RIKEN BNL Research Center, Special Postdoctoral Researcher

2011.4 - 2014.3

Technische Universität München, Visiting Scientist

2010.5 - 2011.3

Kyushu University, JSPS Research Fellowship for Young Scientist

2010.4 - 2011.3

Kyushu University, Research Fellowship for Young Scientists（DC2）

2009.4 - 2010.3

Application of the path optimization method to a discrete spin system Reviewed

Kouji Kashiwa, Yusuke Namekawa, Akira Ohnishi, Hayato Takase

Physical Review D   108   094504   2023.11

Instability of holographic cold compact stars with a color superconducting core Reviewed

Kazuo Ghoroku, Kouji Kashiwa, Yoshimasa Nakano, Motoi Tachibana, and Fumihiko Toyoda

Physical Review D   107   126007   2023.6

Some Aspects of Persistent Homology Analysis on Phase Transition: Examples in an Effective QCD Model with Heavy Quarks Reviewed

Hayato Antoku and Kouji Kashiwa

Universe   9   82   2023.2

Improving efficiency of the path optimization method for a gauge theory Reviewed

Yusuke Namekawa, Kouji Kashiwa, Hidefumi Matsuda, Akira Ohnishi, and Hayato Takase

Physical Review D   107   034509   2023.2

Exploration of Efficient Neural Network for Path Optimization Method

Y. Namekawa, K. Kashiwa, H. Matsuda, A. Ohnishi and H. Takase

The 39th International Symposium on Lattice Field Theory/Proceedings of Science   2022   026   2023

Persistent homology analysis for dense QCD effective model with heavy quarks Reviewed

Kouji Kashiwa, Takehiro Hirakida, Hiroaki Kouno

Symmetry   14 ( 9 )   1783   2022.8

Persistent homology analysis for QCD effective models

K. Kashiwa, T. Hirakida, H. Kouno

The 38th International Symposium on Lattice Field Theory/Proceedings of Science   346   2022.6

Multiplicity, probability, and canonical sectors for the cold QCD matter Reviewed

Kouji Kashiwa, Hiroaki Kouno

Physical Review D   105   054017   2022.3

Gauge invariant input to neural network for path optimization method Reviewed

Yusuke Namekawa, Kouji Kashiwa, Akira Ohnishi, Hayato Takase

Physical Review D   105   034502   2022.2

Equation of state for holographic nuclear matter as instanton gas

Kazuo Ghoroku, Kouji Kashiwa, Yoshimasa Nakano, Motoi Tachibana, Fumihiko Toyoda

A virtual tribute to Quark Confinement and the Hadron Spectrum/EPJ Web of Conferences   258   07005   2022.1

Stiff equation of state for a holographic nuclear matter as instanton gas Reviewed

Kazuo Ghoroku, Kouji Kashiwa, Yoshimasa Nakano, Motoi Tachibana, and Fumihiko Toyoda

Physical Review D   104   126002   2021.12

Investigation of the thermal QCD matter from canonical sectors Reviewed

Kouji Kashiwa

Symmetry   13 ( 7 )   1273   2021.7

Nonanalyticity, sign problem, and Polyakov line in a Z 3 -symmetric heavy quark model at low temperature: Phenomenological model analyses Reviewed

Hiroaki Kouno, Kouji Kashiwa, and Takehiro Hirakida

Physical Review D   104   014012   2021.7

Anatomy of the dense QCD matter from canonical sectors Reviewed

Kouji Kashiwa and Hiroaki Kouno

Physical Review D   103   114020   2021.6

Information theoretical view of QCD effective model with heavy quarks Reviewed

Kouji Kashiwa and Hiroaki Kouno

Physical Review D   103   014014   2021.1

Path optimization for U ( 1 ) gauge theory with complexified parameters Reviewed

Kouji Kashiwa, Yuto Mori

Physical Review D   102   054519   2020.9

The path optimization for the sign problem of low dimensional QCD

Y. Mori, K. Kashiwa and A. Ohnishi

The 37th International Symposium on Lattice Field Theory/Proceedings of Science   183   2020.8

Evading the model sign problem in the PNJL model with repulsive vector-type interaction via path optimization

A. Ohnishi, Y. Mori and K. Kashiwa

The 37th International Symposium on Lattice Field Theory/Proceedings of Science   213   2020.8

Extension to imaginary chemical potential in a holographic model Reviewed

Kazuo Ghoroku, Kouji Kashiwa, Yoshimasa Nakano, Motoi Tachibana, and Fumihiko Toyoda

Physical Review D   102   046003   2020.8

Persistent homology analysis of deconfinement transition in effective Polyakov-line model Reviewed

Takehiro Hirakida, Kouji Kashiwa, Junpei Sugano, Junichi Takahashi, Hiroaki Kouno, Masanobu Yahiro

International Journal of Modern Physics A   35 ( 10 )   2050049   2020.4

Path Optimization for the Sign Problem in Field Theories Using Neural Network

Akira Ohnishi, Yuto Mori, Kouji Kashiwa

8th International Conference on Quarks and Nuclear Physics (QNP2018)/JPS Conference Proceedings   26   024011   2019.11

Path optimization in 0+1 dimensional QCD at finite density Reviewed

Yuto Mori, Kouji Kashiwa, Akira Ohnishi

Progress of Theoretical and Experimental Physics   2019   113B01   2019.11

Roberge-Weiss periodicity, canonical sector, and modified Polyakov-loop Reviewed

Kouji Kashiwa, Hiroaki Kouno

Physical Review D   100   094023   2019.11

Phase transition encoded in neural network Reviewed

Kouji Kashiwa, Yuta Kikuchi, Akio Tomiya

Progress of Theoretical and Experimental Physics   2019   083A04   2019.8

Application of the path optimization method to the sign problem in an effective model of QCD with repulsive vector-type interactions Reviewed

Kouji Kashiwa, Yuto Mori, and Akira Ohnishi

Physical Review D   99   114005   2019.6

Path optimization method with use of neural network for the sign problem in field theories

Akira Ohnishi, Yuto Mori, Kouji Kashiwa

The 36th International Symposium on Lattice Field Theory/Proceedings of Science   023   2019.5

Color superconductivity in a holographic model Reviewed

Kazuo Ghoroku, Kouji Kashiwa, Yoshimasa Nakano, Motoi Tachibana, and Fumihiko Toyoda

Physical Review D   99   106011   2019.5

Imaginary Chemical Potential, NJL-Type Model and Confinement-Deconfinement Transition Reviewed

Kouji Kashiwa

Symmetry   11 ( 4 )   562   2019.4

Controlling the model sign problem via a path optimization method: Monte Carlo approach to a QCD effective model with Polyakov loop Reviewed

Kouji Kashiwa, Yuto Mori, and Akira Ohnishi

Physical Review D   99   014033   2019.1

Anomalous Hall effect in dense QCD matter Reviewed

Toshitaka Tatsumi, Ryo Yoshiike, Kouji Kashiwa

Physics Letters B   785 ( 10 )   46 - 50   2018.8

Lefschetz thimbles in fermionic effective models with repulsive vector-field Reviewed

Yuto Mori, Kouji Kashiwa, Akira Ohnishi

Physics Letters B   781   688   2018.6

Application of neural network to sign problem via path optimization method Reviewed

Yuto Mori, Kouji Kashiwa, Akira Ohnishi

Progress of Theoretical and Experimental Physics   2018 ( 2 )   023B04   2018.2

Toward solving the sign problem with path optimization method Reviewed

Yuto Mori, Kouji Kashiwa, Akira Ohnishi

Physical Review D   96 ( 11 )   111501   2017.11

Topological deconfinement transition in QCD at finite isospin density Reviewed

Kouji Kashiwa, Akira Ohnishi

Physics Letters B   772   669   2017.9

Three Baryon Interaction Generated by Determinant Interaction of Quarks Reviewed

Akira Ohnishi, Kouji Kashiwa, Kenji Morita

Progress of Theoretical and Experimental Physics   7   073D04   2017.7

Quark number holonomy and confinement-deconfinement transition Reviewed

Kouji Kashiwa, Akira Ohnishi

Physical Review D   93 ( 11 )   116002   2016.6

Test for a universal behavior of Dirac eigenvalues in the complex Langevin method Reviewed

Terukazu Ichihara, Keitaro Nagata, Kouji Kashiw

Physical Review D   93 ( 9 )   094511   2016.5

Understanding of QCD at high density from Z3-symmetric QCD-like theory Reviewed

Hiroaki Kouno, Kouji Kashiwa, Junichi Takahashi, Tatsuhiro. Misumi, Masanobu Yahiro

Physical Review D   93 ( 5 )   056009   2016.3

Phase structure of two-color QCD at real and imaginary chemical potentials; lattice simulations and model analyses Reviewed

Takahiro. Makiyama, Yuji Sakai, Takuya Saito, Masahiro Ishii, Junichi Takahashi, Kouji Kashiwa, Hiroaki Kouno, Aatsushi Nakamura, Masanobu Yahiro

Physical Review D   93 ( 1 )   014505   2016.1

Topological feature and phase transition of QCD at complex chemical potential Reviewed

Kouji Kashiwa, Akira Ohnishi

Physics Letters B   750   282   2015.9

Lee-Yang zero distribution of high temperature QCD and Roberge-Weiss phase transition Reviewed

Keitaro Nagata, Kouji Kashiwa, Atsushi Nakamura and Shinsuke M. Nishigaki

Physical Review D   91 ( 9 )   094507   2015.5

Evading the sign problem in the mean-field approximation through Lefschetz-thimble path integral Reviewed

Yuya Tanizaki, Hiromichi Nishimura and Kouji Kashiwa

Physical Review D   91 ( 10 )   101701(R)   2015.5

Phase structure of $SU(3)$ gauge-Higgs unification models at finite temperature Reviewed

Kouji Kashiwa, Yuya Tanizaki

Physical Review D   89 ( 11 )   116013   2014.6

Effective model approach to meson screening masses at finite temperature Reviewed

Masanori Ishii, Takahiro Sasaki, Kouji Kashiwa, Hiroaki Kouno, Masanobu Yahiro

Physical Review D   89 ( 7 )   071901(R)   2014.4

Quark contribution for center domain in heavy ion collisions Reviewed

Kouji Kashiwa, Akihiko Monnai

Physical Review D   89 ( 1 )   011501(R)   2014.1

Differences and similarities between fundamental and adjoint matters in SU(N) gauge theories Reviewed

Hiroaki Kouno, Yuji Sakai, Takahiro Sasaki, Kouji Kashiwa, Masanobu Yahiro

Physical Review D   88 ( 1 )   016002   2013.7

Polyakov loop and QCD thermodynamics from the gluon and ghost propagators Reviewed

Kenji Fukushima, Kouji Kashiwa

Physics Letter B   723 ( 4-5 )   360   2013.6

Phase structure and Hosotani mechanism in gauge theories with compact dimensions revisited Reviewed

Kouji Kashiwa, Tatsuhiro Misumi

The Journal of High Energy Physics   05   042   2013.5

Roberge-Weiss transition and 't Hooft loops Reviewed

Kouji Kashiwa, Robert D. Pisarski

Physical Review D   87 ( 9 )   096009   2013.5

Impact of Vector-Current Interactions on the QCD Phase Diagram Reviewed

Thomas Hell, Kouji Kashiwa, Wolfram Weise

Journal of Modern Physics   4 ( 5 )   644   2013.3

Two-color QCD at imaginary chemical potential and its impact on real chemical potential Reviewed

Kouji Kashiwa, Takahiro Sasaki, Hiroaki Kouno, Masanobu Yahiro

Physical Review D   87 ( 1 )   016015   2013.1

Critical endpoint for deconfinement in matrix and other effective models Reviewed

Kouji Kashiwa, Robert D. Pisarski, Vladimir V. Skokov

Physical Review D   85 ( 11 )   114029   2012.6

Nonlocal Polyakov–Nambu–Jona-Lasinio model and imaginary chemical potential Reviewed

Kouji Kashiwa, Thomas Hell, Wolfram Weise

Physical Review D   84 ( 5 )   056010   2011.9

Entanglement between chiral and deconfinement transitions under strong uniform magnetic background field Reviewed

Kouji Kashiwa

Physical Review D   83 ( 11 )   117901   2011.6

Extensions and further applications of the nonlocal Polyakov--Nambu--Jona-Lasinio model Reviewed

Thomas Hell, Kouji Kashiwa, Wolfram Weise

Physical Review D   83 ( 11 )   114008   2011.6

Violations of parity and charge conjugation in the theta vacuum with imaginary chemical potential Reviewed

Hiroaki Kouno, Yuji Sakai, Takahiro Sasaki, Kouji Kashiwa, Masanobu Yahiro

Physical Review D   83 ( 7 )   076009   2011.4

Investigation of meson masses for real and imaginary chemical potential using the three-flavor PNJL model Reviewed

Takeshi Matsumoto, Kouji Kashiwa, Hiroaki Kouno, Kagayaki Oda, Masanobu Yahiro

Physics Letter B   694 ( 4-5 )   367   2011.1

Dual quark condensate in the Polyakov-loop extended Nambu—Jona-Lasinio model Reviewed

Kouji Kashiwa, Hiroaki Kouno, Masanobu Yahiro

Physical Review D   80 ( 11 )   117901   2009.12

The Roberge-Weiss phase transition and its endpoint Reviewed

Hiroaki Kouno, Yuji Sakai, Kouji Kashiwa, Masanobu Yahiro

Journal of Physics G: Nuclear and Particle Physics   36 ( 11 )   115010   2009.10

Correlations among discontinuities in the QCD phase diagram Reviewed

Kouji Kashiwa, Masanobu Yahiro, Hiroaki Kouno, Masayuki Matsuzaki, Yuji Sakai

Journal of Physics G: Nuclear and Particle Physics   36 ( 10 )   105001   2009.8

Determination of QCD phase diagram from the imaginary chemical potential region Reviewed

Yuji Sakai, Kouji Kashiwa, Hiroaki Kouno, Masayuki Matsuzaki, Masanobu Yahiro

Physical Review D   79 ( 9 )   096001   2009.5

Meson mass at real and imaginary chemical potentials Reviewed

Kouji Kashiwa, Masayuki Matsuzaki, Hiroaki Kouno, Yuji Sakai, Masanobu Yahiro

Physical Review D   79 ( 7 )   076008   2009.4

Lepton effects on the protoneutron stars with the hadron-quark mixed phase in the Nambu–Jona-Lasinio model Reviewed

Nobutoshi Yasutake and Kouji Kashiwa

Physical Review D   79 ( 4 )   043012   2009.2

Vector-type four-quark interaction and its impact on QCD phase structure Reviewed

Yuji Sakai, Kouji Kashiwa, Hiroaki Kouno, Masayuki Matsuzaki, Masanobu Yahiro

Physical Review D   78 ( 7 )   076007   2008.10

Phase diagram in the imaginary chemical potential region and extended Z3 symmetry Reviewed

Yuji Sakai, Kouji Kashiwa, Hiroaki Kouno and Masanobu Yahiro

Physical Review D   78 ( 3 )   036001   2008.8

Critical endpoint in the Polyakov-loop extended NJL model Reviewed

Kouji Kashiwa, Hiroaki Kouno, Masayuki Matsuzaki and Masanobu Yahiro

Physics Letters B   662 ( 1 )   26   2008.4

Polyakov loop extended Nambu–Jona-Lasinio model with imaginary chemical potential Reviewed

Yuji Sakai, Kouji Kashiwa, Hiroaki Kouno and Masanobu Yahiro

Physical Review D   77 ( 5 )   051901(R)   2008.3

Meson loop effect on high density chiral phase transition Reviewed

Tomohiko Sakaguchi, Kouji Kashiwa, Masayuki Matsuzaki, Hiroaki Kouno, Masanobu Yahiro

Central European Journal of Physics   6 ( 1 )   116   2008.2

Effects of a multi-quark interaction on color superconducting phase transition in an extended NJL model Reviewed

Kouji Kashiwa, Masayuki Matsuzaki, Hiroaki Kouno and Masanobu Yahiro

Physics Letters B   657 ( 1-3 )   143   2007.11

Chiral phase transition in an extended NJL model with higher-order multi-quark interactions Reviewed

Kouji Kashiwa, Hiroaki Kouno, Tomohiko Sakaguchi, Masayuki Matsuzaki, Masanobu Yahiro

Physics Letters B   647 ( 5-6 )   446   2007.4

虚数化学ポテンシャル領域における QCD 有効模型の孔構造の分布の広がりについての研究　（指導院生による発表）

安徳勇知 , 柏浩司

第129回日本物理学会九州支部例会 

あるポスドクから見た大西さん

熱場の量子論とその応用、追悼セッション「大西明さんを偲んで」、講演  2023.8 

QCD相構造の研究における機械学習とトポロジカルデータ解析の応用

筑波大学 素粒子理論セミナー、講演  2023.1 

虚数化学ポテンシャル領域における QCD 有効模型のパーシステ ントホモロジー解析　（指導院生による発表）

安徳勇知、柏浩司

第128回日本物理学会九州支部例会 

Application of the persistent homology analysis to QCD phase structure

Saga-Yonsei Partnership program XVIII、講師  2022.1 

カノニカル法を利用した有限密度QCD物質の研究

柏浩司、河野宏明

第127回日本物理学会九州支部例会 

Exploring the QCD phase diagram ～non-mainstream approaches～

名古屋大学クォーク・ハドロン理論研究室（H研）主催　H研夏の学校、講師  2021.9 

Exploring the Phase Structure of QCD Effective Models with Persistent homology International conference

Kouji Kashiwa

SIAM Conference on Applied Algebraic Geometry (AG21)  

カノニカル法に基づいたQCD相構造の研究

柏　浩司、河野宏明

日本物理学会 2021年秋季大会 

Persistent homology analysis for QCD effective models International conference

Kouji Kashiwa, Hiroaki Kouno, Takenori Hirakida

The 38th International Symposium on Lattice Field Theory 

Exploring the QCD phase diagram with holographic models （招待講演）

Kouji Kashiwa

KEK Theory Workshop 2020 

カノニカル法における Polyakov-loop paradox の研究

柏浩司、河野宏明

日本物理学会第75回年次大会 

QCD相構造研究における機械学習の利用

日本物理学会四国支部学術講演会、講師  2019.12 

Toward solving the sign problem in dense QCD matter with the machine learning technique

The 16th Yonsei-Saga partnership program 2019、講師  2019.12 

Uhlmann位相を利用した非閉じ込め相転移の研究

柏浩司、河野宏明

第125回日本物理学会九州支部例会 

Toward solving the sign problem in dense QCD matter via the path optimization method　（招待講演） International conference

Kouji Kashiwa, Yuto Mori, Akira Ohnishi

Quarks and Compact Stars (QCS 2019) 

経路最適化法を用いたQCD有効模型における符号問題の研究

柏浩司、森勇登、大西明

日本物理学会 第74回年次大会 

トポロジカルな観点からの非閉じ込め相転移の研究

柏浩司、土居孝寛

第124回日本物理学会九州支部例会 

Toward solving the sign problem with machine learning　（招待講演）

柏　浩司

Deep Learning and physics 2018 (DLAP2018) 

2023   Graduation Study

2023   Special Lecture of Applied Physics I

2023   Research Study for Master's Thesis in

2022   Physics I

2022   Elementary Physics

2022   Seminar on Fundamentals of Computer

2022   Physics II

2022   Information Physics

2022   Special Lectures in Computer Science and

2022   Graduation Study

2022   Special Lecture of Applied Physics I

2021   Elementary Physics

2021   Seminar on Fundamentals of Computer

2021   Elementary Electromagnetics

2021   Physics I

2021   Information Physics

2021   Physics II

2021   Special Lectures in Computer Science and

2021   Graduation Study

2021   Special Lecture of Applied Physics I

2020   Seminar on Fundamentals of Computer

2020   Physics I

2020   Elementary Electromagnetics

2020   Elementary Physics

2020   Information Physics

2020   Physics II

2020   Special Lectures in Computer Science and

2020   Graduation Study

2020   Special Lecture of Applied Physics I

2019   Elementary Physics

2019   Seminar on Fundamentals of Computer

2019   Elementary Electromagnetics

2019   Physics I

2019   Information Physics

2019   Physics II

2019   Special Lectures in Computer Science and

2019   Graduation Study

2019   Special Lecture of Applied Physics I

2018   Elementary Physics

2018   Seminar on Fundamentals of Computer

2018   Physics I

2018   Elementary Electromagnetics

2018   Information Physics

2018   Physics II

2018   Special Lectures in Computer Science and

2018   Special Lecture of Applied Physics I

「物理屋のための機械学習講義」世話人

Role(s)： Organizing member

2022

「計算物理 春の学校 2023」世話人

Role(s)： Organizing member

2022

基研研究会「熱場の量子論とその応用」世話人

Role(s)： Organizing member

2022

高エネルギー加速器研究機構・研究会 「熱場の量子論とその応用」世話人

Role(s)： Organizing member

2021

高エネルギー加速器研究機構・研究会 「熱場の量子論とその応用」世話人

Role(s)： Organizing member

2020

「Deep Learning and Physics 2019」世話人

Role(s)： Organizing member

2019

基研研究会「熱場の量子論とその応用」世話人

Role(s)： Organizing member

2019

理研シンポジウム・iTHEMS研究会「熱場の量子論とその応用」世話人

Role(s)： Organizing member

2018

New Frontiers in QCD 2018、世話人

Role(s)： Organizing member

2018

基研研究会 「熱場の量子論とその応用」世話人

Role(s)： Organizing member

2017

九大若手研究会「量子色力学の相構造研究の現状と展望」世話人

Role(s)： Organizing member

2008