KEIO RESEARCHERS INFORMATION SYSTEM

Career 【 Display / hide 】

Career 【 Display / hide 】

• 2007.04

  -

  2010.03

  東京大学, 大学院理学系研究科, 日本学術振興会 特別研究員 (DC1)

• 2010.04

  -

  2012.03

  University of Washington, Institute for Nuclear Theory, JSPS Postdoctoral Fellow for Research Abroad / Research Associate

• 2012.04

  -

  2013.08

  京都大学, 基礎物理学研究所, 日本学術振興会 特別研究員 (PD)

• 2013.09

  -

  2014.03

  University of Maryland, Maryland Center for Fundamental Physics, Research Associate

• 2014.04

  -

  2017.03

  慶應義塾大学, 理工学部物理学科, 専任講師

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Academic Background 【 Display / hide 】

Academic Background 【 Display / hide 】

• 2001.04

  -

  2005.03

  The University of Tokyo, 理学部, Department of Physics

  University, Graduated

• 2005.04

  -

  2007.03

  The University of Tokyo, Faculty of Science, Department of Physics

  Graduate School, Completed, Master's course

• 2007.04

  -

  2010.03

  The University of Tokyo, Faculty of Science, Department of Physics

  Graduate School, Completed, Doctoral course

Academic Degrees 【 Display / hide 】

Academic Degrees 【 Display / hide 】

• 博士（理学）, The University of Tokyo, Coursework, 2010.03

Research Areas 【 Display / hide 】

Research Areas 【 Display / hide 】

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

Books 【 Display / hide 】

Books 【 Display / hide 】

• Crossover Between Quark Nuclear Matter and Condensed-Matter Physics

  Tomáš Brauner, Naoki Yamamoto, Springer, 2023.01

  　View Summary

  We review quantum many-body phenomena in nuclear and quark matter which share similarities or universalities with condensed-matter physics. The focus is on the quantum phases of quark nuclear matter and topological transport phenomena due to the Berry phase of quark matter. The former includes nuclear superfluidity/superconductivity via the Bardeen–Cooper–Schrieffer (BCS) mechanism, Bose–Einstein condensation (BEC) of mesons, color superconductivity of quarks, BCS–BEC crossover phenomena and quark–hadron continuity, chiral soliton lattice of mesons, and the application of the notions of topological order and higher-form symmetry. The latter includes the so-called chiral magnetic effect and related phenomena. Their potential phenomenological implications as well as the close connections with a number of condensed-matter systems are also discussed.

  • Access to Document (DOI)

Papers 【 Display / hide 】

Papers 【 Display / hide 】

• Vorticity-induced effects from Wess-Zumino-Witten terms

  Geraint W. Evans, Naoki Yamamoto, Di-Lun Yang

  Physical Review D (American Physical Society)  113 ( 4 ) 036029(1-10) 2026.02

  Research paper (scientific journal), Joint Work, Accepted

  • Access to Document (DOI)

• Self-Similar Inverse Cascade from Generalized Symmetries

  Yuji Hirono, Kohei Kamada, Naoki Yamamoto, Ryo Yokokura

  Physical Review Letters (American Physical Society)  136 ( 6 ) 061604(1-6) 2026.02

  Research paper (scientific journal), Joint Work, Accepted,  ISSN  00319007

  　View Summary

  We investigate the role of generalized symmetries in driving nonequilibrium and nonlinear phenomena, specifically focusing on turbulent systems. While conventional turbulence studies have revealed inverse cascades driven by conserved quantities integrated over the entire space, such as helicity in three spatial dimensions, the influence of higher-form symmetries, whose conserved charges are defined by integration over subspaces, remains largely unexplored. We demonstrate a novel mechanism where higher-form symmetries naturally induce a self-similar inverse cascade. Taking axion electrodynamics with nonlinear topological interaction as a paradigmatic example, we show that the conserved charge associated with its 1-form symmetry drives the system toward large-scale coherent structures through a universal scaling behavior characterized by analytically determined scaling exponents. Our findings suggest that higher-form symmetries can provide a fundamental organizing principle for understanding nonequilibrium phenomena and the emergence of coherent structures in turbulent systems.

  • Access to Document (DOI)

• Scaling behaviors in active model B+ via the functional renormalization group

  Gergely Fejős, Zsolt Szép, Naoki Yamamoto

  Physical Review E (American Physical Society)  113 ( 1 ) 014130(1-15) 2026.01

  Research paper (scientific journal), Joint Work, Accepted,  ISSN  24700045

  　View Summary

  We study the scaling behaviors of the active model B+ using the functional renormalization group (FRG) approach based on the nonequilibrium effective action formulated via the Martin-Siggia-Rose path-integral formalism. We derive the β functions for all couplings of the system in generic d dimensions, revealing regulator independence in various contributions to the renormalization group (RG) flow at specific values for d. After identifying specific regions of the parameter space that define submodels closed under RG transformations, we determine all fixed points of potential physical relevance. We confirm the existence of a bicritical fixed point, which was conjectured within the perturbative momentum-shell RG method for being responsible for the transition from bulk phase separation to microphase separation in active systems. We argue that, within the FRG approach, global flows significantly differ from those obtained in its perturbative counterpart.

  • Access to Document (DOI)

• Quantum Hall liquids in high-density QCD

  Kentaro Nishimura, Naoki Yamamoto, Ryo Yokokura

  Physical Review D 111 ( 5 ) 054010(1-7) 2025.03

  Research paper (scientific journal), Joint Work, Accepted,  ISSN  24700010

  　View Summary

  There exist metastable domain walls of the flavor-singlet meson η for the U(1) axial symmetry in two-flavor color superconductivity (2SC) in quantum chromodynamics (QCD) at large baryon density. We show that, due to the coupling of η to confined SU(2) gluons in the 2SC phase, the effective theory on the domain wall is described by the SU(2)-1 Chern-Simons theory, which is dual to the U(1)2 Chern-Simons theory. This theory has a spin-1 droplet excitation that does not carry a baryon number, which we identify as a vector meson. We also discuss the effective theories and baryonic droplet excitations on the domain walls of the flavor-singlet mesons in the superfluid phases of QCD at large isospin density and two-color QCD at large baryon density.

  • Access to Document (DOI)

• Chiral kinetic theory with self-energy corrections and neutrino spin Hall effect

  Naoki Yamamoto, Di-Lun Yang

  Physical Review D 109 ( 5 ) 056010(1-14) 2024.03

  Research paper (scientific journal), Joint Work, Accepted,  ISSN  24700010

  　View Summary

  We systematically derive the chiral kinetic theory for chiral fermions with collisions, including the self-energy corrections, from quantum field theories. We find that the Wigner functions and chiral kinetic equations receive both the classical and quantum corrections from the self-energies and their spacetime gradients. We also apply this formalism to study nonequilibrium neutrino transport due to the interaction with thermalized electrons and nucleons, as realized in core-collapse supernovae. We derive neutrino currents along magnetic fields and neutrino spin Hall effect induced by the density gradient at first order in the Fermi constant GF for anisotropic neutrino distributions.

  • Access to Document (DOI)

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Papers, etc., Registered in KOARA 【 Display / hide 】

Papers, etc., Registered in KOARA 【 Display / hide 】

• "Homework" from childhood

  Yamamoto, Naoki

  New Kyurizukai (Faculty of Science and Technology, Keio University)   ( 32 )  2020.02

• 子供の頃からの「宿題」

  Yamamoto, Naoki

  新版 窮理図解 (慶應義塾大学理工学部)   ( 32 )  2020.02

• New physics of supernovae and the early universe due to chiral transport phenomena

  Yamamoto, Naoki

  科学研究費補助金研究成果報告書 2018

• New physics of supernova explosions and the early Universe explored from gravitational waves

  Yamamoto, Naoki

  学事振興資金研究成果実績報告書 (慶應義塾大学)  2017

• Unified study of high-energy and condensed-matter physics based on topology

  Yamamoto, Naoki

  科学研究費補助金研究成果報告書 2015

Reviews, Commentaries, etc. 【 Display / hide 】

Reviews, Commentaries, etc. 【 Display / hide 】

• Physics of Relativistic Chiral Matter

  Naoki Yamamoto

  日本物理学会誌 (日本物理学会)  80 ( 7 ) 395 - 403 2025.07

  Article, review, commentary, editorial, etc. (other)

• カイラリティと宇宙

  山本 直希

  数理科学（特集：カイラリティとは何か） 59 ( 3 ) 45 - 51 2021.03

  Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media), Single Work

• トポロジカル輸送現象入門

  山本 直希

  原子核研究 64   22 - 29 2020.02

  Article, review, commentary, editorial, etc. (scientific journal)

• Chiral Transport Phenomena

  山本 直希

  原子核研究 63 ( 2 ) 72 - 73 2019.03

  Article, review, commentary, editorial, etc. (scientific journal), Single Work

• 相対論的流体力学

  山本 直希

  数理科学（特集：相対論的思考法のすすめ） 55 ( 8 ) 36 - 42 2017.08

  Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media), Single Work

Presentations 【 Display / hide 】

Presentations 【 Display / hide 】

• Color superconductivity revisited

  Naoki Yamamoto

  [International presentation]  ExHIC (Exotics from Heavy Ion Collisions) workshop (Uni Hotel Jeju) , 

  2025.11

  , 

  Oral presentation (invited, special)

• Self-similar inverse cascade from generalized symmetries

  山本直希

  [Domestic presentation]  日本物理学会第80回年次大会 (広島大学) , 

  2025.09

  , 

  Oral presentation (general), 日本物理学会

• Turbulent inverse cascade and higher-form symmetries

  Naoki Yamamoto

  ASU-AUST-USTC online Theoretical Physics Colloquium (Online) , 

  2025.05

  , 

  Public lecture, seminar, tutorial, course, or other speech

• Turbulent inverse cascade and higher-form symmetries

  Naoki Yamamoto

  High-TheQ online seminar (Online) , 

  2025.04

  , 

  Public lecture, seminar, tutorial, course, or other speech

• From parity violation of the weak interaction to chiral MHD turbulence in supernovae

  Naoki Yamamoto

  [International presentation]  Breaking New Ground in Supernova Physics 2025 (Fukuoka University) , 

  2025.02

  , 

  Oral presentation (invited, special)

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Research Projects of Competitive Funds, etc. 【 Display / hide 】

Research Projects of Competitive Funds, etc. 【 Display / hide 】

• ニュートリノカイラル輸送理論で解き明かす中性子星磁場の起源と超新星の爆発機構

  2024.04

  -

  2027.03

  基盤研究(B), Principal investigator

• 素粒子論に基づく超新星のカイラル輻射流体力学の構築

  2019.04

  -

  2022.03

  MEXT,JSPS, Grant-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Principal investigator

• カイラル輸送現象による超新星爆発・初期宇宙の新物理

  2016.04

  -

  2019.03

  MEXT,JSPS, Grant-in-Aid for Scientific Research, Grant-in-Aid for Young Scientists (B), Principal investigator

Works 【 Display / hide 】

Works 【 Display / hide 】

• 他研究所セミナー招待講演（京都大学 基礎物理学研究所）

  山本直希

  京都大学基礎物理学研究所, 

  2026.01

  , 

  Other, Single

• 他大学セミナー講演（大阪大学 素粒子論研究室）

  山本 直希

  大阪大学, 

  2025.12

  , 

  Other, Single

  　View Details

  Turbulent inverse cascade and higher-form symmetries

• 他大学セミナー講演（新潟大学 原子核理論研究室）

  山本 直希

  新潟大学, 

  2025.11

  , 

  Other, Single

  　View Details

  カラー超伝導と非可換ゲージ理論としてのQCD

• 他研究所セミナー招待講演（東京大学 物性研究所）

  山本直希

  東京大学物性研究所, 

  2025.04

  , 

  Other, Single

• 他大学セミナー招待講演（大阪大学 素粒子論研究室）

  山本直希

  大阪大学 素粒子論研究室, 

  2024.11

  , 

  Other, Single

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Awards 【 Display / hide 】

Awards 【 Display / hide 】

• American Physical Society Outstanding Referee

  Naoki Yamamoto, 2023.02, American Physical Society

  Type of Award： Other

• 第37回 西宮湯川記念賞

  山本 直希, 2022.12, 西宮市, カイラル運動論の構築と応用

  Type of Award： Other

• 第28回 井上研究奨励賞

  山本 直希, 2012.02, 井上科学振興財団, 高密度QCDにおけるハドロン・クォーク連続性と双対性

  Type of Award： Award from publisher, newspaper, foundation, etc.

• 2009年度 東京大学 大学院理学系研究科 研究奨励賞（博士）

  山本 直希, 2010.03, 東京大学 大学院理学系研究科

  Type of Award： Other

Courses Taught 【 Display / hide 】

Courses Taught 【 Display / hide 】

• QUANTUM MECHANICS 3

  2025

• PHYSICS B

  2025

• PHYSICS A

  2025

• NUCLEAR PHYSICS

  2025

• LITERATURE OF PHYSICS

  2025

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Social Activities 【 Display / hide 】

Social Activities 【 Display / hide 】

• 西宮湯川記念こども課外教室－未来の科学者たちへ－

  西宮市,  (西宮市立苦楽園小学校)

  , 

  2022.12

Memberships in Academic Societies 【 Display / hide 】

Memberships in Academic Societies 【 Display / hide 】

• 日本物理学会, 

  2006.09

  -

  Present