Research outputs per year
Research outputs per year
Professor
Accepting PhD Students
PhD projects
theoretical cosmology
I am a Professor of Cosmology in the Institute of Cosmology and Gravitation at the University of Portsmouth. My research interests lie in theoretical cosmology, particularly the origin of structure in our Universe and the late time acceleration of the Universe. My research is supported by the Science and Technology Facilities Council and the European Research Council’s consolidator grant “Cosmological Tests of Gravity”. I was supported by the European Research Council’s starting grant, “Modified gravity models as an alternative to dark energy” between 2008 and 2013. I was awarded my PhD from Kyoto University in 2002. Previous awards include RCUK academic fellowship, PPARC psotdoctoral fellowship, Japanese JSPS potdoctoral fellowship. In 2009 I was awarded the Philipe Leverhulme prize and in 2010 I received the Young Scientist Award of the Physical Society of Japan. I was a PI of a Royal Society International Joint Project with the Yukawa Institute at Kyoto University. The collaboration between Portsmouth and Kyoto University was awarded the Daiwa-Adrian prize in 2010.
My main research interest lies in theoretical cosmology. I study the origin of structure in our Universe and test the early universe models using the statistical properties of the cosmic microwave background and the large scale structure of the Universe. I am also interested in explaining the late time acceleration of the Universe. Particularly I investigate a possibility to realise the late time acceleration by modifying general relativity on cosmological scales and develop cosmological tests of gravity.
Research output: Contribution to journal › Article › peer-review
Research output: Contribution to journal › Article › peer-review
Research output: Contribution to journal › Article › peer-review
Research output: Contribution to journal › Article › peer-review
Research output: Contribution to journal › Article › peer-review
Hikage, C. (Creator), Koyama, K. (Creator) & Takahashi, R. (Creator), American Physical Society, 20 Jan 2020
Dataset
Ross, A. (Creator), Bautista, J. (Creator) & Koyama, K. (Creator), Oxford University Press, 21 Aug 2020
Dataset
Koyama, K. (Creator), University of Portsmouth, 11 Jun 2018
Dataset
Frusciante, N. (Creator), Kase, R. (Creator), Koyama, K. (Creator), Tsujikawa, S. (Creator) & Vernieri, D. (Creator), Elsevier BV, 5 Jan 2019
Dataset
Braglia, M. (Creator), Ballardini, M. (Creator), Finelli, F. (Creator) & Koyama, K. (Creator), American Physical Society, 15 Jan 2021
Dataset
Crittenden, R. (PI), Amara, A. (CoI), Assadullahi, H. (CoI), Bacon, D. (CoI), Graur, O. (CoI), Koyama, K. (CoI), Wands, D. (CoI) & Noller, J. (CoI)
1/04/22 → 31/03/25
Project: Research
Nichol, B. (PI), Wands, D. (CoI), Koyama, K. (CoI), Crittenden, R. (CoI) & Bruni, M. (CoI)
Science and Technology Facilities Council
1/11/13 → 31/03/15
Project: Research
Nichol, B. (PI), Maartens, R. (CoI), Maraston, C. (CoI), Wands, D. (CoI), Thomas, D. (CoI), Crittenden, R. (CoI), Bacon, D. (CoI), Koyama, K. (CoI), Bruni, M. (CoI) & Percival, W. (CoI)
Science and Technology Facilities Council
1/04/13 → 31/03/16
Project: Research
Wands, D. (PI), Maartens, R. (CoI), Crittenden, R. (CoI), Bacon, D. (CoI), Koyama, K. (CoI), Bruni, M. (CoI), Percival, W. (CoI) & Nichol, B. (CoI)
Science and Technology Facilities Council
1/04/10 → 31/03/15
Project: Research
Koyama, K. (Speaker)
Activity: Talk or presentation types › Invited talk
Koyama, K. (Speaker)
Activity: Talk or presentation types › Invited talk
Koyama, K. (Speaker)
Activity: Talk or presentation types › Invited talk
Koyama, K. (Invited speaker)
Activity: Talk or presentation types › Invited talk
Koyama, K. (Speaker)
Activity: Talk or presentation types › Invited talk
Koyama, K. (Recipient), 2010
Prize: Prize (including medals and awards)
16/08/22 → 18/08/22
1 item of Media coverage, 1 Media contribution
Press/Media: Expert comment
19/09/18 → 5/10/18
1 item of Media coverage, 1 Media contribution
Press/Media: Expert comment