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

Papers 【 Display / hide 】

Papers 【 Display / hide 】

• 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)

• Convergence of Ginzburg–Landau Expansions: Superconductivity in the Bardeen–Cooper–Schrieffer Theory and Chiral Symmetry Breaking in the Nambu–Jona-Lasinio Model

  William Gyory, Naoki Yamamoto

  Progress of Theoretical and Experimental Physics (The Physical Society of Japan)  2024 ( 4 ) 043D01(1-19) 2024.03

  Research paper (scientific journal), Joint Work, Accepted

  • Access to Document (DOI)

• Dipole symmetries from the topology of the phase space and the constraints on the low-energy spectrum

  Tomáš Brauner, Naoki Yamamoto, Ryo Yokokura

  SciPost Physics 16 ( 2 ) 051:1 - 051:32 2024.02

  Research paper (scientific journal), Joint Work, Accepted

  　View Summary

  We demonstrate the general existence of a local dipole conservation law in bosonic field theory. The scalar charge density arises from the symplectic form of the system, whereas the tensor current descends from its stress tensor. The algebra of spatial translations becomes centrally extended in presence of field configurations with a finite nonzero charge. Furthermore, when the symplectic form is closed but not exact, the system may, surprisingly, lack a well-defined momentum density. This leads to a theorem for the presence of additional light modes in the system whenever the short-distance physics is governed by a translationally invariant local field theory. We also illustrate this mechanism for axion electrodynamics as an example of a system with Nambu–Goldstone modes of higher-form symmetries.

  • Access to Document (DOI)

• Chiral asteroseismology: seismic oscillations caused by chiral transport in neutron stars and supernovae

  Sota Hanai, Naoki Yamamoto

  Journal of Cosmology and Astroparticle Physics 10 ( 018 ) 1 - 25 2023.10

  Research paper (scientific journal), Joint Work, Accepted

  　View Summary

  We study the novel asteroseismology of the chiral magnetic wave (CMW) of the quark number density in relativistic quark matter inside neutron stars and core-collapse supernovae and the chiral vortical wave (CVW) of the neutrino number density in relativistic neutrino matter at the core of supernovae. We call the oscillation modes for these chiral waves the chiral magnetic mode (CM-mode) and chiral vortical mode (CV-mode), respectively. We derive the dispersion relations of these new modes in the presence of the chirality flipping due to the finite quark mass and diffusion. We then estimate the possible frequencies of these modes and amplitudes of the resulting gravitational waves. In particular, since the CM-mode can exist only in quark matter with nearly gapless quarks (such as the two-flavor color superconductivity) for a sufficiently strong magnetic field, corresponding gravitational waves provide a new possible probe for such quark matter and the magnetic field in neutron stars.

  • Access to Document (DOI)

• Generalized chiral instabilities, linking numbers, and non-invertible symmetries

  Naoki Yamamoto, Ryo Yokokura

  Journal of High Energy Physics 07 ( 45 ) 1 - 29 2023.07

  Research paper (scientific journal), Joint Work, Accepted

  　View Summary

  We demonstrate a universal mechanism of a class of instabilities in infrared regions for massless Abelian p-form gauge theories with topological interactions, which we call generalized chiral instabilities. Such instabilities occur in the presence of initial electric fields for the p-form gauge fields. We show that the dynamically generated magnetic fields tend to decrease the initial electric fields and result in configurations with linking numbers, which can be characterized by non-invertible global symmetries. The so-called chiral plasma instability and instabilities of the axion electrodynamics and (4+1)-dimensional Maxwell-Chern-Simons theory in electric fields can be described by the generalized chiral instabilities in a unified manner. We also illustrate this mechanism in the (2+1)-dimensional Goldstone-Maxwell model in electric field.

  • 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 】

• Crossover Between Quark Nuclear Matter and Condensed-Matter Physics

  Tomáš Brauner, Naoki Yamamoto

  Handbook of Nuclear Physics (Springer)     1 - 25 2022.07

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

  • Access to Document (DOI)

• 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 】

• Parity violation of the weak interaction and supernovae

  Naoki Yamamoto

  10th international conference of the workshop series "Compact Stars in the QCD phase diagram" (Yukawa Institute of Theoretical Physics) , 

  2024.10

  , 

  Oral presentation (invited, special)

• 高密度QCDにおける量子ホール液滴

  山本直希

  日本物理学会 第79回年次大会 (北海道大学) , 

  2024.09

  , 

  Oral presentation (general), 日本物理学会

• 弱い力のパリティの破れと超新星・中性子星の物理

  山本 直希

  素粒子物理学の進展2024 (京都大学基礎物理学研究所) , 

  2024.08

  , 

  Oral presentation (invited, special)

• Chiral Effects and Astrophysics

  Naoki Yamamoto

  The 20th International Conference on QCD in Extreme Conditions (XQCD 2024) (Lanzhou) , 

  2024.07

  , 

  Oral presentation (invited, special), Institute of Modern Physics (IMP), Chinese Academy of Sciences

• カイラル運動論とその応用

  山本直希

  日本物理学会2024年春季大会 (オンライン) , 

  2024.03

  , 

  Oral presentation (invited, special), 日本物理学会

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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 】

• 他大学セミナー講演（東北大学 原子核理論研究室）

  山本 直希

  東北大学, 

  2023.11

  , 

  Other, Single

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  弱い力のパリティの破れと超新星

• 他大学セミナー招待講演（東京工業大学 宇宙論研究室）

  山本 直希

  東京工業大学, 

  2022.07

  , 

  Other

  　View Details

  Gravitational Spin Hall Effect

• 他研究所セミナー招待講演（高エネルギー加速器研究機構）

  山本 直希

  オンライン, 

  2020.07

  , 

  Other

  　View Details

  Magnetic monopoles and fermion number violation in chiral matter

• 他研究所セミナー招待講演（高エネルギー加速器研究機構）

  山本 直希

  高エネルギー加速器研究機構, 

  2019.06

  , 

  Other

  　View Details

  Chiral Soliton Lattice in QCD

• 他大学セミナー招待講演（早稲田大学 天体物理学研究室）

  早稲田大学 天体物理学研究室, 

  2018.07

  , 

  Other

  　View Details

  Chirality and Astrophysics

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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 】

• LITERATURE OF PHYSICS

  2024

• INDEPENDENT STUDY ON FUNDAMENTAL SCIENCE AND TECHNOLOGY

  2024

• GRADUATE RESEARCH ON FUNDAMENTAL SCIENCE AND TECHNOLOGY 2

  2024

• GRADUATE RESEARCH ON FUNDAMENTAL SCIENCE AND TECHNOLOGY 1

  2024

• BACHELOR'S THESIS

  2024

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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