Kai Murai

787 total citations · 1 hit paper
35 papers, 464 citations indexed

About

Kai Murai is a scholar working on Nuclear and High Energy Physics, Astronomy and Astrophysics and Oceanography. According to data from OpenAlex, Kai Murai has authored 35 papers receiving a total of 464 indexed citations (citations by other indexed papers that have themselves been cited), including 31 papers in Nuclear and High Energy Physics, 30 papers in Astronomy and Astrophysics and 2 papers in Oceanography. Recurrent topics in Kai Murai's work include Cosmology and Gravitation Theories (30 papers), Dark Matter and Cosmic Phenomena (25 papers) and Particle physics theoretical and experimental studies (16 papers). Kai Murai is often cited by papers focused on Cosmology and Gravitation Theories (30 papers), Dark Matter and Cosmic Phenomena (25 papers) and Particle physics theoretical and experimental studies (16 papers). Kai Murai collaborates with scholars based in Japan, Germany and United Kingdom. Kai Murai's co-authors include Masahiro Kawasaki, Wen Yin, Tomohiro Fujita, Fuminobu Takahashi, Hiromasa Nakatsuka, Naoya Kitajima, Eiichiro Komatsu, Toshiya Namikawa, Shinji Tsujikawa and Y. Minami and has published in prestigious journals such as Physical Review Letters, Physics Letters B and Journal of High Energy Physics.

In The Last Decade

Kai Murai

33 papers receiving 459 citations

Hit 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.

Gravitational waves from domain wall collapse, and application to nanohertz signals with QCD-coupled axions

2024 70 citations Naoya Kitajima, Kai Murai et al. Physics Letters B profile →

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name	h						Papers	Cites
Kai Murai Japan	12	410	355	34	19	15	35	464
James B. Mertens United States	12	370 0.9×	223 0.6×	22 0.6×	17 0.9×	31 2.1×	21	395
Hiromasa Nakatsuka Japan	10	276 0.7×	255 0.7×	11 0.3×	52 2.7×	10 0.7×	18	309
Ke-Pan Xie China	13	378 0.9×	484 1.4×	20 0.6×	23 1.2×	16 1.1×	32	571
R. M. Campbell Netherlands	12	338 0.8×	235 0.7×	19 0.6×	10 0.5×	6 0.4×	30	345
C. Frigerio Martins Italy	6	403 1.0×	370 1.0×	20 0.6×	29 1.5×	30 2.0×	6	473
Ruchika Ruchika India	11	469 1.1×	294 0.8×	25 0.7×	6 0.3×	19 1.3×	14	497
Juan Urrutia Estonia	9	322 0.8×	140 0.4×	47 1.4×	14 0.7×	9 0.6×	15	337
I. Novikov Russia	4	359 0.9×	250 0.7×	34 1.0×	9 0.5×	16 1.1×	7	370
Miguel Vanvlasselaer Belgium	9	215 0.5×	224 0.6×	5 0.1×	35 1.8×	16 1.1×	18	291
Miguel Bezares Italy	10	455 1.1×	200 0.6×	59 1.7×	32 1.7×	16 1.1×	20	465

Countries citing papers authored by Kai Murai

Since Specialization

Citations

This map shows the geographic impact of Kai Murai'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 Kai Murai with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Kai Murai more than expected).

Fields of papers citing papers by Kai Murai

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Kai Murai. 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 Kai Murai. The network helps show where Kai Murai may publish in the future.

Co-authorship network of co-authors of Kai Murai

This figure shows the co-authorship network connecting the top 25 collaborators of Kai Murai. A scholar is included among the top collaborators of Kai Murai 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 Kai Murai. Kai Murai 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

1.

Murai, Kai, Kodai Sakurai, & Fuminobu Takahashi. (2025). Primordial black hole formation via inverted bubble collapse. Journal of High Energy Physics. 2025(7).

2.

Murai, Kai & Fuminobu Takahashi. (2025). Anthropic selection in a model with negative Λ plus axion dark energy. Physical review. D. 112(10). 1 indexed citations

3.

Murai, Kai. (2025). Isotropic cosmic birefringence from an oscillating axionlike field. Physical review. D. 111(4). 3 indexed citations

4.

Murai, Kai, et al.. (2025). More is different: multi-axion dynamics changes topological defect evolution. Journal of Cosmology and Astroparticle Physics. 2025(4). 2–2. 2 indexed citations

5.

Kasai, Kentaro, et al.. (2025). Supermassive black hole formation from Affleck-Dine mechanism with suppressed clustering on large scales. Physical review. D. 111(8). 2 indexed citations

6.

Fujita, Tomohiro, Kai Murai, Kazunori Nakayama, & Wen Yin. (2024). Misalignment production of vector boson dark matter from axion-SU(2) inflation. Journal of Cosmology and Astroparticle Physics. 2024(4). 7–7. 5 indexed citations

7.

Kasai, Kentaro, et al.. (2024). Primordial origin of supermassive black holes from axion bubbles. Journal of Cosmology and Astroparticle Physics. 2024(5). 92–92. 3 indexed citations

8.

Kawasaki, Masahiro & Kai Murai. (2024). Enhancement of gravitational waves at Q-ball decay including non-linear density perturbations. Journal of Cosmology and Astroparticle Physics. 2024(1). 50–50. 21 indexed citations

9.

Murai, Kai, et al.. (2024). Induced domain walls of QCD axion, and gravitational waves. Journal of Cosmology and Astroparticle Physics. 2024(10). 38–38. 7 indexed citations

10.

Kasai, Kentaro, Masahiro Kawasaki, & Kai Murai. (2024). Affleck-Dine leptogenesis scenario for resonant production of sterile neutrino dark matter. Journal of Cosmology and Astroparticle Physics. 2024(8). 8–8. 2 indexed citations

11.

Kitajima, Naoya, et al.. (2024). Gravitational waves from domain wall collapse, and application to nanohertz signals with QCD-coupled axions. Physics Letters B. 851. 138586–138586. 70 indexed citations breakdown →

12.

Kasai, Kentaro, et al.. (2023). Clustering of primordial black holes from QCD axion bubbles. Journal of Cosmology and Astroparticle Physics. 2023(10). 49–49. 10 indexed citations

13.

Eskilt, Johannes R., et al.. (2023). Constraints on Early Dark Energy from Isotropic Cosmic Birefringence. Physical Review Letters. 131(12). 121001–121001. 34 indexed citations

14.

Murai, Kai, Fuminobu Takahashi, Masaki Yamada, & Wen Yin. (2023). Can baryon asymmetry be explained by a large initial value before inflation?. Physical review. D. 108(8). 1 indexed citations

15.

Murai, Kai & Wen Yin. (2023). A novel probe of supersymmetry in light of nanohertz gravitational waves. Journal of High Energy Physics. 2023(10). 23 indexed citations

16.

Kasuya, Shinta, Masahiro Kawasaki, & Kai Murai. (2023). Enhancement of second-order gravitational waves at Q-ball decay. Journal of Cosmology and Astroparticle Physics. 2023(5). 53–53. 14 indexed citations

17.

Murai, Kai, et al.. (2023). Isotropic cosmic birefringence from early dark energy. Physical review. D. 107(4). 39 indexed citations

18.

Eijima, Shintaro, Masahiro Ibe, & Kai Murai. (2023). Muon g − 2 and non-thermal leptogenesis in $$ \textrm{U}{(1)}_{L_{\mu }-{L}_{\tau }} $$ model. Journal of High Energy Physics. 2023(5). 6 indexed citations

19.

Murai, Kai, Fuminobu Takahashi, & Wen Yin. (2023). QCD axion: A unique player in the axiverse with mixings. Physical review. D. 108(3). 14 indexed citations

20.

Fujita, Tomohiro, Y. Minami, Kai Murai, & Hiromasa Nakatsuka. (2021). Probing axionlike particles via cosmic microwave background polarization. Physical review. D. 103(6). 35 indexed citations

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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