Obinna Umeh

974 total citations
22 papers, 427 citations indexed

About

Obinna Umeh is a scholar working on Astronomy and Astrophysics, Nuclear and High Energy Physics and Oceanography. According to data from OpenAlex, Obinna Umeh has authored 22 papers receiving a total of 427 indexed citations (citations by other indexed papers that have themselves been cited), including 17 papers in Astronomy and Astrophysics, 8 papers in Nuclear and High Energy Physics and 2 papers in Oceanography. Recurrent topics in Obinna Umeh's work include Cosmology and Gravitation Theories (14 papers), Galaxies: Formation, Evolution, Phenomena (14 papers) and Black Holes and Theoretical Physics (5 papers). Obinna Umeh is often cited by papers focused on Cosmology and Gravitation Theories (14 papers), Galaxies: Formation, Evolution, Phenomena (14 papers) and Black Holes and Theoretical Physics (5 papers). Obinna Umeh collaborates with scholars based in South Africa, United Kingdom and Italy. Obinna Umeh's co-authors include Chris Clarkson, Roy Maartens, George Ellis, Julien Larena, A. Faltenbacher, Jean–Philippe Uzan, Mário G. Santos, S. Camera, K. Koyama and Ruth Durrer and has published in prestigious journals such as SHILAP Revista de lepidopterología, Monthly Notices of the Royal Astronomical Society and Reports on Progress in Physics.

In The Last Decade

Obinna Umeh

20 papers receiving 420 citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
Obinna Umeh South Africa 12 413 201 41 31 17 22 427
Shohei Saga Japan 12 291 0.7× 145 0.7× 21 0.5× 16 0.5× 8 0.5× 27 295
Артур Д. Чернин Russia 6 203 0.5× 89 0.4× 22 0.5× 23 0.7× 20 1.2× 18 232
Chen Heinrich United States 9 208 0.5× 87 0.4× 39 1.0× 11 0.4× 19 1.1× 17 223
S. Grandis Germany 11 247 0.6× 100 0.5× 93 2.3× 12 0.4× 13 0.8× 21 266
Wolfgang Enzi United Kingdom 9 350 0.8× 176 0.9× 82 2.0× 15 0.5× 44 2.6× 17 377
Alberto Rorai United States 7 296 0.7× 131 0.7× 62 1.5× 31 1.0× 24 1.4× 7 318
Martin Goliath Sweden 8 341 0.8× 256 1.3× 9 0.2× 48 1.5× 18 1.1× 11 354
Xufen Wu China 11 367 0.9× 94 0.5× 119 2.9× 21 0.7× 5 0.3× 22 380
Matthew M. Pieri United States 11 362 0.9× 112 0.6× 76 1.9× 13 0.4× 14 0.8× 27 370
A. Füzfa France 8 281 0.7× 167 0.8× 48 1.2× 38 1.2× 14 0.8× 17 294

Countries citing papers authored by Obinna Umeh

Since Specialization
Citations

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

Fields of papers citing papers by Obinna Umeh

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Obinna Umeh

This figure shows the co-authorship network connecting the top 25 collaborators of Obinna Umeh. A scholar is included among the top collaborators of Obinna Umeh 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 Obinna Umeh. Obinna Umeh is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
Umeh, Obinna. (2023). Vorticity generation in cosmology and the role of shell crossing. Journal of Cosmology and Astroparticle Physics. 2023(12). 43–43. 1 indexed citations
2.
Umeh, Obinna. (2022). Consequences of using a smooth cosmic distance in a lumpy universe. I.. Physical review. D. 106(2). 6 indexed citations
3.
Umeh, Obinna, Roy Maartens, Hamsa Padmanabhan, & S. Camera. (2021). The effect of finite halo size on the clustering of neutral hydrogen. Journal of Cosmology and Astroparticle Physics. 2021(6). 27–27. 5 indexed citations
4.
Maartens, Roy, et al.. (2021). Detecting the relativistic bispectrum in 21cm intensity maps. Journal of Cosmology and Astroparticle Physics. 2021(6). 39–39. 18 indexed citations
5.
Maartens, Roy, et al.. (2020). Detecting the relativistic galaxy bispectrum. Journal of Cosmology and Astroparticle Physics. 2020(3). 65–65. 20 indexed citations
6.
Umeh, Obinna, et al.. (2020). Sensitivity of Real Estate Investment Return to Market Return Index: The Case of Nigerian Real Estate Investment Trusts. SHILAP Revista de lepidopterología. 8(1). 197–207.
7.
Umeh, Obinna & K. Koyama. (2019). The galaxy bias at second order in general relativity with non-Gaussian initial conditions. Journal of Cosmology and Astroparticle Physics. 2019(12). 48–48. 5 indexed citations
8.
Clarkson, Chris, et al.. (2019). The dipole of the galaxy bispectrum. Monthly Notices of the Royal Astronomical Society Letters. 486(1). L101–L104. 28 indexed citations
9.
Koyama, K., Obinna Umeh, Roy Maartens, & Daniele Bertacca. (2018). The observed galaxy bispectrum from single-field inflation in the squeezed limit. Journal of Cosmology and Astroparticle Physics. 2018(7). 50–50. 18 indexed citations
10.
Pénin, Aurélie, Obinna Umeh, & Mário G. Santos. (2017). A scale-dependent bias on linear scales: the case for H i intensity mapping at z = 1. Monthly Notices of the Royal Astronomical Society. 473(4). 4297–4305. 14 indexed citations
11.
Umeh, Obinna, Roy Maartens, & Mário G. Santos. (2016). Nonlinear modulation of the HI power spectrum on ultra-large scales. I. Journal of Cosmology and Astroparticle Physics. 2016(3). 61–61. 12 indexed citations
12.
Umeh, Obinna, et al.. (2015). An Examination of Impact of Tertiary Healthcare Facility Design on User Needs and Satisfaction In South East Nigeria. Journals & Books Hosting (International Knowledge Sharing Platform). 5(5). 73–78. 2 indexed citations
13.
Bonvin, Camille, Chris Clarkson, Ruth Durrer, Roy Maartens, & Obinna Umeh. (2015). Do we care about the distance to the CMB? Clarifying the impact of second-order lensing. Journal of Cosmology and Astroparticle Physics. 2015(6). 50–50. 27 indexed citations
14.
Clarkson, Chris, Obinna Umeh, Roy Maartens, & Ruth Durrer. (2014). What is the distance to the CMB? How relativistic corrections remove the tension with local H0 measurements. arXiv (Cornell University). 1 indexed citations
15.
Umeh, Obinna, Chris Clarkson, & Roy Maartens. (2014). Nonlinear relativistic corrections to cosmological distances, redshift and gravitational lensing magnification: II. Derivation. Classical and Quantum Gravity. 31(20). 205001–205001. 30 indexed citations
16.
Umeh, Obinna, Chris Clarkson, & Roy Maartens. (2014). Nonlinear relativistic corrections to cosmological distances, redshift and gravitational lensing magnification: I. Key results. Classical and Quantum Gravity. 31(20). 202001–202001. 29 indexed citations
17.
Clarkson, Chris, George Ellis, A. Faltenbacher, et al.. (2012). (Mis)interpreting supernovae observations in a lumpy universe. Monthly Notices of the Royal Astronomical Society. 426(2). 1121–1136. 76 indexed citations
18.
Abah, Obinna, et al.. (2011). 100 Years of Superconductivity: The Contributions and Challenges of Researchers in Nigeria. 1 indexed citations
19.
Clarkson, Chris, George Ellis, Julien Larena, & Obinna Umeh. (2011). Does the growth of structure affect our dynamical models of the Universe? The averaging, backreaction, and fitting problems in cosmology. Reports on Progress in Physics. 74(11). 112901–112901. 116 indexed citations
20.
Umeh, Obinna. (2009). Scanning the parameter space of holographic superconductors. Journal of High Energy Physics. 2009(8). 62–62. 16 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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