K. Koyama

22.2k total citations · 5 hit papers
424 papers, 11.9k citations indexed

About

K. Koyama is a scholar working on Astronomy and Astrophysics, Nuclear and High Energy Physics and Aerospace Engineering. According to data from OpenAlex, K. Koyama has authored 424 papers receiving a total of 11.9k indexed citations (citations by other indexed papers that have themselves been cited), including 299 papers in Astronomy and Astrophysics, 180 papers in Nuclear and High Energy Physics and 44 papers in Aerospace Engineering. Recurrent topics in K. Koyama's work include Cosmology and Gravitation Theories (200 papers), Galaxies: Formation, Evolution, Phenomena (137 papers) and Black Holes and Theoretical Physics (121 papers). K. Koyama is often cited by papers focused on Cosmology and Gravitation Theories (200 papers), Galaxies: Formation, Evolution, Phenomena (137 papers) and Black Holes and Theoretical Physics (121 papers). K. Koyama collaborates with scholars based in Japan, United Kingdom and United States. K. Koyama's co-authors include Gong‐Bo Zhao, Gianmassimo Tasinato, Roy Maartens, Baojiu Li, Marco Crisostomi, Gustavo Niz, Jiro Soda, Fábio Silva, Shuntaro Mizuno and David Wands and has published in prestigious journals such as Nature, Physical Review Letters and SHILAP Revista de lepidopterología.

In The Last Decade

K. Koyama

412 papers receiving 11.7k citations

Hit Papers

5 papers align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

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

1995 485 citations K. Koyama et al. profile →
Cosmological tests of modified gravity

2016 453 citations K. Koyama profile →
Brane-World Gravity

2010 433 citations K. Koyama et al. arXiv (Cornell University) profile →
Extended scalar-tensor theories of gravity

2016 254 citations K. Koyama et al. Journal of Cosmology and Astroparticle Physics profile →
Degenerate higher order scalar-tensor theories beyond Horndeski up to cubic order

2016 251 citations K. Koyama et al. profile →

Peers

Countries citing papers authored by K. Koyama

Since Specialization

Citations

This map shows the geographic impact of K. Koyama's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by K. Koyama with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites K. Koyama more than expected).

Fields of papers citing papers by K. Koyama

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by K. Koyama. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by K. Koyama. The network helps show where K. Koyama may publish in the future.

Co-authorship network of co-authors of K. Koyama

This figure shows the co-authorship network connecting the top 25 collaborators of K. Koyama. A scholar is included among the top collaborators of K. Koyama based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with K. Koyama. K. Koyama is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

Sort: Min cites: Since: Top N: Style:

20 of 20 papers shown

#	Work	Indexed citations
1	Extending MGCAMB tests of gravity to nonlinear scales 2024 ·Journal of Cosmology and Astroparticle Physics ·(unknown), (unknown), K. Koyama, Levon Pogosian, Benjamin Bose, (unknown), Gong‐Bo Zhao	4
2	A multitracer analysis for the eBOSS galaxy sample based on the effective field theory of large-scale structure 2024 ·Monthly Notices of the Royal Astronomical Society ·(unknown), (unknown), Rafaela Gsponer, (unknown), (unknown), (unknown), Yuting Wang, Gong‐Bo Zhao, K. Koyama, David Bacon, Robert Crittenden	7
3	Cosmological constraints on early dark energy from the full shape analysis of eBOSS DR16 2024 ·Monthly Notices of the Royal Astronomical Society ·Rafaela Gsponer, (unknown), (unknown), David Bacon, K. Koyama, Robert Crittenden, Théo Simon, Eva-Maria Mueller	14
4	Yeast diversity during the spontaneous fermentation of wine in a winery and in a laboratory using sterilized equipment 2024 ·Journal of Bioscience and Bioengineering ·(unknown), (unknown), Takeshi Akao, Yoshinobu Kanno, K. Koyama, Kazuhiro Iwashita, Nami Goto‐Yamamoto	0
5	Extracting high-order cosmological information in galaxy surveys with power spectra 2024 ·Communications Physics ·Yuting Wang, Gong‐Bo Zhao, K. Koyama, Will J. Percival, Ryuichi Takahashi, Chiaki Hikage, Héctor Gil-Marín, ChangHoon Hahn, (unknown), (unknown), (unknown), Yu Yu, Hong-Ming Zhu, Fei Ge	10
6	An analysis of the effectiveness of reflective learning through watching videos recorded with smart glasses—With multiple views (student, patient, and overall) in radiography education 2024 ·PLoS ONE ·(unknown), Shinsuke Kyogoku, (unknown), Hajime Sakamoto, (unknown), K. Koyama, Issei Fukunaga, (unknown), (unknown), Shuko Nojiri, (unknown), Yuji Nishizaki, Hiroyuki Daida	4
7	The separate-universe approach and sudden transitions during inflation 2024 ·Journal of Cosmology and Astroparticle Physics ·(unknown), Hooshyar Assadullahi, Andrew D. Gow, K. Koyama, Vincent Vennin, David Wands	29
8	Analysis of unified galaxy power spectrum multipole measurements 2023 ·Monthly Notices of the Royal Astronomical Society ·(unknown), Rafaela Gsponer, (unknown), K. Koyama, Florian Beutler	11
9	Yeast diversity during the spontaneous fermentation of wine with only the microbiota on grapes cultivated in Japan 2023 ·Journal of Bioscience and Bioengineering ·(unknown), (unknown), K. Koyama, Kazuhiro Iwashita, Nami Goto‐Yamamoto	14
10	Non-perturbative non-Gaussianity and primordial black holes 2023 ·Europhysics Letters (EPL) ·Andrew D. Gow, Hooshyar Assadullahi, (unknown), K. Koyama, Vincent Vennin, David Wands	69
11	A New Consistency Test for ΛCDM Cosmology Using Galaxy Surveys 2022 ·Research in Astronomy and Astrophysics ·(unknown), Gong‐Bo Zhao, Yuting Wang, (unknown), (unknown), (unknown), (unknown), David Bacon, K. Koyama	1
12	Enabling matter power spectrum emulation in beyond-ΛCDM cosmologies with COLA 2022 ·Journal of Cosmology and Astroparticle Physics ·(unknown), (unknown), K. Koyama, Hans A. Winther	17
13	Modified gravityN-body code comparison project 2015 ·Monthly Notices of the Royal Astronomical Society ·Hans A. Winther, Fabian Schmidt, Alexandre Barreira, Christian Arnold, Sownak Bose, Claudio Llinares, Marco Baldi, Bridget Falck, Wojciech A. Hellwing, K. Koyama, Baojiu Li, David F. Mota, Ewald Puchwein, R. C. Smith, Gong‐Bo Zhao	93
14	Haloes and voids in f(R) gravity 2012 ·Monthly Notices of the Royal Astronomical Society ·Baojiu Li, Gong‐Bo Zhao, K. Koyama	139
15	CMB Anisotropies in Brane Worlds 2003 ·arXiv (Cornell University) ·K. Koyama	2
16	Evaluations of Domestic X-ray CCDs with XIS Analog Electronics 2001 ·Aya Bamba, (unknown), (unknown), (unknown), Masahiro Tsujimoto, Takeshi Go Tsuru, K. Koyama, Hisamitsu Awaki, (unknown), Kentaro Hayashida, Haruyoshi Katayama, T. Tsunemi	1
17	The large area counter on Ginga. 1989 ·Publications of the Astronomical Society of Japan ·Martin Turner, (unknown), B. E. Patchett, D. H. Reading, K. Makishima, T. Ohashi, Tadayasu Dotani, Kentaro Hayashida, H. Inoue, Hitoshi Kondo, K. Koyama, (unknown), Y. Ogawara, S. Takano, Hisamitsu Awaki, Yuzuru Tawara, N. Nakamura	18
18	Hard X-ray emission from Markarian 348. 1989 ·Publications of the Astronomical Society of Japan ·R. S. Warwick, K. Koyama, H. Inoue, S. Takano, (unknown), R. Hoshi	3
19	GINGA observation of the X-ray pulsar 1E 2259+586 in the supernova remnant G 109.1-1.0 1989 ·Publications of the Astronomical Society of Japan ·K. Koyama, F. Nagase, Y. Ogawara, (unknown), N. Kawai, Mark H. Jones, (unknown), M. G. Watson, Kazuo Makishima, T. Ohashi	4
20	X-ray and radio observations of flares from the RS Canum Venaticorum system UX Arietis. 1989 ·Publications of the Astronomical Society of Japan ·Takeshi Go Tsuru, K. Makishima, T. Ohashi, H. Inoue, K. Koyama, Martin Turner, M. A. Barstow, I. M. McHardy, J. P. Pye, H. Tsunemi, (unknown), A. R. Taylor, Robert F. Nelson	7

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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