Matsuura, So



Faculty of Business and Commerce (Hiyoshi)



Profile Summary 【 Display / hide

  • 自然界の最も基本的な構成要素「素粒子」の振る舞いは,現在のところ,標準模型と呼ばれる理論でうまく説明出来ています。しかし,観測技術が向上し,より高いエネルギー領域を見ることが出来るようになるにつれ,将来的には,より根源的な原理に支配された新しい素粒子理論が必要になると信じられています。私は超対称性と呼ばれる原理に基づいた素粒子理論を研究しています。超対称性は,「時空が平坦である」という性質を自然に拡張した概念で,高エネルギー領域では特に重要な役割を果たすと考えられています。実際,現在ジュネーブのCERNで行なわれている大型加速器による実験で宇宙が超対称性を持っている証拠が見つかるかも知れません。私は現在,超対称性を持った理論をコンピュータ・シミュレーションで調べる研究を行なっています。また同時に,超弦理論と呼ばれる更に大きな枠組みを持った理論を用いて,超対称性を持った理論の性質を調べる研究も行なっています。

Academic Background 【 Display / hide

  • 2000.03

    Kyoto University, Graduate School, Division of Natural Science, division of physics and astronomy

    Graduate School, Completed, Master's course

  • 2003.03

    Kyoto University, Graduate School, Division of Natural Science, division of physics and astronomy

    Graduate School, Completed, Doctoral course

Academic Degrees 【 Display / hide

  • Science, Kyoto University, Coursework, 2003.03


Research Areas 【 Display / hide

  • Natural Science / Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics (Elementary Particle/Atomic Nucleus/Cosmic Ray/Space Physics)

Research Keywords 【 Display / hide

  • elementary particle

  • supersymmetry

  • superstring


Papers 【 Display / hide

  • ローレンツ力に関する学生実験について


    慶應義塾大学日吉紀要. 自然科学 51   9-21 2012.03

    Research paper (bulletin of university, research institution), Joint Work

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    We present a realization of the experiment on the Lorentz force that is appropriate for undergraduate students. We formulate the experiment so that the meaning is clear even for the students in humanities and social sciences. In particular, the neodymium magnet is introduced insted of a coil to generate the magnetic field. In addition, the Lorentz force is measured as the force on the electric current by the magnetic field. We also introduce an experiment on the electric field by using conductive papers and that on the Ampère's law by using a Tesla meter.

  • Two-dimensional lattice for four-dimensional N=4 supersymmetric Yang-Mills.

    MANADA Masanori, MATSUURA So, SUGINO Fumihiko

    Progress of Theoretical Physics 126   597-611 2011

    Research paper (scientific journal), Joint Work, Accepted

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    We construct a lattice formulation of a mass-deformed two-dimensional N=(8,8) super Yang-Mills theory with preserving two supercharges exactly. Gauge fields are represented by compact unitary link variables, and the exact supercharges on the lattice are nilpotent up to gauge transformations and SU(2)_R rotations. Due to the mass deformation, the lattice model is free from the vacuum degeneracy problem, which was encountered in earlier approaches, and flat directions of scalar fields are stabilized giving discrete minima representing fuzzy S^2. Around the trivial minimum, quantum continuum theory is obtained with no tuning, which serves a nonperturbative construction of the IIA matrix string theory. Moreover, around the minimum of k-coincident fuzzy spheres, four-dimensional N=4 U(k) super Yang-Mills theory with two commutative and two noncommutative directions emerges. In this theory, sixteen supersymmetries are broken by the mass deformation to two. Assuming the breaking is soft, we give a scenario leading to undeformed N=4 super Yang-Mills on R^4 without any fine tuning. As an evidence for the validity of the assumption, some computation of 1-loop radiative corrections is presented.

  • Nonperturbative studies of supersymmetric matrix quantum mechanics with 4 and 8 supercharges at finite temperature.

    Masanori Hanada, So Matsuura, Jun Nishimura, Daniel Robles-Llana

    Journal of High Energy Physics 1102   060 2011

    Research paper (scientific journal), Single Work, Accepted

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    We investigate thermodynamic properties of one-dimensional U(N) supersymmetric gauge theories with 4 and 8 supercharges in the planar large-N limit by Monte Carlo calculations. Unlike the 16 supercharge case, the threshold bound state with zero energy is widely believed not to exist in these models. This led A.V. Smilga to conjecture that the internal energy decreases exponentially at low temperature instead of decreasing with a power law. In the 16 supercharge case, the latter behavior was predicted from the dual black 0-brane geometry and confirmed recently by Monte Carlo calculations. Our results for the models with 4 and 8 supercharges indeed support the exponential behavior, revealing a qualitative difference from the 16 supercharge case.

  • Recent progress of lattice and non-lattice super Yang-Mills.

    Masanori Hanada, Issaku Kanamori, So Matsuura, Fumihiko Sugino.

    Lattice 2011  2011

    Research paper (conference, symposium, etc.), Joint Work

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    We report recent progress of non-perturbative formulation of supersymmetric Yang-Mills. Although lattice formulations of two-dimensional theories which are fine tuning free to all order in perturbation theory are known for almost ten years, however, there were only few evidence for the validity at non-perturbative level. In this talk we argue that most numerical studies so far do not capture the physics in continuum, and add new evidence that lattice formulation works at non-perturbatively. We further point out that, by combining two-dimensional lattice and matrix model techniques inspired by D-brane dynamics in superstring theory, a non-perturbative formulation of the four-dimensional maximally supersymmetric Yang-Mills theory, which is free from the fine tuning at least to all order in perturbation theory, is obtained.

  • Instanton Counting and Dielectric Branes


    Journal of High Energy Physics 08 ( 09 ) 083 2008

    Research paper (scientific journal), Single Work, Accepted

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    We consider the Hanany-Witten type brane configuration in a background of RR 4-form field strength and examine the behavior of Euclidean D0-branes propagating between two NS5-branes. We evaluate the partition function of the D0-branes and show that it coincides with the Nekrasov partition function of instantons for four-dimensional N=2 supersymmetric Yang-Mills theory. In this analysis, the Myers effect plays a crucial role. We apply the same method to the brane configuration realizing four-dimensional N=2 theory with hypermultiplets in the fundamental representation and reproduce the corresponding Nekrasov partition function.

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

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Presentations 【 Display / hide

  • 2次元N=(8,8)超対称ヤン・ミルズ理論の数値シミュレーションに関する報告

    MATSUURA So, HANADA Masanori

    日本物理学会第67回年次大会 (関西学院大学) , 


    Oral presentation (general), 日本物理学会

  • 行列正則化した4次元N=4超対称ヤン・ミルズ理論の量子補正について

    HANADA Masanori, MATSUURA So, SUGINO Fumihiko, SUZUKI Hiroshi

    日本物理学会2011年秋季大会 (弘前大学) , 


    Oral presentation (general), 日本物理学会

  • Two-dimensional lattice for four-dimensional N=4 supersymmetric Yang-Mills


    場の理論と超弦理論の最先端 (京都大学 基礎物理学研究所) , 


    Oral presentation (general)

  • Two-dimensional lattice for four-dimensional N=4 supersymmetric Yang-Mills

    MATSUURA So, HANADA Masanori, SUGINO Fumihiko

    日本物理学会2010年秋季大会 (九州工業大学) , 


    Oral presentation (general), 日本物理学会

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

  • 離散化した超対称ゲージ理論に基づく量子重力の探求


    MEXT,JSPS, Grant-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Principal investigator

  • 離散的手法と数値計算に基づく超対称ゲージ理論の非摂動的探求


    MEXT,JSPS, Grant-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Principal investigator


Courses Taught 【 Display / hide











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