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Researcher Information

last modified:2024/07/16

Assistant Professor MARUYAMA, Shuhei

Faculty, Affiliation

Faculty of Mathematics and Physics, Institute of Science and Engineering

College and School Educational Field

Division of Mathematical and Physical Science, Graduate School of Natural Science and Technology
Course in Mathematics, School of Mathematics and Physics, College of Science and Engineering


Academic Background


Japan Society for the Promotion of Science(2021/04-2021/09)
Japan Society for the Promotion of Science(2021/10-2023/03)
Japan Society for the Promotion of Science(2023/04-2023/09)
Kanazawa University(2023/10-)

Year & Month of Birth

Academic Society




Speciality Keywords

geometric topology, geometric group theory

Research Themes

Groups of diffeomorphisms and their cohomology



  •  The Flux Homomorphism on a Surface with Boundary and Central Extensions of Diffeomorphism Groups Shuhei MARUYAMA Tokyo Journal of Mathematics 45 2 2022/12/01
  •  The translation number and quasi-morphisms on groups of symplectomorphisms of the disk Shuhei Maruyama Annales de l'Institut Fourier 72 5 1819 2022/09/12 
  •  A note on stable commutator length in braided Ptolemy-Thompson groups Shuhei Maruyama Kodai Mathematical Journal 44 2 2021/06/30
  •  Extensions of quasi-morphisms to the symplectomorphism group of the disk Shuhei Maruyama Topology and its Applications 305 107880 2022/01
  •  Mixed commutator lengths, wreath products and general ranks Morimichi Kawasaki,Mitsuaki Kimura,Shuhei Maruyama,Takahiro Matsushita,Masato Mimura Kodai Mathematical Journal 46 2 2023/06/30

show all

  •  The Dixmier-Douady classes and abelian extensions of groups of homeomorphisms Shuhei Maruyama Topology and its Applications 336 108600 2023/08
  •  The flux homomorphism and central extensions of diffeomorphism groups Shuhei Maruyama Osaka Journal of Mathematics 58 2 319 2021/04

Conference Presentations

  • On the boundedness of characteristic classes for foliated symplectic and contact fibrations(2023/09/05)
  • Non-extendable invariant quasimorphisms for groups acting on the circle(conference:Workshop on Orderings and Groups)(2023/06/13)
  • A characteristic class of Hamiltonian fibrations and a group cocycle(conference:Stanford Symplectic Geometry Seminar)(2020/11/16)


Arts and Fieldwork


Theme to the desired joint research


Grant-in-Aid for Scientific Research

Competitive research funding,Contribution

Collaborative research,Consignment study

Classes (Bachelors)

Classes (Graduate Schools)

International Project

International Students

Lecture themes

Others (Social Activities)

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