2026 Katsuji Koyama: Physics Researcher – H-Index, Publications & Awards

Discipline name	D-Index	World Ranking	Current World Ranking	National Ranking	Current National Ranking	Publications	Citations
Physics	87	2459	2337	69	66	728	29205

Discipline name

D-Index

World Ranking

Current World Ranking

National Ranking

Current National Ranking

Publications

Citations

Physics

2459

2337

728

29205

Overview

Katsuji Koyama is affiliated with Kyoto University in Japan and primarily works within the field of Physics and Astronomy. Their research encompasses a wide range of topics related to cosmology, gravitation, and astrophysics.

The scientist's work focuses on several main topics including:

Cosmology and Gravitation Theories
Galaxies: Formation, Evolution, Phenomena
Astrophysics and Cosmic Phenomena
Particle physics theoretical and experimental studies
Geophysics and Gravity Measurements
Astronomy and Astrophysical Research
Black Holes and Theoretical Physics

Koyama's subfields of study highlight their expertise in:

Astronomy and Astrophysics
Nuclear and High Energy Physics
Oceanography
Instrumentation
Artificial Intelligence

They have published extensively across several scholarly platforms, with frequent contributions to:

arXiv (Cornell University)
Zenodo (CERN European Organization for Nuclear Research)
Journal of Cosmology and Astroparticle Physics
Monthly Notices of the Royal Astronomical Society
Physical Review D

Their notable recent papers include:

"Cosmology with the Laser Interferometer Space Antenna" (2023), published in Living Reviews in Relativity
"Early modified gravity in light of the H₀ tension and LSS data" (2021), published in Physical Review D
"Unified framework for early dark energy from α-attractors" (2020), published in Physical Review D
"Larger value for H₀ by an evolving gravitational constant" (2020), published in Physical Review D
"Novel Probes Project: Tests of gravity on astrophysical scales" (2021), published in Reviews of Modern Physics

The scientist collaborates regularly with several co-authors, among the most frequent being:

C. Carbone
Hans A. Winther
Benjamin Bose
C. Giocoli
Baojiu Li

In addition to journal articles, Koyama has contributed to book publications, including a title published by the European Organization for Nuclear Research:

Book of Abstracts: 12th International Conference on Predictive Modelling in Food (ICPMF12), 2023

Best Publications

Energy spectra of low-mass binary X-ray sources observed from TENMA

K. Mitsuda;H. Inoue;K. Koyama;K. Makishima

1529
Citations
Evidence for shock acceleration of high-energy electrons in the supernova remnant SN1006

K. Koyama;R. Petre;E. V. Gotthelf;E. V. Gotthelf;U. Hwang

1267
Citations
The X-Ray Observatory Suzaku

Kazuhisa Mitsuda;Mark Bautz;Hajime Inoue;Richard L. Kelley

1254
Citations
X-Ray Imaging Spectrometer (XIS) on Board Suzaku

Katsuji Koyama;Hiroshi Tsunemi;Tadayasu Dotani;Mark W. Bautz

1226
Citations
ASCA View of Our Galactic Center: Remains of Past Activities in X-Rays?

Katsuji Koyama;Yoshitomo Maeda;Takashi Sonobe;Toshiaki Takeshima

650
Citations
The quiescent intracluster medium in the core of the Perseus cluster

Felix Aharonian;Felix Aharonian;Hiroki Akamatsu;Fumie Akimoto;Steven W. Allen

474
Citations
Fine Structures of Shock of SN 1006 with the Chandra Observation

Aya Bamba;Ryo Yamazaki;Masaru Ueno;Katsuji Koyama

446
Citations
Small-Scale Structure of the SN 1006 Shock with Chandra Observations

Aya Bamba;Ryo Yamazaki;Masaru Ueno;Katsuji Koyama

396
Citations
Discovery of Non-Thermal X-Rays from the Northwest Shell of the New SNR RX J1713.7-3946: The Second SN 1006?

Katsuji Koyama;Kenzo Kinugasa;Keiichi Matsuzaki;Mamiko Nishiuchi

370
Citations
Discovery of Non Thermal X-Rays from the Northwest Shell of the New SNR RX J1713.7-3946: The Second SN1006 ?

Katsuji Koyama;Kenzo Kinugasa;Keiichi Matsuzaki;Mamiko Nishiuchi

341
Citations
Faint X-Ray Sources Resolved in the ASCA Galactic Plane Survey and Their Contribution to the Galactic Ridge X-Ray Emission

Mutsumi Sugizaki;Mutsumi Sugizaki;Kazuhisa Mitsuda;Hidehiro Kaneda;Keiichi Matsuzaki

338
Citations
Discovery of a Luminous, Variable, Off-Center Source in the Nucleus of M82 with the Chandra HRC

H. Matsumoto;T. G. Tsuru;K. Koyama;H. Awaki

326
Citations
The ASTRO-H mission

Tadayuki Takahashi;Kazuhisa Mitsuda;Richard Kelley;Felix Aharonian

322
Citations
Chandra Observation of the ρ Ophiuchi Cloud

Kensuke Imanishi;Katsuji Koyama;Yohko Tsuboi

317
Citations
Frontiers of X-ray astronomy

Yasuo Tanaka;Katsuji Koyama

315
Citations
A Spatial and Spectral Study of Nonthermal Filaments in Historical Supernova Remnants: Observational Results with Chandra

Aya Bamba;Ryo Yamazaki;Tatsuo Yoshida;Toshio Terasawa

310
Citations
Discovery of an unusual hard X-ray source in the region of supernova 1987A

T. Dotani;K. Hayashida;H. Inoue;M. Itoh

310
Citations
ASCA X-Ray Spectroscopy of Large Magellanic Cloud Supernova Remnants and the Metal Abundances of the Large Magellanic Cloud

John P. Hughes;Ichizo Hayashi;Katsuji Koyama

295
Citations
Intense 6.7-KeV iron line emission from the galactic centre

K. Koyama;H. Awaki;H. Kunieda;S. Takano

289
Citations
ASCA X-Ray Spectroscopy of LMC Supernova Remnants and the Metal Abundances of the LMC

John P. Hughes;Ichizo Hayashi;Katsuji Koyama

282
Citations