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Researcher Information

last modified:2024/06/06

Assistant Professor SAIKAWA, Kenichi

Laboratory Website

Faculty, Affiliation

Faculty of Mathematics and Physics, Institute of Science and Engineering
Assistant Professor

College and School Educational Field

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


Institute of Theoretical Physics

Academic Background

【Academic background(Doctoral/Master's Degree)】
The University of Tokyo Doctor Graduate School of Science Department of Physics 201303 Completed
The University of Tokyo Master Graduate School of Science Department of Physics 201003 Completed
【Academic background(Bachelor's Degree)】
The University of Tokyo Department of Physics 200803
Ph.D. of Science


Kanazawa University School of Mathematics and Physics Assistant Professor(2019/11/01-)
Max-Planck-Institute for Physics (Werner-Heisenberg-Institut) Theory Group Postdoc fellow(2017/10/01-2019/10/31)
Deutsches Elektronen-Synchrotron DESY Theory Group Postdoc fellow(2015/10/01-2017/09/30)
Tokyo Institute of Technology JSPS research fellow (PD)(2013/04/01-2016/03/31)
Institute for Cosmic Ray Research, The University of Tokyo Theory Group JSPS research fellow (DC2)(2011/04/01-2013/03/31)

Year & Month of Birth


Academic Society

Japan Particle and Nuclear Theory Forum
Association of Japanese Theoretical Astronomy and Astrophysics
The Physical Society of Japan



Particle/Nuclear/Cosmic ray/Astro physics

Speciality Keywords

Cosmology, Astroparticle Physics

Research Themes

Analysis of the production process of dark matter axions



  •  Primordial gravitational waves in a minimal model of particle physics and cosmology Andreas Ringwald, Ken'ichi Saikawa, Carlos Tamarit JCAP 02 046 2021/02/23
  •  Precise WIMP dark matter abundance and Standard Model thermodynamics Ken'ichi Saikawa, Satoshi Shirai JCAP 08 011 2020/08/05
  •  Stellar cooling anomalies and variant axion models Ken'ichi Saikawa, Tsutomu T. Yanagida JCAP 03 007 2020/03/03
  •  Physics potential of the International Axion Observatory (IAXO) E. Armengaud et al. (IAXO Collaboration) JCAP 06 047 2019
  •  A new experimental approach to probe QCD axion dark matter in the mass range above 40μeV P. Brun et al. (MADMAX collaboration) Eur. Phys. J. C 79 186 2019

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  •  Enhanced photon coupling of ALP dark matter adiabatically converted from the QCD axion Shu-Yu Ho, Ken'ichi Saikawa, Fuminobu Takahashi JCAP 10 042 2018
  •  Primordial gravitational waves, precisely: The role of thermodynamics in the Standard Model Ken'ichi Saikawa, Satoshi Shirai JCAP 05 035 2018
  •  Pole inflation in Jordan frame supergravity Ken'ichi Saikawa, Masahide Yamaguchi, Yasuho Yamashita, Daisuke Yoshida JCAP 01 031 2018
  •  Stellar recipes for axion hunters Maurizio Giannotti, Igor G. Irastorza, Javier Redondo, Andreas Ringwald, Ken'ichi Saikawa JCAP 10 010 2017
  •  A review of gravitational waves from cosmic domain walls Ken'ichi Saikawa Universe 3 40 2017
  •  Nonthermal axion dark radiation and constraints Anupam Mazumdar, Saleh Qutub, Ken'ichi Saikawa Phys. Rev. D 94 065030 2016
  •  Structure of Kähler potential for D-term inflationary attractor models Kazunori Nakayama, Ken'ichi Saikawa, Takahiro Terada, Masahide Yamaguchi JHEP 05 067 2016
  •  Axion dark matter in the post-inflationary Peccei-Quinn symmetry breaking scenario Andreas Ringwald, Ken'ichi Saikawa Phys. Rev. D 93 085031 2016
  •  Possible resolution of the domain wall problem in the NMSSM Anupam Mazumdar, Ken'ichi Saikawa, Masahide Yamaguchi, Jun'ichi Yokoyama Phys. Rev. D 93 025002 2016
  •  Gravitational waves from domain walls in the next-to-minimal supersymmetric standard model Kenji Kadota, Masahiro Kawasaki, Ken'ichi Saikawa JCAP 10 041 2015
  •  Axion dark matter from topological defects Masahiro Kawasaki, Ken'ichi Saikawa, Toyokazu Sekiguchi Phys. Rev. D 91 065014 2015
  •  Affleck-Dine baryogenesis with R-parity violation Tetsutaro Higaki, Kazunori Nakayama, Ken'ichi Saikawa, Tomo Takahashi, Masahide Yamaguchi Phys. Rev. D 90 045001 2014
  •  Conceptual Design of the International Axion Observatory (IAXO) E. Armengaud et al. (IAXO Collaboration) JINST 9 T05002 2014
  •  Effective gravitational interactions of dark matter axions Toshifumi Noumi, Ken'ichi Saikawa, Ryosuke Sato, Masahide Yamaguchi Phys. Rev. D 89 065012 2014
  •  On the estimation of gravitational wave spectrum from cosmic domain walls Takashi Hiramatsu, Masahiro Kawasaki, Ken'ichi Saikawa JCAP 02 031 2014
  •  Gravitational waves from smooth hybrid new infation Masahiro Kawasaki, Ken'ichi Saikawa, Naoyuki Takeda Phys. Rev. D 87 103521 2013
  •  Evolution and thermalization of dark matter axions in the condensed regime Ken'ichi Saikawa, Masahide Yamaguchi Phys. Rev. D 87 085010 2013
  •  Axion cosmology with long-lived domain walls Takashi Hiramatsu, Masahiro Kawasaki, Ken'ichi Saikawa, Toyokazu Sekiguchi JCAP 01 001 2013
  •  Production of dark matter axions from collapse of string-wall systems Takashi Hiramatsu, Masahiro Kawasaki, Ken'ichi Saikawa, Toyokazu Sekiguchi Phys. Rev. D 85 105020 2012
  •  Study of gravitational radiation from cosmic domain walls Masahiro Kawasaki, Ken'ichi Saikawa JCAP 09 008 2011
  •  Evolution of string-wall networks and axionic domain wall problem Takashi Hiramatsu, Masahiro Kawasaki, Ken'ichi Saikawa JCAP 08 030 2011
  •  Gravitational waves from collapsing domain walls Takashi Hiramatsu, Masahiro Kawasaki, Ken'ichi Saikawa JCAP 05 032 2010

Conference Presentations

  • Predicting the axion dark matter mass(conference:Extreme Mass Dark Matter Workshop: from Superlight to Superheavy)(2024/03/05)
  • Axion production from global string networks(conference:Workshop on particle physics and cosmology: Busan 2023)(2023/12/19)
  • Large scale simulations of axion strings(conference:The 32nd workshop on General Relativity and Gravitation in Japan (JGRG32))(2023/11/29)
  • Spectrum of axions from global strings and the axion dark matter mass(conference:Advancements in Axion Physics)(2023/10/18)
  • Analysis of axion production from strings(conference:The Physical Society of Japan 2023 Annual (78th) Meeting)(2023/09/18)

show all

  • Spectrum of dark matter axions from strings(conference:18th Patras Workshop on Axions, WIMPs and WISPs (AXION-WIMP 2023))(2023/07/03)
  • Axion dark matter: A perspective for the post-inflationary scenario(conference:Colloquium for COST Action CA21106 "COSMIC WISPERS")(2023/05/31)
  • Axion dark matter from cosmic string decays(conference:Dark Matter beyond the Weak Scale)(2023/03/28)
  • Axion string simulations(conference:Frontiers in Gravity and Fundamental Physics (YU Workshop 2022))(2022/11/27)
  • GW from topological defects(conference:1st workshop: Multimessenger Study of Heavy Dark Matter)(2021/08/03)
  • Spectrum of primordial gravitational waves in the SMASH model(conference:The Physical Society of Japan 2021 Annual (76th) Meeting)(2021/03/13)
  • Production mechanisms for cold dark matter axions(conference:Axions Beyond Gen 2)(2021/01/25)
  • Simulations of the axion dark matter production in the early universe(conference:Frontiers of Computational Physics from meV to MeV)(2020/12/08)
  • SMASH prediction for primordial gravitational waves(conference:Online JGRG workshop 2020)(2020/11/25)
  • News from the post-inflationary scenario(conference:MADMAX collaboration meeting)(2020/09/30)
  • Spectrum of dark matter axions(conference:The Physical Society of Japan 2020 Annual (75th) Meeting)(2020/04/15)
  • Axion cosmology with N>1(conference:MIAPP program "Axion Cosmology")(2019/03/11)


Arts and Fieldwork


Theme to the desired joint research

○Research related to particle physics, astrophysics, or theoretical physics

Grant-in-Aid for Scientific Research


Competitive research funding,Contribution

Collaborative research,Consignment study

Classes (Bachelors)

○Exercise in Quantum Mechanics 2b(2023)
○Exercise in Quantum Mechanics 2a(2023)
○Computational Physics b(2023)
○Exercise in Quantum Mechanics 1b(2023)
○Exercise in Quantum Mechanics 1a(2023)
○Academic Skills(2023)
○Exercise in Quantum Mechanics 2B(2022)
○Exercise in Quantum Mechanics 2A(2022)
○Academic Skills(2022)
○Computational Physics b(2022)
○Exercise in Quantum Mechanics 2A(2021)
○Exercise in Quantum Mechanics 2B(2021)
○Academic Skills(2021)
○Freshman Seminar I(2020)

Classes (Graduate Schools)

○Introduction to Theoretical Physics a(2023)
○Introduction to Theoretical Physics a(2022)

International Project

International Students

Lecture themes

Others (Social Activities)

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