark mass is infinite. Furthermore, we tried calculation of thermodynamic quantities using the gradient flow method which has recently attracted attention.

Research Products

• [Journal Article] Energy-momentum tensor correlation function in N_f=2+1 full QCD at finite temperature (2018)
  • Author(s): Yusuke Taniguchi, Shinji Ejiri, Kazuyuki Kanaya, Masakiyo Kitazawa, Asobu Suzuki, Hiroshi Suzuki, Takashi Umeda
  • Journal Title: EPJ Web of Conferences Volume: 175, 07013 Pages: 1-8
  • DOI: 10.1051/epjconf/201817507013
  • Peer Reviewed / Open Access
• [Journal Article] Equation of state in (2+1)-flavor QCD at physical point with improved Wilson fermion action using gradient flow (2018)
  • Author(s): Kazuyuki Kanaya, Shinji Ejiri, Ryo Iwami, Masakiyo Kitazawa, Hiroshi Suzuki, Yusuke Taniguchi and Takash Umeda
  • Journal Title: EPJ Web of Conferences Volume: 175, 07023 Pages: 1-8
  • DOI: 10.1051/epjconf/201817507023
  • Peer Reviewed / Open Access
• [Journal Article] Exploring N_f=2+1 QCD thermodynamics from gradient flow (2017)
  • Author(s): Yusuke Taniguch, Shinji Ejiri, Ryo Iwami, Kazuyuki Kanaya, Masakiyo Kitazawa, Hiroshi Suzuki, Takashi Umeda, and Naoki Wakabayashi
  • Journal Title: Phys. Rev. D Volume: 96, 014509 Issue: 1 Pages: 1-28
  • DOI: 10.1103/physrevd.96.014509
  • Peer Reviewed / Open Access
• [Journal Article] Determination of latent heat at the finite temperature phase transition of SU(3) gauge theory (2017)
  • Author(s): Shinji Ejiri, Ryo Iwami, Mizuki Shirogane, Naoki Wakabayashi, Kazuyuki Kanaya, Masakiyo Kitazawa, Hiroshi Suzuki, Yusuke Taniguchi, Takashi Umeda
  • Journal Title: Proceedings of Science Volume: LATTICE 2016
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Equation of state in (2+1)-flavor QCD with gradient flow (2017)
  • Author(s): Kazuyuki Kanaya, Shinji Ejiri, Ryo Iwami, Masakiyo Kitazawa, Hiroshi Suzuki, Yusuke Taniguchi, Takashi Umeda, Naoki Wakabayashi
  • Journal Title: Proceedings of Science Volume: LATTICE 2016
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Temperature dependence of topological susceptibility using gradient flow (2017)
  • Author(s): Yusuke Taniguchi, Shinji Ejiri, Kazuyuki Kanaya, Masakiyo Kitazawa, Hiroshi Suzuki, Takashi Umeda, Ryo Iwami, Naoki Wakabayashi
  • Journal Title: Proceedings of Science Volume: LATTICE 2016
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] O(4) scaling analysis in two-flavor QCD at finite temperature and density with improved Wilson quarks (2017)
  • Author(s): T. Umeda, S. Ejiri, R. Iwami, K. Kanaya, H. Ohno, A. Uji, N. Wakabayashi, S. Yoshida
  • Journal Title: Proceedings of Science Volume: LATTICE 2016
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Latent heat at the first order phase transition point of the SU(3) gauge theory (2016)
  • Author(s): Mizuki Shirogane, Shinji Ejiri, Ryo Iwami, Kazuyuki Kanaya
  • Journal Title: Physical Review D Volume: 94 Issue: 1 Pages: 1-14
  • DOI: 10.1103/physrevd.94.014506
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Critical point search from an extended parameter space of lattice QCD at finite temperature and density (2016)
  • Author(s): Shinji Ejiri, Ryo Iwami, Norikazu Yamada
  • Journal Title: Nuclear Physics A Volume: 956 Pages: 826-829
  • DOI: 10.1016/j.nuclphysa.2016.01.030
  • Peer Reviewed / Open Access
• [Journal Article] Exploring the nature of chiral phase transition in two-flavor QCD using extra heavy quarks (2016)
  • Author(s): Shinji Ejiri, Ryo Iwami, Norikazu Yamada
  • Journal Title: Physical Review D Volume: 93 Issue: 5 Pages: 054506-054506
  • DOI: 10.1103/physrevd.93.054506
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Towards the QCD equation of state at the physical point using Wilson fermion (2016)
  • Author(s): T. Umeda, S. Ejiri, R. Iwami, K. Kanaya (WHOT-QCD Collaboration)
  • Journal Title: Proceedings of Science Volume: LATTICE 2015
  • NAID: 120006800805
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Analytic continuation of finite density QCD with heavy quarks in the strong coupling region (2016)
  • Author(s): Shinji Ejiri, Hiroshi Yoneyama
  • Journal Title: Proceedings of Science Volume: LATTICE 2015
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Many flavor approach to study the critical point in finite density QCD (2016)
  • Author(s): Ryo Iwami, Shinji Ejiri, Norikazu Yamada
  • Journal Title: Proceedings of Science Volume: LATTICE 2015
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Many flavor approach to study the nature of chiral phase transition of two-flavor QCD (2016)
  • Author(s): Norikazu Yamada, Shinji Ejiri, Ryo Iwami
  • Journal Title: Proceedings of Science Volume: LATTICE 2015
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Multipoint reweighting method and its applications to lattice QCD (2015)
  • Author(s): R. Iwami, S. Ejiri, K. Kanaya, Y. Nakagawa, D. Yamamoto, and T. Umeda
  • Journal Title: Phys. Rev. D Volume: 92 Issue: 9 Pages: 094507-094507
  • DOI: 10.1103/physrevd.92.094507
  • NAID: 120007135794
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Multipoint reweighting method and beta functions for the calculation of QCD equation of state (2015)
  • Author(s): R. Iwami, S. Ejiri, K. Kanaya, Y. Nakagawa, T. Umeda, D. Yamamoto (WHOT-QCD Collaboration)
  • Journal Title: Proceedings of Science Volume: LATTICE 2014
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] First order transition regions in the quark masses and chemical (2015)
  • Author(s): Shinji Ejiri, Norikazu Yamada, Hiroshi Yoneyama
  • Journal Title: Proceedings of Science Volume: CPOD2014
  • Peer Reviewed / Open Access
• [Journal Article] Complex singularities around the QCD critical point at finite densities (2014)
  • Author(s): Shinji Ejiri, Yasuhiko Shinno, Hiroshi Yoneyama
  • Journal Title: Progress of Theoretical and Experimental Physics Volume: 2014 Issue: 8 Pages: 83B02-0
  • DOI: 10.1093/ptep/ptu108
  • Peer Reviewed / Open Access
• [Presentation] SU(3)格子ゲージ理論の一次相転移近傍での熱力学量の詳細な解析 (2018)
  • Author(s): 白銀瑞樹、江尻信司、石見涼、金谷和至、北沢正清、鈴木博、谷口祐介、梅田貴士、若林直輝
  • Organizer: 日本物理学会73回年次大会 (東京理科大学野田)
• [Presentation] 再重み付け法を用いたSU(3)ゲージ理論の重いクォーク領域における臨界質量 (2018)
  • Author(s): 板垣翔太,石見涼、梅田貴士、江尻信司、金谷和至、北沢正清、白銀瑞樹
  • Organizer: 日本物理学会73回年次大会 (東京理科大学野田)
• [Presentation] SU(3)格子ゲージ理論における相転移点での二相共存状態 (2017)
  • Author(s): 若林直輝, 江尻信司, 石見涼, 金谷和至, 北沢正清, 鈴木博, 谷口裕介, 梅田貴士, 白銀瑞樹
  • Organizer: 日本物理学会第72回年次大会
  • Place of Presentation: 大阪大学, 豊中キャンパス
  • Year and Date: 2017-03-17
• [Presentation] Gradient flowを用いたSU(3)ゲージ理論における相転移近傍の熱力学量の研究 (2017)
  • Author(s): 白銀瑞樹, 江尻信司, 石見涼, 金谷和至, 北沢正清, 鈴木博, 谷口裕介, 梅田貴士, 若林直輝
  • Organizer: 日本物理学会第72回年次大会
  • Place of Presentation: 大阪大学, 豊中キャンパス
  • Year and Date: 2017-03-17
• [Presentation] クロスオーバースケーリングを用いた有限温度・密度QCDの相構造 (2017)
  • Author(s): 石見涼, 江尻信司, 金谷和至, 大野浩史, 宇治敦史, 梅田貴士D, 吉田信介
  • Organizer: 日本物理学会第72回年次大会
  • Place of Presentation: 大阪大学, 豊中キャンパス
  • Year and Date: 2017-03-17
• [Presentation] Thermodynamics near the first order phase transition of SU(3) gauge theory using gradient flow (2017)
  • Author(s): Shinji Ejiri, Ryo Iwami, Kazuyuki Kanaya, Masakiyo Kitazawa, Yusuke Taniguchi, Hiroshi Suzuki, Mizuki Shirogane, Takashi Umeda, Naoki Wakabayashi
  • Organizer: Lattice 2017, International Symposium on Lattice Field Theory (Granada, Spain)
  • Int'l Joint Research
• [Presentation] 格子ゲージ理論による有限密度QCDの臨界点探索 (2017)
  • Author(s): 江尻信司
  • Organizer: 研究会「J-PARCエネルギー領域重イオン衝突のダイナミクス」 (高エネルギー加速器研究機構、東海キャンパス、茨城県東海村)
  • Invited
• [Presentation] Finite Density Lattice QCD (2017)
  • Author(s): Shinji Ejiri
  • Organizer: Reimei Workshop "Hadronic Resonances and Dense Nuclear Matter" (いばらき量子ビーム研究センター、茨城県東海村)
  • Int'l Joint Research / Invited
• [Presentation] gradient flowを用いてみる一次相転移点近傍の熱力学量の性質 (2017)
  • Author(s): 白銀瑞樹、江尻信司、石見涼、金谷和至、北沢正清、鈴木博、谷口祐介、梅田貴士、若林直輝
  • Organizer: 日本物理学会2017年秋季大会 (宇都宮大学)
• [Presentation] QCDの重いクォーク領域における臨界質量の格子間隔依存性 (2017)
  • Author(s): 板垣翔太、石見涼、梅田貴士、江尻信司、金谷和至,、北沢正清、白銀瑞樹
  • Organizer: 日本物理学会2017年秋季大会 (宇都宮大学)
• [Presentation] Critical line in finite temperature and density QCD by O(4) scaling analysis (2016)
  • Author(s): Ryo Iwami for WHOT-QCD Collaboration
  • Organizer: Japanese-German Seminar 2016, Phase structure of lattice field theories
  • Place of Presentation: 新潟大学, ときめいと
  • Year and Date: 2016-09-26
  • Int'l Joint Research
• [Presentation] gradient flowによるSU(3)ゲージ理論の1次相転移点付近での状態方程式 (2016)
  • Author(s): 白銀瑞樹, 江尻信司, 石見涼, 金谷和至, 北沢正清, 鈴木博, 谷口裕介, 梅田貴士, 若林直輝
  • Organizer: 日本物理学会2016年秋季大会
  • Place of Presentation: 宮崎大学
  • Year and Date: 2016-09-21
• [Presentation] 有限温度クエンチQCDにおける微分法による状態方程式の研究 (2016)
  • Author(s): 若林直輝, 谷口裕介, 石見涼, 梅田貴士, 江尻信司, 金谷和至, 北沢正清, 鈴木博
  • Organizer: 日本物理学会2016年秋季大会
  • Place of Presentation: 宮崎大学
  • Year and Date: 2016-09-21
• [Presentation] O(4)スケーリングを用いた有限温度・密度QCDの相転移線の曲率 (2016)
  • Author(s): 石見涼, 江尻信司, 金谷和至, 大野浩史, 宇治敦史, 梅田貴士, 若林直輝, 吉田信介
  • Organizer: 日本物理学会2016年秋季大会
  • Place of Presentation: 宮崎大学
  • Year and Date: 2016-09-21
• [Presentation] Determination of latent heat at the finite temperature phase transition of SU(3) gauge theory (2016)
  • Author(s): Shinji Ejiri, Ryo Iwami, Kazuyuki Kanaya, Masakiyo Kitazawa, Yusuke Taniguchi, Hiroshi Suzuki, Mizuki Shirogane, Takashi Umeda, Naoki Wakabayashi
  • Organizer: Lattice 2016, International Symposium on Lattice Field Theory
  • Place of Presentation: University of Southampton, Southampton, UK
  • Year and Date: 2016-07-24
  • Int'l Joint Research
• [Presentation] Phase structure of QCD at high temperature and high density by numerical simulations of lattice QCD (2016)
  • Author(s): Shinji Ejiri
  • Organizer: NIC-XIV School (School for Nuclei in the Cosmos XIV)
  • Place of Presentation: 新潟大学, ライブラリーホール
  • Year and Date: 2016-06-13
  • Int'l Joint Research / Invited
• [Presentation] O(4)スケーリングを用いた有限温度・密度QCDの相転移線 (2016)
  • Author(s): 石見涼, 江尻信司, 金谷和至, 大野浩史, 梅田貴士, 吉田信介
  • Organizer: 第71回日本物理学会年次大会
  • Place of Presentation: 東北学院大, 仙台市
  • Year and Date: 2016-03-19
• [Presentation] Quenched QCDの一次相転移点における潜熱と圧力ギャップ (2016)
  • Author(s): 白銀瑞樹, 江尻信司, 金谷和至, 北沢正清, 石見涼
  • Organizer: 第71回日本物理学会年次大会
  • Place of Presentation: 東北学院大, 仙台市
  • Year and Date: 2016-03-19
• [Presentation] Critical point search from an extended parameter space of lattice QCD at finite temperature and density (2015)
  • Author(s): Shinji Ejiri, Ryo Iwami, Norikazu Yamada, Hiroshi Yoneyama
  • Organizer: Quark Matter 2015, International Conference on Ultra Relativistic Nucleus
  • Place of Presentation: 神戸ファッションマート、神戸市
  • Year and Date: 2015-09-27
  • Int'l Joint Research
• [Presentation] Phase structure in an extended parameter space of lattice QCD at finite temperature and density (2015)
  • Author(s): Shinji Ejiri
  • Organizer: International workshop on QCD in extreme conditions
  • Place of Presentation: 華中師範大学, 武漢, 中国
  • Year and Date: 2015-09-21
  • Int'l Joint Research / Invited
• [Presentation] 再重みづけ法による高温高密度格子ＱＣＤ (2015)
  • Author(s): 江尻信司
  • Organizer: 研究会「有限温度密度系の物理と格子QCDシミュレーション」
  • Place of Presentation: 筑波大学 計算科学研究センター
  • Year and Date: 2015-09-05
  • Invited
• [Presentation] Many flavor approach to study the critical point in finite density QCD (2015)
  • Author(s): Ryo Iwami, Shinji Ejiri, Norikazu Yamada
  • Organizer: Lattice 2015, International Symposium on Lattice Field Theory
  • Place of Presentation: 神戸国際会議場, 神戸市
  • Year and Date: 2015-07-14
  • Int'l Joint Research
• [Presentation] First order transitions in finite temperature and density QCD with two and many flavors (2015)
  • Author(s): Shinji Ejiri
  • Organizer: Long-term workshop on “Hadrons and Hadron Interactions in QCD 2015” (HHIQCD2015)
  • Place of Presentation: 京都大学基礎物理学研究所、京都
  • Year and Date: 2015-03-16 – 2015-03-20
  • Invited
• [Presentation] First order transition regions in the quark masses and chemical potential parameter space of many-flavor QCD (2014)
  • Author(s): Shinji Ejiri, Norikazu Yamada, Hiroshi Yoneyama
  • Organizer: Critical Point and Onset of Deconfinement (CPOD 2014)
  • Place of Presentation: Bielefeld University, Bielefeld, Germany
  • Year and Date: 2014-11-17 – 2014-11-21
• [Presentation] 有限温度系 (2014)
  • Author(s): 江尻信司
  • Organizer: ＫＥＫ格子ゲージ理論スクール
  • Place of Presentation: 高エネルギー加速器研究機構、つくば市
  • Year and Date: 2014-11-10 – 2014-11-14
  • Invited
• [Presentation] Quark mass dependence of the nature of QCD phase transition at high temperature and density by a histogram method (2014)
  • Author(s): Shinji Ejiri
  • Organizer: Quark Confinement and the Hadron Spectrum XI
  • Place of Presentation: St. Petersburg, Russia
  • Year and Date: 2014-09-08 – 2014-09-12
  • Invited
• [Presentation] 多フレーバー格子ゲージ理論からの高温高密度ＱＣＤ相転移の研究 (2014)
  • Author(s): 江尻信司
  • Organizer: 理研シンポジウム・iTHES研究会「熱場の量子論とその応用」
  • Place of Presentation: 理化学研究所、和光市
  • Year and Date: 2014-09-03 – 2014-09-05
• [Presentation] 高温高密度格子ＱＣＤの最近の進展 (2014)
  • Author(s): 江尻信司
  • Organizer: 基研研究会「素粒子物理学の進展2014」
  • Place of Presentation: 京都大学基礎物理学研究所、京都
  • Year and Date: 2014-07-28 – 2014-08-01
  • Invited
• [Presentation] Quark mass dependence of finite temperature phase transitions in QCD with many flavors of Wilson fermions (2014)
  • Author(s): Shinji Ejiri, Norikazu Yamada
  • Organizer: International Symposium on Lattice Field Theory (Lattice 2014)
  • Place of Presentation: Columbia University, New York, USA
  • Year and Date: 2014-06-23 – 2014-06-28