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

 

Papers 【 Display / hide

  • Topological mass generation in gapless systems

    Naoki Yamamoto, Ryo Yokokura

    Physical Review D 104   025010(1-17) 2021.07

    Research paper (scientific journal), Joint Work, Accepted

  • Helical magnetic effect and the chiral anomaly

    Naoki Yamamoto, Di-Lun Yang

    Physical Review D 103 ( 12 ) 125003(1-7) 2021.06

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

     View Summary

    In the presence of the fluid helicity v·ω, the magnetic field induces an electric current of the form j=C_{HME}(v·ω)B. This is the helical magnetic effect (HME). We show that for massless Dirac fermions with charge e=1, the transport coefficient CHME is fixed by the chiral anomaly coefficient C=1/(2π^2) as C_{HME}=C/2 independently of interactions. We show the conjecture that the coefficient of the magnetovorticity coupling for the local vector charge, n=CBωB·ω, is related to the chiral anomaly coefficient as CBω=C/2. We also discuss the condition for the emergence of the helical plasma instability that originates from the HME.

  • Wigner functions and quantum kinetic theory of polarized photons

    Koichi Hattori, Yoshimasa Hidaka, Naoki Yamamoto, Di-Lun Yang

    Journal of High Energy Physics 02 ( 1 ) 1 - 26 2021.02

    Research paper (scientific journal), Joint Work, Accepted

     View Summary

    © 2021, The Author(s). We derive the Wigner functions of polarized photons in the Coulomb gauge with the ħ expansion applied to quantum field theory, and identify side-jump effects for massless photons. We also discuss the photonic chiral vortical effect for the Chern-Simons current and zilch vortical effect for the zilch current in local thermal equilibrium as a consistency check for our formalism. The results are found to be in agreement with those obtained from different approaches. Moreover, using the real-time formalism, we construct the quantum kinetic theory (QKT) for polarized photons. By further adopting a specific power counting scheme for the distribution functions, we provide a more succinct form of an effective QKT. This photonic QKT involves quantum corrections associated with self-energy gradients in the collision term, which are analogous to the side-jump corrections pertinent to spin-orbit interactions in the chiral kinetic theory for massless fermions. The same theoretical framework can also be directly applied to weakly coupled gluons in the absence of background color fields.

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

    Kentaro Nishimura, Naoki Yamamoto

    Journal of High Energy Physics 07 ( 196 ) 1 - 23 2020.07

    Research paper (scientific journal), Joint Work, Accepted,  ISSN  11266708

     View Summary

    We study the ground states of low-density hadronic matter and high-density color-flavor locked color superconducting phase in three-flavor QCD at finite baryon chemical potential under rotation. We find that, in both cases under sufficiently fast rotation, the combination of the rotation-induced topological term for the η′ meson and the QCD anomaly leads to an inhomogeneous condensate of the η′ meson, known as the chiral soliton lattice (CSL). We find that, when baryon chemical potential is much larger than isospin chemical potential, the critical angular velocity for the realization of the η′ CSL is much smaller than that for the π0 CSL found previously. We also argue that the η′ CSL states in flavor-symmetric QCD at low density and high density should be continuously connected, extending the quark-hadron continuity conjecture in the presence of the rotation.

  • Chiral Radiation Transport Theory of Neutrinos

    Naoki Yamamoto, Di-Lun Yang

    Astrophysical Journal 895 ( 1 ) 1 - 16 2020.05

    Research paper (scientific journal), Joint Work, Accepted,  ISSN  0004637X

     View Summary

    We construct the chiral radiation transport equation for left-handed neutrinos in the context of radiation hydrodynamics for core-collapse supernovae. Based on the chiral kinetic theory incorporating quantum corrections due to the chirality of fermions, we derive a general relativistic form of the chiral transfer equation with collisions. We show that such quantum corrections explicitly break the spherical symmetry and axisymmetry of the system. In the inertial frame, in particular, we find that the so-called side jump leads to quantum corrections in the collisions between neutrinos and matter. We also derive analytic forms of such corrections in the emission and absorption rates for the neutrino absorption process. These corrections result in the generation of kinetic helicity and cross helicity of matter, which should then modify the subsequent evolution of matter. This theoretical framework can be applied to investigate the impacts of the chirality of neutrinos on the evolution of core-collapse supernovae.

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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

    Introduction and explanation (commerce magazine), 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

    Introduction and explanation (scientific journal)

  • Chiral Transport Phenomena

    山本 直希

    原子核研究 63 ( 2 ) 72 - 73 2019.03

    Introduction and explanation (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

    Introduction and explanation (commerce magazine), Single Work

Presentations 【 Display / hide

  • 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)

  • Chiral Soliton Lattice in QCD

    Naoki Yamamoto

    Topological aspects of strong correlations and gauge theories (Online) , 2021.09, Oral Presentation(guest/special)

  • ニュートリノのカイラル輻射輸送理論

    山本 直希, Di-Lun Yang

    日本物理学会第76回年次大会 (オンライン) , 2021.03, Oral Presentation(general)

  • QCD chiral soliton lattice and nonrelativistic photons

    Naoki Yamamoto

    Topological Phases of Matter: From Low to High Energy (Online) , 2021.03, Oral Presentation(guest/special),  Institute for Nuclear Theory

  • Applications of chiral kinetic theory

    Naoki Yamamoto

    Extreme Nonequilibrium QCD (Online) , 2020.10, Oral Presentation(guest/special)

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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, 山本 直希, 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, 山本 直希, 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

     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

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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: Awards of Publisher, Newspaper Company and Foundation

  • 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 Awards

 

Courses Taught 【 Display / hide

  • QUARK-HADRON PHYSICS

    2021

  • QUANTUM MECHANICS 3

    2021

  • NUCLEAR PHYSICS

    2021

  • LITERATURE OF PHYSICS

    2021

  • INDEPENDENT STUDY ON FUNDAMENTAL SCIENCE AND TECHNOLOGY

    2021

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Memberships in Academic Societies 【 Display / hide

  • 日本物理学会, 

    2006.09
    -
    Present