Yamamoto, Naoki

写真a

Affiliation

Faculty of Science and Technology, Department of Physics (Yagami)

Position

Associate Professor

Related Websites

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

  • 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

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

 

Research Areas 【 Display / hide

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

 

Papers 【 Display / hide

  • Photonic spin Hall effect from quantum kinetic theory in curved spacetime

    Kazuya Mameda, Naoki Yamamoto, Di-Lun Yang

    Physical Review D 105   096019(1-9) 2022.05

    Research paper (scientific journal), Joint Work, Accepted

  • Magnetic field induced neutrino chiral transport near equilibrium

    Naoki Yamamoto, Di-Lun Yang

    Physical Review D 104 ( 12 ) 123019(1-15) 2021.12

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

     View Summary

    Based on the recently formulated chiral radiation transport theory for left-handed neutrinos, we study the chiral transport of neutrinos near thermal equilibrium in core-collapse supernovae. We first compute the near-equilibrium solution of the chiral radiation transport equation under the relaxation time approximation, where the relaxation time is directly derived from the effective field theory of the weak interaction. By using such a solution, we systematically derive analytic expressions for the nonequilibrium corrections of the neutrino energy-momentum tensor and neutrino number current induced by magnetic fields via the neutrino absorption on nucleons. In particular, we find the nonequilibrium neutrino energy current proportional to the magnetic field. We also discuss its phenomenological consequences such as the possible relation to pulsar kicks.

  • Chiral soliton lattice phase in warm QCD

    Tomáš Brauner, Helena Kolešová, Naoki Yamamoto

    Physics Letters B 823 ( 10 ) 136767(1-7) 2021.11

    Research paper (scientific journal), Joint Work, Accepted,  ISSN  03702693

     View Summary

    We analyze the phase diagram of quantum chromodynamics at low-to-moderate temperature, baryon chemical potential and external magnetic field within chiral perturbation theory at next-to-leading order of the derivative expansion. Our main result is that the anomaly-induced chiral soliton lattice (CSL) phase is stabilized by thermal fluctuations. As a consequence, the CSL state may survive up to temperatures at which chiral symmetry is restored.

  • Floquet vacuum engineering: Laser-driven chiral soliton lattice in the QCD vacuum

    Akihiro Yamada, Naoki Yamamoto

    Physical Review D 104 ( 5 ) 054041(1-7) 2021.09

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

     View Summary

    What happens to the QCD vacuum when a time-periodic circularly polarized laser field with a sufficiently large intensity and frequency is applied? Based on the Floquet formalism for periodically driven systems and the systematic low-energy effective theory of QCD, we show that for a sufficiently large frequency and above a critical intensity, the QCD vacuum is unstable against the chiral soliton lattice of pions; a crystalline structure of topological solitons that spontaneously breaks parity and continuous translational symmetries. Our work would pave the way for novel “Floquet vacuum engineering.”

  • Positive magnetoresistance induced by hydrodynamic fluctuations in chiral media

    Noriyuki Sogabe, Naoki Yamamoto, Yi Yin

    Journal of High Energy Physics 09 ( 131 ) 1 - 31 2021.09

    Research paper (scientific journal), Joint Work, Accepted

     View Summary

    We analyze the combined effects of hydrodynamic fluctuations and chiral magnetic effect (CME) for a chiral medium in the presence of a background magnetic field. Based on the recently developed non-equilibrium effective field theory, we show fluctuations give rise to a CME-related positive contribution to magnetoresistance, while the early studies without accounting for the fluctuations find a CME-related negative magnetoresistance. At zero axial relaxation rate, the fluctuations contribute to the transverse conductivity in addition to the longitudinal one.

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

Reviews, Commentaries, etc. 【 Display / hide

  • 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

  • Chiral radiation transport theory of neutrinos in supernovae

    Naoki Yamamoto

    Emergent Hydrodynamics in Condensed Matter and High-energy Physics (Online) , 

    2022.05

    Oral presentation (invited, special)

  • Chirality: from particle physics to astrophysics

    山本 直希

    Molecular Chirality 2021 (東広島芸術文化ホール くらら) , 

    2021.11

    Oral presentation (invited, special)

  • トポロジカル輸送現象と素粒子物理

    山本 直希

    奥羽越素粒子論研究会 (オンライン) , 

    2021.11

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

  • Chiral radiation transport theory of neutrinos

    Naoki Yamamoto, Di-Lun Yang

    Helicity and space-time symmetry ― a new perspective of classical and quantum systems (Online) , 

    2021.10

    Oral presentation (invited, special)

  • ヘリカル磁気効果

    山本 直希, Di-Lun Yang

    日本物理学会2021年秋季大会 (オンライン) , 

    2021.09

    Oral presentation (general)

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

  • 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

  • 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

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    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

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    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

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    Chirality and Astrophysics

  • 他大学セミナー招待講演(東京大学 駒場キャンパス 素粒子論研究室)

    東京大学 駒場キャンパス 素粒子論研究室, 

    2017.12

    Other

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    カイラル輸送現象:ニュートリノから超新星爆発へ

  • 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, 

    2017.12

    Other

     View Details

    Chirality, Topology, and Astrophysics

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Awards 【 Display / hide

  • 第28回 井上研究奨励賞

    2012.02, 井上科学振興財団

    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)

    2010.03, 東京大学 大学院理学系研究科

    Type of Award: Other

 

Courses Taught 【 Display / hide

  • QUANTUM MECHANICS 3

    2022

  • NUCLEAR PHYSICS

    2022

  • LITERATURE OF PHYSICS

    2022

  • LIBERAL ARTS AND SCIENCES SEMINAR 2

    2022

  • INDEPENDENT STUDY ON FUNDAMENTAL SCIENCE AND TECHNOLOGY

    2022

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Memberships in Academic Societies 【 Display / hide

  • 日本物理学会, 

    2006.09
    -
    Present