Updated on 2025/09/01

写真a

 
NISHIMURA Kentaro
 
Organization
Academic Assembly Institute of Science and Technology Specially Appointed Assistant Professor
Faculty of Science Specially Appointed Assistant Professor
Title
Specially Appointed Assistant Professor
External link

Degree

  • 博士（理学） ( 2022.3   慶應義塾大学 )

Research Areas

  • Natural Science / Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics

Research History (researchmap)

  • Niigata University   Institute of Science and Technology   JSPS, Research Fellowships for Young Scientists (PD)

    2025.4

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  • Hiroshima University   International Institute for Sustainability with Knotted Chiral Meta Matter/WPI-SKCM2   Researcher

    2023.12 - 2025.3

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  • High Energy Accelerator Research Organization   Institute of Particle and Nuclear Studies

    2022.4 - 2023.11

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  • Keio University   Graduate School of Science and Technology

    2019.4 - 2022.3

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Research History

  • Niigata University   Faculty of Science   Specially Appointed Assistant Professor

    2025.4

  • Niigata University   Institute of Science and Technology, Academic Assembly   Specially Appointed Assistant Professor

    2025.4

Education

  • Keio University   Graduate School of Science and Technology   基礎理工学専攻 物理学専修

    2017.4 - 2022.3

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  • Keio University   Faculty of Science and Technology   Department of Physics

    2013.4 - 2017.3

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Professional Memberships

 

Papers

  • Domain-Wall Skyrmion Phase in Dense QCD at Strong Magnetic Fields Using Leading-Order Chiral Perturbation Theory

    MINORU ETO, Kentaro Nishimura, Muneto Nitta

    Phys.Rev.Lett.   134 ( 18 )   181902 - 181902   2025.5

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevLett.134.181902

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  • Inhomogeneous entanglement structure in monoaxial chiral ferromagnetic quantum spin chain

    Kentaro Nishimura, Ryosuke Yoshii

    2025.4

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    Chiral magnets, characterized by inhomogeneous magnetic moment arrangements,
    have attracted significant attention recently due to their topological orders,
    such as magnetic skyrmion lattices and chiral soliton lattices. In this work,
    we investigate the entanglement entropy of \textit{quantum} chiral magnets and
    demonstrate that it reflects the inhomogeneous nature of the ground state. We
    perform numerical simulations of a one-dimensional monoaxial chiral
    ferromagnetic chain with Zeeman term using the density matrix renormalization
    group method. Our results show that the entanglement entropy exhibits
    oscillatory behavior, which can be tuned by varying the external magnetic
    field. Analysis of the local magnetization and spin chirality further confirms
    that these oscillations correspond to solitonic structures. Moreover, our
    findings suggest that the entanglement entropy can serve as a probe for
    detecting the vacuum structure, providing new insights into quantum
    correlations.

    arXiv

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    Other Link： http://arxiv.org/pdf/2504.08273v1

  • Quantum Hall liquids in high-density QCD

    Kentaro Nishimura, Naoki Yamamoto, Ryo Yokokura

    PHYSICAL REVIEW D   111 ( 5 )   2024.10

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevD.111.054010

    Web of Science

    arXiv

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    Other Link： http://arxiv.org/pdf/2410.07665v1

  • Dense QCD<inf>2</inf> with matrix product states

    Tomoya Hayata, Yoshimasa Hidaka, Kentaro Nishimura

    Journal of High Energy Physics   2024 ( 7 )   2024.7

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1007/JHEP07(2024)106

    Scopus

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  • Non-Abelian chiral soliton lattice in rotating QCD matter: Nambu-Goldstone and excited modes

    Minoru Eto, Kentaro Nishimura, Muneto Nitta

    Journal of High Energy Physics   2024 ( 3 )   2024.3

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1007/JHEP03(2024)035

    Scopus

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  • Domain-wall Skyrmion phase in a rapidly rotating QCD matter

    Minoru Eto, Kentaro Nishimura, Muneto Nitta

    Journal of High Energy Physics   2024 ( 3 )   2024.3

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1007/JHEP03(2024)019

    Scopus

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  • Novel transition dynamics of topological solitons

    Kentaro Nishimura, Noriyuki Sogabe

    Physical Review D   109 ( 1 )   2024.1

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevD.109.014028

    Scopus

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  • Phase diagram of QCD matter with magnetic field: domain-wall Skyrmion chain in chiral soliton lattice

    Minoru Eto, Kentaro Nishimura, Muneto Nitta

    Journal of High Energy Physics   2023 ( 12 )   2023.12

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1007/JHEP12(2023)032

    Scopus

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  • How baryons appear in low-energy QCD: Domain-wall Skyrmion phase in strong magnetic fields

    Eto, Minoru, Nishimura, Kentaro, Nitta, Muneto

    2023.4

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    Publishing type：Research paper (scientific journal)  

    Low-energy dynamics of QCD can be described by pion degrees of freedom in
    terms of the chiral perturbation theory(ChPT). A chiral soliton lattice(CSL),
    an array of solitons, is the ground state due to the chiral anomaly in the
    presence of a magnetic field larger than a certain critical value at finite
    density. Here, we show in a model-independent and fully analytic manner (at the
    leading order of ChPT) that the CSL phase transits to a {\it domain-wall
    Skyrmion phase} when the chemical potential is larger than the critical value
    $\mu_{\rm c} = 16\pi f_{\pi}^2/3m_{\pi} \sim 1.03 \;\; {\rm GeV}$ with the
    pion's decay constant $f_{\pi}$ and mass $m_{\pi}$, which can be regarded as
    the nuclear saturation density. There spontaneously appear stable
    two-dimensional Skyrmions or lumps on a soliton surface, which can be viewed as
    three-dimensional Skyrmions carrying even baryon numbers from the bulk despite
    no Skyrme term. They behave as superconducting rings with persistent currents
    due to a charged pion condensation, and areas of the rings' interiors are
    quantized. This phase is in scope of future heavy-ion collider experiments.

    arXiv

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    Other Link： http://arxiv.org/pdf/2304.02940v1

  • Formation of a chiral soliton lattice

    Tetsutaro Higaki, Kohei Kamada, Kentaro Nishimura

    Physical Review D   106 ( 9 )   2022.11

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevD.106.096022

    Scopus

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  • Phases of rotating baryonic matter: non-Abelian chiral soliton lattices, antiferro-isospin chains, and ferri/ferromagnetic magnetization

    Minoru Eto, Kentaro Nishimura, Muneto Nitta

    Journal of High Energy Physics   2022 ( 8 )   2022.8

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1007/JHEP08(2022)305

    Scopus

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  • Topological term, QCD anomaly, and the η′ chiral soliton lattice in rotating baryonic matter

    Kentaro Nishimura, Naoki Yamamoto

    Journal of High Energy Physics   2020 ( 7 )   2020.7

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1007/JHEP07(2020)196

    Scopus

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  • Anomaly-Induced Effects of Rotating Dense Matter

    Xu-Guang Huang, Kentaro Nishimura, Naoki Yamamoto

    Proceedings of the 8th International Conference on Quarks and Nuclear Physics (QNP2018)   2019.11

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    Publishing type：Research paper (international conference proceedings)   Publisher：Journal of the Physical Society of Japan  

    DOI： 10.7566/jpscp.26.031020

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  • Anomalous effects of dense matter under rotation

    Xu Guang Huang, Kentaro Nishimura, Naoki Yamamoto

    Journal of High Energy Physics   2018 ( 2 )   2018.2

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1007/JHEP02(2018)069

    Scopus

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Presentations

  • Exploring Dense QCD through Hamiltonian Lattice Simulations in (1+1) Dimensions Invited

    Kentaro Nishimura

    Tensor Network 2025  2025.7 

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    Event date： 2025.7

    Language：Japanese   Presentation type：Oral presentation (invited, special)  

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  • Phase diagram of QCD matter with magnetic field: domain-wall Skyrmion chain in chiral soliton lattice

    Kentaro Nishimura

    Topology and Dynamics of Magneto-Vortical Matter  2025.1 

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    Event date： 2025.1

    Presentation type：Oral presentation (general)  

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  • Phase diagram of QCD matter with magnetic field: domain-wall Skyrmion chain in chiral soliton lattice Invited

    Kentaro Nishimura

    Symmetry and Effective Field Theory of Quantum Matter  2024.11 

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    Event date： 2024.11

    Presentation type：Oral presentation (invited, special)  

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  • Phase diagram of QCD matter with magnetic field: domain-wall Skyrmion chain in chiral soliton lattice

    Kentaro Nishimura

    Compact stars in the QCD phase diagram  2024.10 

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    Presentation type：Oral presentation (general)  

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  • Numerical calculation of dense QCD in 1+1 dimension with Hamiltonian formalism

    2024.9 

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    Presentation type：Oral presentation (general)  

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  • Phase diagram of QCD matter with magnetic field: domain-wall Skyrmion chain in chiral soliton lattice

    Kentaro Nishimura

    QCHSC2024 (The XVIth Quark Confinement and the Hadron Spectrum Conference)  2024.8 

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    Presentation type：Oral presentation (invited, special)  

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  • Exploring Dense QCD through Hamiltonian Lattice Simulations in (1 + 1) Dimen- sions

    Kentaro Nishimura

    XQCD2024 (The 20th international conference on QCD in extreme conditions)  2024.7 

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    Presentation type：Oral presentation (general)  

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  • Phase diagram of QCD matter with magnetic field: domain-wall Skyrmion chain in chiral soliton lattice

    Kentaro Nishimura

    2024.3 

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    Presentation type：Oral presentation (general)  

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  • Non-Abelian chiral soliton lattice in rotating QCD matter: Nambu-Goldstone and excited modes

    Kentaro Nishimura

    Condensed Matter Physics of QCD 2024  2024.3 

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    Presentation type：Oral presentation (invited, special)  

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  • How baryons appear in low-energy QCD: Domain-wall Skyrmion phase in strong mag- netic fields

    Kentaro Nishimura

    Setouchi Summer Institute (SSI)  2023.9 

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    Presentation type：Oral presentation (general)  

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  • Topological second-order phase transition in dense QCD under a magnetic field

    Kentaro Nishimura

    Thermal Quantum Field Theory and Their Applications 2023  2023.8 

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    Presentation type：Oral presentation (general)  

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  • How baryons appear in low-energy QCD: Domain-wall Skyrmion phase in strong mag- netic fields

    Kentaro Nishimura

    XQCD2023 (The 19th international conference on QCD in extreme conditions)  2023.7 

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    Presentation type：Oral presentation (general)  

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  • Nambu-Goldstone modes in non-Abelian chiral soliton lattices

    Kentaro Nishimura

    Spring Meeting of Physical Society of Japan 2023  2023.3 

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    Presentation type：Oral presentation (general)  

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  • Numerical analysis of 1+1 dimensional dense QCD with the Hamiltonian formalism

    Kentaro Nishimura

    Spring Meeting of Physical Society of Japan 2023  2023.3 

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    Presentation type：Oral presentation (general)  

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  • Phases of rotating baryonic matter: non-Abelian chiral soliton lattices, antiferro- isospin chains, and ferri/ferromagnetic magnetization

    Kentaro Nishimura

    Thermal Quantum Field Theory and Their Applications 2022  2022.9 

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    Presentation type：Oral presentation (general)  

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  • Instability of the gravitational field in chiral matters

    Kentaro Nishimura

    Thermal Quantum Field Theory and Their Applications 2021  2021.8 

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    Presentation type：Poster presentation  

    researchmap

  • Topological term, QCD anomaly, and eta' chiral soliton lattice in rotating baryonic matter

    Kentaro Nishimura

    KEK theory workshop  2020.12 

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    Presentation type：Oral presentation (general)  

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  • 回転するバリオン物質におけるトポロジカル項、QCD anomalyとη’カイラルソリトン格子 Invited

    西村健太郎

    KEK理論センター研究会「熱場の量子論とその応用」  2020.8 

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    Presentation type：Oral presentation (invited, special)  

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  • Inhomogeneous eta’ condensation in rotating baryonic matter

    Kentaro Nishimura

    Quantum kinetic theories in magnetic and vortical fields  2019.12 

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    Presentation type：Oral presentation (general)  

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  • Chiral soliton lattice in dense matter under rotation

    Kentaro Nishimura

    Quantum systems in extreme conditions  2019.9 

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    Presentation type：Poster presentation  

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  • 回転するバリオン物質における非一様η’凝縮相

    西村健太郎

    日本物理学会2019年秋季大会  2019.9 

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    Presentation type：Oral presentation (general)  

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  • 回転するバリオン物質におけるη’中間子のカイラルソリトン格子状態

    西村健太郎

    KEK理論センター研究会「熱場の量子論とその応用」  2019.9 

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    Presentation type：Poster presentation  

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  • Chiral soliton lattice in dense matter under rotation

    Kentaro Nishimura

    XQCD2019 (The 17th international conference on QCD in extreme conditions)  2019.6 

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    Presentation type：Poster presentation  

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  • Chiral soliton lattice in rotating and dense matter

    Kentaro Nishimura

    8th International Conference on Quarks and Nuclear Physics  2018.11 

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    Presentation type：Poster presentation  

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  • Chiral soliton lattice in dense matter under rotation

    Kentaro Nishimura

    Quark Matter 2019 - the XXVIIIth International Conference on Ultra-relativistic Nucleus-Nucleus Collisions  2018.11 

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    Presentation type：Poster presentation  

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  • 回転する高密度バリオン物質におけるカイラルソリトン格子

    西村健太郎

    KEK理論センター研究会「熱場の量子論とその応用」  2018.8 

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    Presentation type：Poster presentation  

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  • Anomalous effects of dense matter under rotation

    Kentaro Nishimura

    Avenues of quantum field theory in curved spacetime  2018.7 

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    Presentation type：Oral presentation (general)  

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  • 回転する高密度バリオン物質におけるカイラルソリトン格子

    西村健太郎

    日本物理学会年次大会  2018.3 

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    Presentation type：Oral presentation (general)  

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Research Projects

  • QCDにおける非一様相の第一原理計算による検証とトポロジカルな二次相転移

    Grant number：25K17392

    2025.4 - 2028.3

    System name：科学研究費助成事業

    Research category：若手研究

    Awarding organization：日本学術振興会

    西村 健太郎

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    Grant amount：\4290000 （ Direct Cost: \3300000 、 Indirect Cost：\990000 ）

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  • 磁場中の有限密度QCDにおけるトポロジカルな二次相転移

    Grant number：25KJ0148

    2025.4 - 2028.3

    System name：科学研究費助成事業

    Research category：特別研究員奨励費

    Awarding organization：日本学術振興会

    西村 健太郎

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    Grant amount：\3510000 （ Direct Cost: \2700000 、 Indirect Cost：\810000 ）

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  • 回転するQCD物質と物性系におけるトポロジカル輸送現象と相構造の普遍性

    Grant number：19J21593

    2019.4 - 2022.3

    System name：科学研究費助成事業

    Research category：特別研究員奨励費

    Awarding organization：日本学術振興会

    西村 健太郎

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    Grant amount：\2500000 （ Direct Cost: \2500000 ）

    本年度はカイラル物質の電磁場への応答であるカイラル磁気効果や異常ホール効果を統一的に記述するトポロジカルな場の理論であるアクシオン項をトーションの存在する系への一般化を目指した。その際にカイラル運動論を用いたが外場に対して一次までの輸送しか記述できず、考えていた輸送現象は二次応答なので直接適用することが不可能であった。二次応答を記述するためには、外場に対してウィグナー関数を通常一次まで計算しているところを二次まで求める必要があった。
    回転する3フレーバーのバリオン物質の基底状態に関して、昨年度の論文JHEP07(2020)196でη’中間子のカイラルソリトン格子（CSL）状態になることを示したが、実はπ中間子を考慮することで新奇な基底状態になることを発見した。今回の解析では簡単のために２フレーバーを考え、軸性変換方向の中間子であるη中間子とπ中間子の両方を考慮した低エネルギー有効理論を用いた。その結果、η中間子とπ中間子の崩壊定数の差により、先行研究で考えたηCSL格子状態はπ中間子の揺らぎに対して不安定であることを示した。実現される基底状態は、回転軸の方向にアイソスピンの自由度をもつソリトンが反強磁性的に並んだ状態である。この状態はπ中間子部分が重要であることから非可換CSL格子状態と呼ぶことにした。更に非可換CSL状態はソリトンがダイマーを形成したダイマー相と完全に分離している非閉じ込め相に分類でき、ダイマー相は非閉じ込め相、従来知られていたηCSLとQCD真空三つの相と接しており、三重臨界点が存在することを発見した。励起状態もηCSLとは異なり、並進対称性の自発的破れに伴うフォノンと、アイソスピン対称性の自発的な破れに伴う別のギャップレスモードが生じる。更にη,π中間子に関するトポロジカル項によって非可換CSL状態はフェリ磁性、ηCSLはフェロ磁性になることを示した。

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