Faculty Members

Associate Professor
KOBAYASHI Michikazu

Doctor of Science, Osaka City University, Japan, 2006

Year of birth: 1978
Gender: Male
Affiliation:

- School of Engineering Science
- School of Environmental Science and Engineering
- Environmental and Mathematical Sciences, Department of Engineering, Graduate School of Enginering

Areas of specialization	Statistical Physics, Hydrodynamics, Quantum hydrodynamics
Laboratory/research office	Simulation Physics Laboratory Physics is one of the scientific areas which tries to understand natural phenomena predominantly by using mathematics. In particular, understanding phenomena manifested by many elements such as transition among solids, liquid, and gas, flow structures of water and air, life phenomena, social phenomena in human beings, and the formation of the universe, requires highly developed computational technique. Our laboratory is trying to solve various such problems of "many-body physics" through the use of computer simulations and visualizations.
Current research topics
Educational background	2006: Doctor, Osaka City University, Japan 2003: Master, Osaka City University, Japan 2001: Bachelor, Osaka City University, Japan
Professional background	2020-: Associate Professor in Kochi University of Technology, Associate Professor 2013-2020: Assistant Professor in Kyoto University, Assitant Professor 2009-2013: Assistant Professor in University of Tokyo, Assitant Professor 2008-2009: Research Fellowship for Young Scientists PD (University of Tokyo), JSPS PD 2006-2008: Postdoc in Osaka City University, Postdoc 2003-2006: Research Fellowship for Young Scientists DC1, JSPS DC1
Licenses
Academic societies	Physical Society of Japan Japan Music Expression Society

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Courses

* Courses provided in English are shown with (E) mark

Undergraduate school	Computer Literacy Data Science of Biological Environment 1 Data Science of Biological Environment 2 Graduation Thesis Physics and Material Experiment Mathematics for Science 1
Graduate school

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Research activities

Research papers	Authors: KOBAYASHI Michikazu, Naoko Nakagawa, Shin-ichi Sasa Title: Control of Metastable States by Heat Flux in the Hamiltonian Potts Model Journal: Physical Review Letters, Vol. 130, pp. 247102-1-247102-6, American Physical Society Year: 2023 Authors: KOBAYASHI Michikazu, Muneto Nitta Title: Proximity effects of vortices in neutron 3P2 superfluids in neutron stars: Vortex core transitions and covalent bonding of vortex molecules Journal: Phys. Rev. C, Vol. 107, pp. 045801-1-045801-15, American Physical Society Year: 2023 Authors: Mai Takahashi, KOBAYASHI Michikazu, Ikki Ohmukai Title: Characterizing playing style with speed deviation Journal: Digital Humanities, pp. 692-695, University of Tokyo Year: 2022 Authors: KOBAYASHI Michikazu, Muneto Nitta Title: Core structures of vortices in Ginzburg-Landau theory for neutron 3P2 superfluids Journal: Phsical Review C, Vol. 105, pp. 035807-1-035807-12, American Physical Society Year: 2022 Authors: KOBAYASHI Michikazu, Muneto Nitta Title: Symmetry classification of uniform states in spin-2 Bose-Einstein condensates and neutron 3P2 superfluids Journal: Physical Review A, Vol. 104, pp. 053302-1-053302-12, American Physical Society Year: 2021 Authors: Mai Takahashi, KOBAYASHI Michikazu, Ikki Ohmukai Title: Spectral analysis for idetifying octave playing piano works Journal: Proceedings of JADH conference, Vol. 2021, pp. 72-76, Japanese Association for Digital Humanities Year: 2021 Authors: KOBAYASHI Michikazu, PARNAUDEAU Philippe, LUDDENS Francky , LOTHODE Corentin, DANAILA Luminita, BRACHET Marc, DANAILA Ionut Title: Quantum turbulence simulations using the Gross–Pitaevskii equation: High-performance computing and new numerical benchmarks Journal: Computer Physics Communications, Vol. 258, No. 1, pp. 107579-1-107579-26, Elsevier Year: 2021 Authors: KOBAYASHI Michikazu, NITTA Muneto Title: Zn modified XY and Goldstone models and vortex confinement transition Journal: Physical Review D, Vol. 101, No. 1, pp. 085003-1-085003-6, Americal Physical Society Year: 2020 Authors: KOBAYASHI Michikazu, Gergely Fejos, Chandrasekhar Chatterjee, Muneto Nitta Title: Vortex confinement transitions in the modified Goldstone model Journal: Physical Review Research, Vol. 2, pp. 013081-1-013081-14, American Physical Society Year: 2020 Authors: KOBAYASHI Michikazu, Minoru Eto, Muneto Nitta Title: Berezinskii-Kosterlitz-Thouless Transition of Two-Component Bose Mixtures with Intercomponent Josephson Coupling Journal: Physical Review Letters, Vol. 123, pp. 075303-1-075303-6, American Physical Society Year: 2019 Authors: KOBAYASHI Michikazu Title: Berezinskii-Kosterlitz-Thouless transition of spin-1 spinor Bose gases in the presence of the quadratic Zeeman effect Journal: Journal of the Physical Society of Japan, Vol. 88, pp. 094001-1-094001-16, The Physical Society of Japan Year: 2019 Authors: Shigehiro Yasui, Chandrasekhar Chatterjee, KOBAYASHI Michikazu, Muneto Nitta Title: Reexamining Ginzburg-Landau theory for neutron 3P2 superfluidity in neutron stars Journal: Physical Review C, Vol. 100, pp. 025204-1-025204-15, American Physical Society Year: 2019 Authors: Hiromitsu Takeuchi, KOBAYASHI Michikazu, Kenichi Kasamatsu Title: Is a Doubly Quantized Vortex Dynamically Unstable in Uniform Superfluids? Journal: Journal of the Physical Society of Japan, Vol. 87, pp. 023601-1-023601-5, The Physical Society of Japan Year: 2018 Authors: KOBAYASHI Michikazu, Leticia F. Cugliandolo Title: Quench dynamics of the three-dimensional U(1) complex field theory: geometric and scaling characterisation of the vortex tangle Journal: Physical Review E, Vol. 94, pp. 062146-1-062146-41, American Physical Society Year: 2016 Authors: KOBAYASHI Michikazu, Leticia F. Cugliandolo Title: Thermal quenches in the stochastic Gross-Pitaevskii equation: Morphology of the vortex network Journal: Europhysics Letters, Vol. 115, pp. 20007-1-20007-6, Institute of Physics Publishing Year: 2016 Authors: Katsuhiro Nakamura, Doniyor Babajanov, Davron Matrasulov, KOBAYASHI Michikazu, Paulsamy Muruganandam Title: Dynamics of trapped interacting vortices in Bose–Einstein condensates: a role of breathing degree of freedom Journal: Journal of Physics A: Mathematical and Theoretical, Vol. 49, pp. 315102-1-315102-20, Institute of Physics Publishing Year: 2016 Authors: KOBAYASHI Michikazu, Muneto Nitta Title: Interpolating relativistic and nonrelativistic Nambu-Goldstone and Higgs modes Journal: Physical Review B, Vol. 92, pp. 045028-1-045028-10, American Physical Society Year: 2015 Authors: Daisuke A. Takahashi, KOBAYASHI Michikazu, Muneto Nitta Title: Nambu-Goldstone modes propagating along topological defects: Kelvin and ripple modes from small to large systems Journal: Physical Review B, Vol. 91, pp. 184501-1-184501-19, American Physical Society Year: 2015 Authors: KOBAYASHI Michikazu, Muneto Nitta Title: Nonrelativistic Nambu-Goldstone Modes Associated with Spontaneously Broken Space-Time and Internal Symmetries Journal: Physical Review Letters, Vol. 113, pp. 120403-1-120403-5, American Physical Society Year: 2014 Authors: KOBAYASHI Michikazu, Muneto Nitta Title: Nonrelativistic Nambu-Goldstone modes propagating along a Skyrmion line Journal: Physical Review D, Vol. 90, pp. 025010-1-025010-9, American Physical Society Year: 2014 Authors: KOBAYASHI Michikazu, Eiji Nakano, Muneto Nitta Title: Color magnetism in non-Abelian vortex matter Journal: Journal of High Energy Physics, Vol. 06, pp. 130-1-130-12, Springer Year: 2014 Authors: KOBAYASHI Michikazu, Muneto Nitta Title: Kelvin modes as Nambu–Goldstone modes along superfluid vortices and relativistic strings: Finite volume size effects Journal: Progress of Theoretical and Experimental Physics, Vol. 021B01, pp. 1-6, The Physical Society of Japan Year: 2014 Authors: KOBAYASHI Michikazu, Muneto Nitta Title: Torus knots as Hopfions Journal: Physics Letters B, Vol. 728, pp. 314-318, Elsevier Year: 2014 Authors: KOBAYASHI Michikazu, Muneto Nitta Title: Vortex Polygons and Their Stabilities in Bose-Einstein Condensates and Field Theory Journal: Journal of Low Temperature Physics, Vol. 175, pp. 208-215, Springer Year: 2013 Authors: KOBAYASHI Michikazu, Muneto Nitta Title: Winding Hopfion on R^2 x S^1 Journal: Nuclear Physics B, Vol. 876, No. 2, pp. 605-618, Elsevier Year: 2013 Authors: KOBAYASHI Michikazu, Muneto Nitta Title: Fractional vortex molecules and vortex polygons in a baby Skyrme model Journal: Physical Review D, Vol. 87, pp. 125013-1-125013-10, American Physical Society Year: 2013 Authors: KOBAYASHI Michikazu, Muneto Nitta Title: Sine-Gordon kinks on a domain wall ring Journal: Physical Review D, Vol. 87, pp. 085003-1-085003-6, American Physical Society Year: 2013 Authors: Masaya Kunimi, KOBAYASHI Michikazu, Yusuke Kato Title: Dynamics of one-dimensional supersolids Journal: Journal of Physics: Conference Series, Vol. 400, pp. 012037-1-012037-4, Institute of Physics Publishing Year: 2012 Authors: Katsuhiro Nakamura, Doniyor Babajanov, Davron Matrasulov, KOBAYASHI Michikazu Title: Dynamics of inertial vortices in multicomponent Bose-Einstein condensates Journal: Physical Review A, Vol. 86, pp. 053613-1-053613-8, American Physical Society Year: 2012 Authors: Makoto Tsubota, KOBAYASHI Michikazu, Hiromitsu Takeuchi Title: Quantum hydrodynamics Journal: Physics Reports, Vol. 522, pp. 191-238, Elsevier Year: 2012 Authors: Shingo Kobayashi, KOBAYASHI Michikazu, Yuki Kawaguchi, Muneto Nitta, Masahito Ueda Title: Abe homotopy classification of topological excitations under the topological influence of vortices Journal: Nuclear Physics B, Vol. 856, No. 2, pp. 577-606, Elsevier Year: 2012 Authors: Jourge A. Seman, Emanual A. L. Henn, Rodrigo Figueiredo Shiozaki, Giacomo Roati, Freddy Jackson Poveda-Cuevas, Kilvia M. F. Magalhaes, Vyacheslav I. Yukalov, Makoto Tsubota, KOBAYASHI Michikazu, Kenichi Kasamatsu, Vanderlei Salvador Bagnato Title: Route to turbulence in a trapped Bose-Einstein condensate Journal: Laser Physics Letters, Vol. 8, pp. 691-696, Institute of Physics Publishing Year: 2011 Authors: KOBAYASHI Michikazu Title: Physics of non-Abelian vortices in Bose-Einstein condensates Journal: Journal of Physics: Conference Series, Vol. 297, pp. 012013-1-012013-17, Institute of Physics Publishing Year: 2011 Authors: Shun Uchino, KOBAYASHI Michikazu, Muneto Nitta, Masahito Ueda Title: Quasi-Nambu-Goldstone Modes in Bose-Einstein Condensates Journal: Physical Review Letters, Vol. 105, pp. 230406-1-230406-4, American Physical Society Year: 2010 Authors: KOBAYASHI Michikazu, Yuki Kawaguchi, Muneto Nitta, Masahito Ueda Title: Collision Dynamics of Non-Abelian Vortices in Spinor Bose-Einstein Condensates Journal: Journal of Low Temperature Physics, Vol. 162, pp. 299-306, Springer Year: 2010 Authors: Yasunari Kurita, KOBAYASHI Michikazu, Hideki Ishihara, Makoto Tsubota Title: Particle creation in Bose-Einstein condensates: Theoretical formulation based on conserving gapless mean-field theory Journal: Physical Review A, Vol. 82, pp. 053602-1-053602-8, American Physical Society Year: 2010 Authors: Yuki Kawaguchi, KOBAYASHI Michikazu, Muneto Nitta, Masahito Ueda Title: Topological Excitations in Spinor Bose-Einstein Condensates Journal: Progress of Theoretical Physics, Vol. 186, pp. 455-462, The Physical Society of Japan Year: 2010 Authors: Shun Uchino, KOBAYASHI Michikazu, Masahito Ueda Title: Bogoliubov theory and Lee-Huang-Yang corrections in spin-1 and spin-2 Bose-Einstein condensates in the presence of the quadratic Zeeman effect Journal: Physical Review A, Vol. 81, pp. 063632-1-063632-29, American Physical Society Year: 2010 Authors: Jukka Huhtamaki, Tapio Simula, KOBAYASHI Michikazu, Kazughige Machida Title: Stable fractional vortices in the cyclic states of Bose-Einstein condensates Journal: Physical Review A, Vol. 80, pp. 051601(R)-1-051601(R)-4, American Physical Society Year: 2009 Authors: KOBAYASHI Michikazu, Yuki Kawaguchi, Muneto Nitta, Masahito Ueda Title: Collision Dynamics and Rung Formation of non-Abelian Vortices Journal: Physical Review Letters, Vol. 103, pp. 115301-1-115301-4, American Physical Society Year: 2009 Authors: Yasunari Kurita, KOBAYASHI Michikazu, Takao Morinari, Makoto Tsubota, Hideki Ishihara Title: Spacetime analog of Bose-Einstein condensates: Bogoliubov–de Gennes formulation Journal: Physical Review A, Vol. 79, pp. 043616-1-043616-8, American Physical Society Year: 2009 Authors: KOBAYASHI Michikazu, Yasunari Kurita, Takao Morinari, Makoto Tsubota, Hideki Ishihara Title: Particle creation in bose-einstein condensates: Numerical analysis of the Bogoliubov–de Gennes equation for trapped ultracold atoms Journal: Journal of Physics: Conference Series, Vol. 150, pp. 032044-1-032044-4, Institute of Physics Publishing Year: 2009 Authors: Makoto Tsubota, KOBAYASHI Michikazu Title: Quantum Turbulence in Trapped Atomic Bose-Einstein Condensates Journal: Journal of Low Temperature Physics, Vol. 150, pp. 402-409, Springer Year: 2007 Authors: KOBAYASHI Michikazu, Makoto Tsubota Title: Quantum Turbulence in a Trapped Bose-Einstein Condensate under Combined Rotations around Three Axes Journal: Journal of Low Temperature Physics, Vol. 150, pp. 587-592, Springer Year: 2007 Authors: KOBAYASHI Michikazu, Makoto Tsubota Title: Quantum turbulence in a trapped Bose-Einstein condensate Journal: Physical Review A, Vol. 76, pp. 045603-1-045603-4, American Physical Society Year: 2007 Authors: KOBAYASHI Michikazu, Makoto Tsubota Title: Dissipation of Gross-Pitaevskii Turbulence Coupled with Thermal Excitations Journal: Journal of Low Temperature Physics, Vol. 148, pp. 275-279, Springer Year: 2007 Authors: KOBAYASHI Michikazu, Makoto Tsubota Title: Localization of Bose‐Einstein Condensate and Disappearance of Superfluidity of Strongly Correlated Bose Fluid in a Confined Potential Journal: AIP Conference Proceedings, Vol. 850, pp. 287-288, Americal Institute of Physics Year: 2006 Authors: Makoto Tsubota, KOBAYASHI Michikazu Title: Inertial Range and the Kolmogorov Spectrum of Quantum Turbulence Journal: AIP Conference Proceedings, Vol. 850, pp. 219-220, Americal Institute of Physics Year: 2006 Authors: KOBAYASHI Michikazu, Makoto Tsubota Title: Decay of Quantized Vortices in Quantum Turbulence Journal: Journal of Low Temperature Physics, Vol. 145, pp. 209-218, Springer Year: 2006 Authors: KOBAYASHI Michikazu, Makoto Tsubota Title: Thermal Dissipation in Quantum Turbulence Journal: Physical Review Letters, Vol. 97, pp. 145301-1-145301-4, American Physical Society Year: 2006 Authors: KOBAYASHI Michikazu, Makoto Tsubota Title: Kolmogorov Spectrum of Quantum Turbulence Journal: Journal of the Physical Society of Japan, Vol. 74, pp. 3248-3258, The Physical Society of Japan Year: 2005 Authors: Makoto Tsubota, KOBAYASHI Michikazu Title: Kolmogorov spectrum of the Gross–Pitaevskii turbulence Journal: Journal of Physics and Chemistry of Solids, Vol. 66, pp. 1498-1500, Elsevier Year: 2005 Authors: KOBAYASHI Michikazu, Makoto Tsubota Title: Kolmogorov Spectrum of Superfluid Turbulence: Numerical Analysis of the Gross-Pitaevskii Equation with a Small-Scale Dissipation Journal: Physical Review Letters, Vol. 94, pp. 065302-1-065302-4, American Physical Society Year: 2005 Authors: KOBAYASHI Michikazu, Makoto Tsubota Title: Bose-Einstein Condensation and Superfluidity of Strongly Correlated Bose Fluid in a Random Potential Journal: Journal of Low Temperature Physics, Vol. 138, pp. 189-194, Springer Year: 2005 Authors: KOBAYASHI Michikazu, Makoto Tsubota Title: Energy spectrum of superfluid turbulence: Numerical analysis of the Gross-Pitaevskii equation with the small scale dissipation Journal: Bussei Kenkyu, Vol. 84, No. 3, pp. 457-458, 京都大学基礎物理学研究所 Year: 2005 Authors: KOBAYASHI Michikazu, Makoto Tsubota Title: Superfluid-Insulator Transition of a Bose-Einstein Condensation in a Periodic Potential and its Interference Pattern Journal: Journal of Low Temperature Physics, Vol. 134, pp. 665-670, Springer Year: 2004 Authors: KOBAYASHI Michikazu, Makoto Tsubota Title: Bose-Einstein condensation and superfluidity of dirty Bose gas Journal: Physica B, Vol. 329-333, No. 1, pp. 212-213, Elsevier Year: 2003 Authors: KOBAYASHI Michikazu, Makoto Tsubota, Takeshi Iida Title: Superfluidity of disordered Bose system: numerical analysis of the Gross-Pitaevskii equation with random potential Journal: Physica B, Vol. 329-333, No. 1, pp. 210-211, Elsevier Year: 2003 Authors: KOBAYASHI Michikazu, Makoto Tsubota Title: Bose-Einstein condensation and superfluidity of a dilute Bose gas in a random potential Journal: Physical Review B, Vol. 66, pp. 174516-1-174516-7, American Physical Society Year: 2002
Keynote lectures	Breakdown of local equilibrium thermodynamics for phase coexistence in heat conduction, 28th IUPAP International conference on Statistical Physics, University of Tokyo, 2023 Time arrow in reconnecting dynamics of vortices, Bridging Classical and Quantum Turbulence, Research Institute Scientists, Cargese, Corsica, France, 2023 Machine-learning approach for detecting Kosterlitz-Thouless transition in the Gross-Pitaevskii and continuous clock models, Conference "Mathematical Structures in Quantum Fluids", Osaka Metropolitan University, Building E of Faculty of Science, 2023 Massive quasi-Nambu Goldstone mode and stabilization of quantized vortices in spinor Bose-Einstein condensates at finite temperatures, 2022 Ginzburg-Landau analysis for vortex-core-structure in neutron ^3^P_2_ superfluids inside neutron stars, The Physical Society of Japan 2021 Autumn Meeting, Online, 2021 Analysis of heat conducting systems with a interface of the 1st ordered transition with the Hamilton-Potts model, The Physical Society of Japan 2021 Annual Meeting, Online, 2021 Dual cascade of energy and helicity accompanying mass and spin in non-Abelian quantum turbulence of spinor Bose-Einstein condensates, Space-time topology behind formation of micro-macro magneto-vortical structure manifested by Nambu mechanics, Osaka City University, 2020
Invited lectures	Numerical approach with FreeFEM for Zn modified Goldstone models, Modelling and Numerics, application to quantum fluids and related system, Waseda University, 2023 Phase coexisting heat conduction in the Hamilton Potts model, Japan-France joint seminar "Physics of dense and active disordred materials", Kyoto University, 2023 Violation of local equilibrium thermodynamics in phase coexistence under heat conduction, KUT Workshop 2022, "Nonequilibrium Statistical Physics of Cooperative Systems", Kochi University of Technology, 2022 Time arrow in quantized vortex dynamics, 2022
Grants-in-Aid for Scientific Research from the Japanese government	Project title: Search for novel non-equilibrium phase transitions dominated by topological defects Category: Grant-in-Aid for Scientific Research (C) Project number: 20K03765 Project period: 2020-2024 Total budget amount: 4,550,000 yen Keywords:

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