Updated on 2024/06/22

写真a

 
HONGO Masaru
 
Organization
Academic Assembly Institute of Science and Technology Fundamental Sciences Assistant Professor
Faculty of Science Assistant Professor
Graduate School of Science and Technology Fundamental Sciences Assistant Professor
Title
Assistant Professor
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Degree

  • PhD in Physics ( 2016.3   The University of Tokyo )

  • M.Sc. in Physics ( 2013.3   The University of Tokyo )

  • B.Sc. in Physics ( 2011.3   The University of Tokyo )

Research Interests

  • Anomaly

  • Hydrodynamics

  • Nonequilibrium statistical mechanics

  • Effective field theory

Research Areas

  • Natural Science / Mathematical physics and fundamental theory of condensed matter physics

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

Research History (researchmap)

  • Niigata University   Faculty of Science Department of Science   Assistant Professor

    2022.4

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    Country:Japan

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  • University of Illinois Chicago   Department of Physics   Postdoctoral Research Associate

    2019.10 - 2022.3

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    Country:United States

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  • Keio University   Research and Education Center for Natural Sciences   Specially Appointed Assistant Professor

    2019.4 - 2019.9

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    Country:Japan

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  • RIKEN   Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS)   Special Postdoctoral Researcher

    2018.4 - 2019.3

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    Country:Japan

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  • RIKEN   Interdisciplinary Theoretical Science Research Group (iTHES)   Special Postdoctoral Researcher

    2016.4 - 2018.3

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    Country:Japan

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Research History

  • Niigata University   Faculty of Science   Assistant Professor

    2022.4

  • Niigata University   Fundamental Sciences, Graduate School of Science and Technology   Assistant Professor

    2022.4

  • Niigata University   Fundamental Sciences, Institute of Science and Technology, Academic Assembly   Assistant Professor

    2022.4

Education

  • The University of Tokyo   Graduate School of Science   Department of Physics

    2011.4 - 2016.3

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    Country: Japan

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  • The University of Tokyo   Faculty of Science   Department of Physics

    2007.4 - 2011.3

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    Country: Japan

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Professional Memberships

  • The Physical Society of Japan

    2013.3

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Papers

  • Spin relaxation rate for baryons in a thermal pion gas

    Yoshimasa Hidaka, Masaru Hongo, Mikhail A. Stephanov, Ho-Ung Yee

    Physical Review C   109 ( 5 )   2024.5

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    Publishing type:Research paper (scientific journal)   Publisher:American Physical Society (APS)  

    We study the relaxation dynamics of the spin polarization of baryons (nucleon and Λ baryon), in a thermal pion gas as a simple model of the hadronic phase of the QCD plasma produced in relativistic heavy-ion collisions. For this purpose, we formulate the quantum kinetic theory for the spin density matrix of baryons in the leading order of the gradient expansion. Considering the baryon-pion elastic scattering processes as the dominant interaction between baryons and thermal pions, we compute the spin relaxation rate of nucleons and Λ baryons in a pion gas up to temperature 200 MeV. In the case of nucleons, we evaluate the spin relaxation rate in the s-channel resonance approximation, based on the known experimental data on Δ resonances. We also estimate the spin relaxation rate for Λ baryons, based on experimental inputs and theoretical models for the low-energy Λπ scattering, including the chiral perturbation theory.

    Published by the American Physical Society 2024

    DOI: 10.1103/physrevc.109.054909

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    Other Link: http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevC.109.054909/fulltext

  • Universal van der Waals Force between Heavy Polarons in Superfluids

    Keisuke Fujii, Masaru Hongo, Tilman Enss

    Physical Review Letters   129 ( 23 )   2022.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Physical Society ({APS})  

    DOI: 10.1103/physrevlett.129.233401

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  • New Developments in Relativistic Magnetohydrodynamics

    Koichi Hattori, Masaru Hongo, Xu-Guang Huang

    Symmetry   14 ( 9 )   1851 - 1851   2022.9

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:MDPI AG  

    Relativistic magnetohydrodynamics (RMHD) provides an extremely useful description of the low-energy long-wavelength phenomena in a variety of physical systems from quark–gluon plasma in heavy-ion collisions to matters in supernova, compact stars, and early universe. We review the recent theoretical progresses of RMHD, such as a formulation of RMHD from the perspective of magnetic flux conservation using the entropy–current analysis, the nonequilibrium statistical operator approach applied to quantum electrodynamics, and the relativistic kinetic theory. We discuss how the transport coefficients in RMHD are computed in kinetic theory and perturbative quantum field theories. We also explore the collective modes and instabilities in RMHD with a special emphasis on the role of chirality in a parity-odd plasma. We also give some future prospects of RMHD, including the interaction with spin hydrodynamics and the new kinetic framework with magnetic flux conservation.

    DOI: 10.3390/sym14091851

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  • Spin relaxation rate for heavy quarks in weakly coupled QCD plasma

    Masaru Hongo, Xu-Guang Huang, Matthias Kaminski, Mikhail Stephanov, Ho-Ung Yee

    Journal of High Energy Physics   2022 ( 8 )   2022.8

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    Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    Abstract

    We compute the relaxation rate of the spin density of heavy quarks in a perturbative QCD plasma to leading-log order in the coupling constant g. The spin relaxation rate Γ<sub>s</sub> in spin hydrodynamics is shown to be Γ<sub>s</sub> ~ g<sup>4</sup> log(1/g)T(T/M)<sup>2</sup> in the heavy-quark limit T/M ≪ 1, which is smaller than the relaxation rate of other non- hydrodynamic modes by additional powers of T/M. We demonstrate three different methods to evaluate the spin relaxation rate: 1) the Green-Kubo formula in the spin hydrodynamic regime, 2) the spin density correlation function in the strict hydrodynamic limit, and 3) quantum kinetic theory of the spin distribution function in momentum space. We highlight the interesting differences between these methods, while they are ultimately connected to each other by the underlying Ward-Takahashi identity for the non-conserved spin density.

    DOI: 10.1007/jhep08(2022)263

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    Other Link: https://link.springer.com/article/10.1007/JHEP08(2022)263/fulltext.html

  • Gyrohydrodynamics: Relativistic spinful fluid with strong vorticity

    Zheng Cao, Koichi Hattori, Masaru Hongo, Xu-Guang Huang, Hidetoshi Taya

    Progress of Theoretical and Experimental Physics   2022 ( 7 )   2022.7

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    Publishing type:Research paper (scientific journal)   Publisher:Oxford University Press (OUP)  

    Abstract

    We develop a relativistic (quasi-)hydrodynamic framework, dubbed gyrohydrodynamics, to describe the fluid dynamics of many-body systems with spin under strong vorticity based on entropy-current analysis. This framework generalizes the recently developed spin hydrodynamics to the regime where the spin density is at the leading order in derivatives but suppressed by another small parameter, the Planck constant ℏ, due to its quantum nature. Our analysis shows that the complete first-order constitutive relations of gyrohydrodynamics involve 17 transport coefficients and are highly anisotropic.

    DOI: 10.1093/ptep/ptac091

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    Other Link: https://academic.oup.com/ptep/article-pdf/2022/7/071D01/45186985/ptac091.pdf

  • Quantum hydrodynamics from local thermal pure states

    Shoichiro Tsutsui, Masaru Hongo, Shintaro Sato, Takahiro Sagawa

    Physical Review Research   4 ( 3 )   2022.7

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Physical Society ({APS})  

    DOI: 10.1103/physrevresearch.4.033059

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    Other Link: http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevResearch.4.033059/fulltext

  • Universal Properties of Weakly Bound Two-Neutron Halo Nuclei

    Masaru Hongo, Dam Thanh Son

    Physical Review Letters   128 ( 21 )   2022.5

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Physical Society ({APS})  

    DOI: 10.1103/physrevlett.128.212501

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  • Effective field theory of fluctuating wall in open systems: from a kink in Josephson junction to general domain wall

    Keisuke Fujii, Masaru Hongo

    SciPost Physics   12 ( 5 )   2022.5

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    Publishing type:Research paper (scientific journal)   Publisher:Stichting {SciPost}  

    <jats:p>We investigate macroscopic behaviors of fluctuating domain walls in nonequilibrium open systems with the help of the effective field theory based on symmetry.
    Since the domain wall in open systems breaks the translational symmetry, there appears a gapless excitation identified as the Nambu-Goldstone (NG) mode, which shows the non-propagating diffusive behavior in contrast to those in closed systems.
    After demonstrating the presence of the diffusive NG mode in the (2+1)-dimensional dissipative Josephson junction, we provide a symmetry-based general analysis for open systems breaking the one-dimensional translational symmetry.
    A general effective Lagrangian is constructed based on the Schwinger-Keldysh formalism, which supports the presence of the gapless diffusion mode in the fluctuation spectrum
    in the thin wall regime.
    Besides, we also identify a term peculiar to the open system, which possibly leads to the instability in the thick-wall regime or the nonlinear Kardar-Parisi-Zhang coupling in the thin-wall regime although it is absent in the Josephson junction.</jats:p>

    DOI: 10.21468/scipostphys.12.5.160

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  • Anomaly-induced edge currents in hydrodynamics with parity anomaly

    Takuya Furusawa, Masaru Hongo

    Physical Review D   104 ( 12 )   2021.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Physical Society ({APS})  

    DOI: 10.1103/physrevd.104.125021

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  • Relativistic spin hydrodynamics with torsion and linear response theory for spin relaxation

    Masaru Hongo, Xu-Guang Huang, Matthias Kaminski, Mikhail Stephanov, Ho-Ung Yee

    Journal of High Energy Physics   2021 ( 11 )   2021.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media {LLC}  

    <jats:title>A<jats:sc>bstract</jats:sc>
    </jats:title><jats:p>Using the second law of local thermodynamics and the first-order Palatini formalism, we formulate relativistic spin hydrodynamics for quantum field theories with Dirac fermions, such as QED and QCD, in a torsionful curved background. We work in a regime where spin density, which is assumed to relax much slower than other non-hydrodynamic modes, is treated as an independent degree of freedom in an extended hydrodynamic description. Spin hydrodynamics in our approach contains only three non-hydrodynamic modes corresponding to a spin vector, whose relaxation time is controlled by a new transport coefficient: the rotational viscosity. We study linear response theory and observe an interesting mode mixing phenomenon between the transverse shear and the spin density modes. We propose several field-theoretical ways to compute the spin relaxation time and the rotational viscosity, via the Green-Kubo formula based on retarded correlation functions.</jats:p>

    DOI: 10.1007/jhep11(2021)150

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  • Analytical WKB theory for high-harmonic generation and its application to massive Dirac electrons

    Hidetoshi Taya, Masaru Hongo, Tatsuhiko N. Ikeda

    Physical Review B   104 ( 14 )   2021.10

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Physical Society ({APS})  

    DOI: 10.1103/physrevb.104.l140305

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    Other Link: http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevB.104.L140305/fulltext

  • Effective field theory of magnons: Chiral magnets and the Schwinger mechanism

    Masaru Hongo, Toshiaki Fujimori, Tatsuhiro Misumi, Muneto Nitta, Norisuke Sakai

    Physical Review B   104 ( 13 )   2021.10

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Physical Society ({APS})  

    DOI: 10.1103/physrevb.104.134403

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    Other Link: http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevB.104.134403/fulltext

  • Microscopic Theory of Fluctuating Hydrodynamics in Nonlinear Lattices

    Keiji Saito, Masaru Hongo, Abhishek Dhar, Shin-ichi Sasa

    Physical Review Letters   127 ( 1 )   2021.7

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Physical Society ({APS})  

    DOI: 10.1103/physrevlett.127.010601

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    Other Link: http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevLett.127.010601/fulltext

  • Effective Lagrangian for Nambu-Goldstone modes in nonequilibrium open systems

    Masaru Hongo, Suro Kim, Toshifumi Noumi, Atsuhisa Ota

    Physical Review D   103 ( 5 )   2021.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Physical Society ({APS})  

    DOI: 10.1103/physrevd.103.056020

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  • Revisiting relativistic magnetohydrodynamics from quantum electrodynamics

    Masaru Hongo, Koichi Hattori

    Journal of High Energy Physics   2021 ( 2 )   2021.2

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media {LLC}  

    <jats:title>A<jats:sc>bstract</jats:sc>
    </jats:title><jats:p>We provide a statistical mechanical derivation of relativistic magnetohydrodynamics on the basis of (3 + 1)-dimensional quantum electrodynamics; the system endowed with a magnetic one-form symmetry. The conservation laws and constitutive relations are presented in a manifestly covariant way with respect to the general coordinate transformation. The method of the local Gibbs ensemble (or nonequilibrium statistical operator) combined with the path-integral formula for a thermodynamic functional enables us to obtain exact forms of constitutive relations. Applying the derivative expansion to exact formulas, we derive the first-order constitutive relations for nonlinear relativistic magnetohydrodynamics. Our results for the QED plasma preserving parity and charge-conjugation symmetries are equipped with two electrical resistivities and five (three bulk and two shear) viscosities. We also show that those transport coefficients satisfy the Onsager’s reciprocal relation and a set of inequalities, indicating semi-positivity of the entropy production rate consistent with the local second law of thermodynamics.</jats:p>

    DOI: 10.1007/jhep02(2021)011

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  • Global anomaly matching in the higher-dimensional CPN−1 model

    Takuya Furusawa, Masaru Hongo

    Physical Review B   101 ( 15 )   2020.4

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Physical Society ({APS})  

    DOI: 10.1103/physrevb.101.155113

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  • Instantons in chiral magnets

    Masaru Hongo, Toshiaki Fujimori, Tatsuhiro Misumi, Muneto Nitta, Norisuke Sakai

    Physical Review B   101 ( 10 )   2020.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Physical Society ({APS})  

    DOI: 10.1103/physrevb.101.104417

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    Other Link: https://link.aps.org/article/10.1103/PhysRevB.101.104417

  • Fate of spin polarization in a relativistic fluid: An entropy-current analysis

    Koichi Hattori, Masaru Hongo, Xu-Guang Huang, Mamoru Matsuo, Hidetoshi Taya

    Physics Letters B   795   100 - 106   2019.8

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier {BV}  

    DOI: 10.1016/j.physletb.2019.05.040

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  • Anomaly-Induced Transport Phenomena from Imaginary-Time Formalism

    Masaru Hongo, Yoshimasa Hidaka

    Particles   2 ( 2 )   261 - 280   2019.5

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:{MDPI} {AG}  

    <jats:p>A derivation of anomaly-induced transport phenomena—the chiral magnetic/vortical effect—is revisited based on the imaginary-time formalism of quantum field theory. Considering the simplest anomalous system composed of a single Weyl fermion, we provide two derivations: perturbative (one-loop) evaluation of the anomalous transport coefficient, and the anomaly matching for the local thermodynamic functional.</jats:p>

    DOI: 10.3390/particles2020018

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  • Nonrelativistic Hydrodynamics from Quantum Field Theory: (I) Normal Fluid Composed of Spinless Schrödinger Fields

    Masaru Hongo

    Journal of Statistical Physics   174 ( 5 )   1038 - 1079   2019.3

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media {LLC}  

    DOI: 10.1007/s10955-019-02224-4

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  • Effective field theory of time-translational symmetry breaking in nonequilibrium open system

    Masaru Hongo, Suro Kim, Toshifumi Noumi, Atsuhisa Ota

    Journal of High Energy Physics   2019 ( 2 )   2019.2

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media {LLC}  

    DOI: 10.1007/jhep02(2019)131

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  • Phase structure of the twisted SU(3)/U(1)2 flag sigma model on ℝ × S1

    Masaru Hongo

    Journal of High Energy Physics   2019.2

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

    DOI: 10.1007/jhep02(2019)070

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  • Does the chiral magnetic effect change the dynamic universality class in QCD?

    Masaru Hongo, Noriyuki Sogabe, Naoki Yamamoto

    Journal of High Energy Physics   2018 ( 11 )   2018.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media {LLC}  

    DOI: 10.1007/jhep11(2018)108

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  • Anomalous-hydrodynamic analysis of charge-dependent elliptic flow in heavy-ion collisions

    Masaru Hongo, Yuji Hirono, Tetsufumi Hirano

    Physics Letters B   775   266 - 270   2017.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier {BV}  

    DOI: 10.1016/j.physletb.2017.10.028

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  • Path-integral formula for local thermal equilibrium

    Masaru Hongo

    Annals of Physics   383   1 - 32   2017.8

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier {BV}  

    DOI: 10.1016/j.aop.2017.04.004

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  • Relativistic hydrodynamics from quantum field theory on the basis of the generalized Gibbs ensemble method

    Hayata, T., Hidaka, Y., Noumi, T., Hongo, M.

    Physical Review D - Particles, Fields, Gravitation and Cosmology   92 ( 6 )   2015

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1103/PhysRevD.92.065008

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  • Estimation of the electric conductivity of the quark gluon plasma via asymmetric heavy-ion collisions

    Hirono, Y., Hongo, M., Hirano, T.

    Physical Review C - Nuclear Physics   90 ( 2 )   2014

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1103/PhysRevC.90.021903

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MISC

Awards

  • Young Scientist Award of the Physical Society of Japan (Theoretical Nuclear Physics), 2019

    2019   Relativistic hydrodynamics from quantum field theory in the local Gibbs ensemble

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Teaching Experience

  • 原子核物理学

    2023
    Institution name:新潟大学

  • 物理学特論I

    2023
    Institution name:新潟大学

  • 学問の扉 知と方法の最前線

    2023
    Institution name:新潟大学

  • 有効場の理論

    2023
    Institution name:新潟大学

  • 量子研究の最前線

    2023
    Institution name:新潟大学

  • 理学スタディ・スキルズ

    2023
    Institution name:新潟大学

  • ハドロン物理学II

    2022
    Institution name:新潟大学

  • 量子力学IB

    2022
    Institution name:新潟大学

  • 量子力学IA

    2022
    Institution name:新潟大学

  • 複素解析

    2022
    Institution name:新潟大学

  • 量子力学演習I

    2022
    Institution name:新潟大学

  • 理学基礎演習

    2022
    Institution name:新潟大学

  • 現代物理学セミナーB

    2022
    Institution name:新潟大学

  • 現代物理学セミナーA

    2022
    Institution name:新潟大学

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