Updated on 2022/03/24

写真a

 
SUGISHITA Sotaro
 
Organization
Institute for Advanced Research Designated assistant professor
Graduate School of Science Designated assistant professor
Title
Designated assistant professor

Degree 1

  1. 博士(理学) ( 2016.3   京都大学 ) 

Research Areas 1

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

 

Papers 2

  1. Target space entanglement in quantum mechanics of fermions and matrices Reviewed International journal

    Sotaro Sugishita

    Journal of High Energy Physics   Vol. 2021 ( 8 )   2021.8

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

    DOI: 10.1007/JHEP08(2021)046

    Web of Science

    Scopus

  2. IR finite S-matrix by gauge invariant dressed states Reviewed International journal

    Hayato Hirai, Sotaro Sugishita

    Journal of High Energy Physics   Vol. 2021 ( 2 )   2021.2

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

    <title>A<sc>bstract</sc>
    </title>Dressed states were proposed to define the infrared (IR) finite <italic>S</italic>-matrix in QED or gravity. We show that the original Kulish-Faddeev dressed states are not enough to cure the IR divergences. To illustrate this problem, we consider QED with background currents (Wilson lines). This theory is exactly solvable but shares the same IR problems as the full QED. We show that naive asymptotic states lead to IR divergences in the <italic>S</italic>-matrix and are also inconsistent with the asymptotic symmetry, even if we add the original Kulish-Faddeev dressing operators. We then propose new dressed states which are consistent with the asymptotic symmetry. We show that the <italic>S</italic>-matrix for the dressed states is IR finite. We finally conclude that appropriate dressed asymptotic states define the IR finite <italic>S</italic>-matrix in the full QED.

    DOI: 10.1007/JHEP02(2021)025

    Other Link: http://link.springer.com/article/10.1007/JHEP02(2021)025/fulltext.html

MISC 1

  1. Target Space Entanglement in Quantum Mechanics of Fermions and Matrices Reviewed

    Sotaro Sugishita

        2022.2

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    Authorship:Lead author, Last author, Corresponding author   Language:English   Publishing type:Article, review, commentary, editorial, etc. (international conference proceedings)  

Presentations 12

  1. QEDでの散乱におけるデコヒーレンス問題と漸近対称性

    杉下宗太郎, 平井隼人

    日本物理学会第77回年次大会  2022.3.17 

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    Event date: 2022.3

    Language:Japanese   Presentation type:Oral presentation (general)  

  2. QEDにおけるゲージ不変なドレス化散乱状態を用いた赤外有限S行列

    平井隼人, 杉下宗太郎

    日本物理学会第77回年次大会  2022.3.17 

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    Event date: 2022.3

    Language:Japanese   Presentation type:Oral presentation (general)  

  3. Target space entanglement in quantum mechanics of fermions and matrices Invited

    2021.12.22 

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    Event date: 2021.12

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

  4. Target space entanglement in quantum mechanics of fermions and matrices International conference

    Sotaro Sugishita

    KIAS-YITP Joint Workshop 2021 String Theory and Quantum Gravity  2021.12.13 

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    Event date: 2021.12

    Language:English   Presentation type:Oral presentation (general)  

  5. Gauge invariant dressed S-matrix and decoherence problem in QED International conference

    Yukawa institute seminar  2021.12.10 

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    Event date: 2021.12

    Language:English   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

  6. Target space entanglement in quantum mechanics of fermions and matrices International conference

    Sotaro Sugishita

    East Asia Joint Symposium on Fields and Strings 2021  2021.11.26 

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    Event date: 2021.11

    Language:English   Presentation type:Oral presentation (general)  

  7. Target space entanglement in quantum mechanics of fermions and matrices Invited International conference

    Sotaro Sugishita

    KEK Theory Seminar  2021.10.20 

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    Event date: 2021.10

    Language:English   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

  8. Target space entanglement in quantum mechanics of fermions and matrices

    2021.9.15 

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    Event date: 2021.9

    Presentation type:Oral presentation (general)  

  9. Target space entanglement in quantum mechanics of fermions and matrices International conference

    Sotaro Sugishita

    YITP workshop Strings and Fields 2021  2021.8.25 

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    Event date: 2021.8

    Language:English   Presentation type:Oral presentation (general)  

  10. Target space entanglement in quantum mechanics of fermions and matrices Invited

    2021.7.27 

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    Event date: 2021.7

    Language:Japanese   Presentation type:Public lecture, seminar, tutorial, course, or other speech  

  11. IR finite S-matrix by gauge invariant dressed states Invited

    2021.4.20 

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    Event date: 2021.4

    Presentation type:Public lecture, seminar, tutorial, course, or other speech  

  12. IR finite S-matrix by gauge invariant dressed states Invited

    2021.4.13 

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    Event date: 2021.4

    Presentation type:Public lecture, seminar, tutorial, course, or other speech  

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KAKENHI (Grants-in-Aid for Scientific Research) 1

  1. 重力理論の漸近対称性と平坦時空のホログラフィー

    Grant number:21K13927  2021.4 - 2026.3

    日本学術振興会  科学研究費助成事業 若手研究  若手研究

    杉下 宗太郎

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    Authorship:Principal investigator 

    Grant amount:\4550000 ( Direct Cost: \3500000 、 Indirect Cost:\1050000 )

    量子重力理論の定式化は理論物理学における積年の課題である。量子重力理論定式化の鍵となると思われる概念にホログラフィーというものがある。これは「重力理論の自由度をホログラムのように低次元に埋め込むことができる」という考え方である。
    <BR>
    本研究では、漸近的に平坦な時空における重力理論のホログラフィーについて、主に漸近対称性と呼ばれる対称性に基いて、考察を行う。また、場の量子論・重力理論における漸近対称性の一般的性質に関する研究も行い、その意味や役割についての知見を深める。