Updated on 2025/04/24

写真a

 
Junichi Sakamoto
 
Organization
Graduate School of Engineering Department of Advanced Science and Technology Materials Science and Engineering Mathematical Physics Laboratory Post Doctoral Fellow   
Degree
Ph.D. ( 2019.3   Kyoto University )

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

Main research papers

  • Generalized type IIB supergravity equations and non-Abelian classical r-matrices

    Domenico Orlando*, Susanne Reffert*, Jun-ichi Sakamoto, Kentaroh Yoshida*

    Journal of Physics A: Mathematical and Theoretical   49 ( 44 )   445403   2016.10.13

    Weyl invariance of string theories in generalized supergravity backgrounds

    José J. Fernández-Melgarejo*, Jun-Ichi Sakamoto, Yuho Sakatani*, Kentaroh Yoshida*

    Physical Review Letters   122 ( 11 )   111602   2019.3.22

    Yang-Baxter σ σ-models, conformal twists, and noncommutative Yang-Mills theory

    T. Araujo*, I. Bakhmatov*, E. Ó Colgáin*, J. Sakamoto, M.M. Sheikh-Jabbari*, K. Yoshida*

    Physical Review D   95 ( 10 )   105006   2017.5.26

Research History

  • Toyota Technological Institute   Post Doctoral Fellow

    2024.10

  • Istituto Nazionale di Fisica Nucleare (INFN)   Post Doctoral Fellow

    2022.9 - 2024.9

  • 国立台湾大学   ポストドクトラル研究員

    2019.8 - 2022.8

  • 京都大学基礎物理学研究所   ポストドクトラル研究員

    2019.4 - 2019.7

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Education

  • Kyoto University

    2016.4 - 2019.3

  • Kyoto University

    2014.4 - 2016.3

  • Osaka City University

    2010.4 - 2014.3

Professional Memberships

  • 日本物理学会

Research theme

  • ブラックホールの厳密解構成に向けた解生成技法の開発とその応用

    坂本 純一, 富沢 真也

    2024

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    純粋なアインシュタイン重力理論および超重力理論における厳密解の探索は、アインシュタイン方程式の数学的な構造や時空の幾何学的性質を深く理解する上で、極めて重要な意義を持つ。アインシュタイン方程式は非線形な連立偏微分方程式であり、その厳密解の構成は一般には非常に困難である。
    しかしながら、D次元重力理論において (D-2)個の可換なKilling対称性を仮定することで、アインシュタイン方程式は二次元の可積分な場の理論の運動方程式へと簡約される。この可積分構造を活用することで、逆散乱法をはじめとした可積分系に由来する多様な解生成手法が適用可能となり、超対称性をもたない漸近的に平坦なブラックホール解を含む、多くの厳密解の構成が実現されてきた。

    本研究の目的は、こうした可積分系に基づいた従来の手法をさらに拡張および発展させることにより、新たな超対称性を持たない漸近的に平坦なブラックホール解や、漸近的にAdS時空に近づく重力解の構成を目指すことである。とくに後者については、AdS/CFT対応への応用が期待されており、本研究で構成される漸近AdSなブラックホール解の物理的性質を対応する共形場理論(CFT)の視点から解析可能になる。なかでも、超対称をもたない漸近AdSなブラックホール解は現時点ではほとんど知られておらず、そのようなブラックホール解の構成に向けた本研究は、ブラックホールの動力学や熱力学のより深い理解を導くことが期待される。

    Outcome:

    2024
    2024年度は、漸近的にAdS時空へと近づくブラックホール解の構成を目指し、従来の可積分系を用いた重力解の構成手法の拡張に取り組んだ。
    その結果、最近発見された複数のBTZブラックホールが3次元球面上に局在し、超対称をもたない漸近的AdSなブラックホール解を、可積分系に基づく手法によって構成することに成功した。
    この研究成果は、「漸近平坦ブラックホールからのAdSブラックホール解の生成手法」というタイトルで、日本物理学会2025年春季大会にて発表を行った。
    現在、上記の成果を本学所属の富沢真也氏との共著論文として執筆中であり、近日中にarXivへの投稿を予定している。

Papers

  • Non-Abelian Toda field theories from a 4D Chern-Simons theory Reviewed

    Osamu Fukushima*, Jun-ichi Sakamoto, Kentaroh Yoshida*

    Journal of High Energy Physics   2022 ( 03 )   158   2022.3

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/JHEP03(2022)158

  • Integrable deformed T^{1,1} sigma models from 4D Chern-Simons theory Reviewed

    Osamu Fukushima*, Jun-ichi Sakamoto, Kentaroh Yoshida*

    Journal of High Energy Physics   2021 ( 09 )   37   2021.9

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/JHEP09(2021)037

  • Faddeev-Reshetikhin model from a 4D Chern-Simons theory Reviewed

    Osamu Fukushima*, Jun-ichi Sakamoto, Kentaroh Yoshida*

    Journal of High Energy Physics   2021 ( 115 )   2021.2

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/JHEP02(2021)115

  • Yang–Baxter deformations and generalized supergravity—a short summary Reviewed

    Domenico Orlando*, Susanne Reffert*, Jun-ichi Sakamoto, Yuta Sekiguchi*, Kentaroh Yoshida*

    Journal of Physics A: Mathematical and Theoretical   53 ( 44 )   2020.10

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1088/1751-8121/abb510

  • Yang-Baxter deformations of the AdS_5×S^5 supercoset sigma model from 4D Chern-Simons theory Reviewed

    Osamu Fukushima*, Jun-ichi Sakamoto, Kentaroh Yoshida*

    Journal of High Energy Physics   2020 ( 09 )   100   2020.9

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/JHEP09(2020)100

  • Comments on η η-deformed principal chiral model from 4D Chern-Simons theory Reviewed

    Osamu Fukushima*, Jun-ichi Sakamoto, Kentaroh Yoshida*

    Nuclear Physics B   957 ( 115080 )   2020.8

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.nuclphysb.2020.115080

  • Superconformal Block from Holographic Geometry Reviewed

    Heng-Yu Chen*, Jun-ichi Sakamoto

    Journal of High Energy Physics   2020 ( 07 )   28   2020.7

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/JHEP07(2020)028

  • Gravitational perturbations as T \bar{T}-deformations in 2D dilaton gravity systems Reviewed

    Takaaki Ishii*, Suguru Okumura*, Jun-Ichi Sakamoto, Kentaroh Yoshida*

    Nuclear Physics B   951 ( 114901 )   2020.2

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.nuclphysb.2019.114901

  • Weyl invariance of string theories in generalized supergravity backgrounds Reviewed

    José J. Fernández-Melgarejo*, Jun-Ichi Sakamoto, Yuho Sakatani*, Kentaroh Yoshida*

    Physical Review Letters   122 ( 11 )   111602   2019.3

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1103/PhysRevLett.122.111602

  • Local β-deformations and Yang-Baxter sigma model Reviewed

    Jun-ichi Sakamoto, Yuho Sakatani*

    Journal of High Energy Physics   2018 ( 06 )   147   2018.6

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/JHEP06(2018)147

  • Conformal twists, Yang–Baxter σ-models & holographic noncommutativity Reviewed

    Thiago Araujo*, Ilya Bakhmatov*, Eoin Ó Colgáin*, Jun-ichi Sakamoto, Mohammad M. Sheikh-Jabbari*, Kentaroh Yoshida*

    Journal of Physics A: Mathematical and Theoretical   51 ( 23 )   2018.5

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1088/1751-8121/aac195

  • T-folds from Yang-Baxter deformations Reviewed

    Jose J. Fernandez-Melgarejo*, Jun-ichi Sakamoto, Yuho Sakatani*, Kentaroh Yoshida*

    Journal of High Energy Physics   2017 ( 12 )   108   2017.12

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/JHEP12(2017)108

  • I in generalized supergravity Reviewed

    T. Araujo*, E. Ó Colgáin*, J. Sakamoto, M.M. Sheikh-Jabbari*, K. Yoshida*

    The European Physical Journal C   77 ( 11 )   739   2017.11

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1140/epjc/s10052-017-5316-5

  • Homogeneous Yang-Baxter deformations as generalized diffeomorphisms Reviewed

    Jun-ichi Sakamoto, Yuho Sakatani*, Kentaroh Yoshida*

    Journal of Physics A: Mathematical and Theoretical   50 ( 41 )   415401   2017.9

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1088/1751-8121/aa8896

  • Yang-Baxter deformations of W ^{2,4} ×T^{1,1} and the associated T-dual models Reviewed

    Jun-ichi Sakamoto, Kentaroh Yoshida*

    Nuclear Physics B   921   805 - 828   2017.8

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.nuclphysb.2017.06.017

  • Weyl invariance for generalized supergravity backgrounds from the doubled formalism Reviewed

    Jun-ichi Sakamoto, Yuho Sakatani*, Kentaroh Yoshida*

    Progress of Theoretical and Experimental Physics   2017 ( 5 )   053B07   2017.5

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1093/ptep/ptx067

  • Yang-Baxter σ-models, conformal twists, and noncommutative Yang-Mills theory Reviewed

    T. Araujo*, I. Bakhmatov*, E. Ó Colgáin*, J. Sakamoto, M.M. Sheikh-Jabbari*, K. Yoshida*

    Physical Review D   95 ( 10 )   105006   2017.5

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1103/PhysRevD.95.105006

  • Generalized type IIB supergravity equations and non-Abelian classical r-matrices Reviewed

    Domenico Orlando*, Susanne Reffert*, Jun-ichi Sakamoto, Kentaroh Yoshida*

    Journal of Physics A: Mathematical and Theoretical   49 ( 44 )   445403   2016.10

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1088/1751-8113/49/44/445403

  • Yang-Baxter sigma models and Lax pairs arising from κ-Poincaré r-matrices Reviewed

    Andrzej Borowiec*, Hideki Kyono*, Jerzy Lukierski*, Jun-ichi Sakamoto, Kentaroh Yoshida*

    Journal of High Energy Physics   2016 ( 04 )   079   2016.4

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/JHEP04(2016)079

  • Lax pairs for deformed Minkowski spacetimes Reviewed

    Hideki Kyono*, Jun-ichi Sakamoto, Kentaroh Yoshida*

    Journal of High Energy Physics   2016 ( 01 )   143   2016.1

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/JHEP01(2016)143

  • Lax pairs on Yang-Baxter deformed backgrounds Reviewed

    Takashi Kameyama*, Hideki Kyono*, Jun-ichi Sakamoto, Kentaroh Yoshida*

    Journal of High Energy Physics   2016 ( 11 )   043   2015.11

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/JHEP11(2015)043

  • Yang-Baxter deformations of Minkowski spacetime Reviewed

    Takuya Matsumoto*, Domenico Orlando*, Susanne Reffert*, Jun-ichi Sakamoto, Kentaroh Yoshida*

    Journal of High Energy Physics   2015 ( 10 )   185   2015.10

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/JHEP10(2015)185

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