Kazuya Koyama Portrait

Professor Kazuya Koyama

Professor of Cosmology

Kazuya.Koyama@port.ac.uk

PhD Supervisor

View my research outputs
Faculty of Technology Cosmology and astrophysics Institute of Cosmology and Gravitation

Biography

I am a Professor of Cosmology in the Institute of Cosmology and Gravitation at the 黑料正能量. 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. I was supported by the European Research Council鈥檚 consolidator grant 鈥淐osmological Tests of Gravity鈥 between 2015 and 2021 and the European Research Council鈥檚 starting grant, 鈥淢odified gravity models as an alternative to dark energy鈥 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 recieved the Yukawa-Kimura prize of the Yukawa memorial foundation in 2023. 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. 

Research interests

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 outputs

2025

Gu, G., Wang, X., Wang, Y., Zhao, G., Pogosian, L., Koyama, K., Peacock, J. A., Cai, Z., Cervantes-Cota, J. L., Zhao, R., Ahlen, S., Bianchi, D., Brooks, D., Claybaugh, T., Cole, S., Macorra, A. d. l., de Mattia, A., Doel, P., Ferraro, S., Forero-Romero, J. E., Gazta帽aga, E., Gontcho, S. G. A., Gutierrez, G., Hahn, C., Howlett, C., Ishak, M., Kehoe, R., Kirkby, D., Kneib, J., Lahav, O., Landriau, M., Guillou, L. L., Leauthaud, A., Levi, M., Manera, M., Meisner, A., Miquel, R., Moustakas, J., Mu帽oz-Guti茅rrez, A., Nadathur, S., Newman, J. A., Palanque-Delabrouille, N., Percival, W., Prada, F., P茅rez-R脿fols, I., Rossi, G., Samushia, L., Sanchez, E., Schlegel, D., Seo, H.

29 Sep 2025, In: Nature Astronomy

Research output: Article

Saadeh, D., Koyama, K., Morice-Atkinson, X.

22 Sep 2025, In: Monthly Notices of the Royal Astronomical Society

Research output: Article

Hoyland, S., Winther, H. A., Saadeh, D., Koyama, K., Izard, A.

1 Aug 2025, In: Monthly Notices of the Royal Astronomical Society. 541, 4, p. 3167鈥3183

Research output: Article

Collaboration, E., Koyama, K., Pamuk, S., Casas, S., Bose, B., Carrilho, P., S谩ez-Casares, I., Atayde, L., Cataneo, M., Fiorini, B., Giocoli, C., Brun, A. M. C. L., Pace, F., Pourtsidou, A., Rasera, Y., Sakr, Z., Winther, H. -., Altamura, E., Adamek, J., Baldi, M., Breton, M. -., R谩cz, G., Vernizzi, F., Amara, A., Andreon, S., Auricchio, N., Baccigalupi, C., Bardelli, S., Bernardeau, F., Bodendorf, C., Bonino, D., Branchini, E., Brescia, M., Brinchmann, J., Caillat, A., Camera, S., Capobianco, V., Carbone, C., Carretero, J., Duncan, C. A. J., Markovic, K., Percival, W. J., S谩nchez, A. G., Taylor, A. N., Wang, Y., Weller, J., Gaztanaga, E., Joudaki, S., Kirkpatrick, C. C., Nadathur, S.

17 Jun 2025, In: Astronomy and Astrophysics. 698, 23p., A233

Research output: Article

Zhang, W., Zhao, R., Mu, X., Koyama, K., Takahashi, R., Wang, Y., Zhao, G.

28 May 2025, In: Research in Astronomy and Astrophysics. 25, 6, 11p., 065008

Research output: Article

Zhang, W., Zhao, R., Mu, X., Koyama, K., Takahashi, R., Wang, Y., Zhao, G.

27 May 2025, In: The Astrophysical Journal. 985, 15p., 218

Research output: Article

Collaboration, E., Mellier, Y., Barroso, J. A. A., Ach煤carro, A., Adamek, J., Adam, R., Addison, G. E., Aghanim, N., Aguena, M., Ajani, V., Akrami, Y., Al-Bahlawan, A., Alavi, A., Albuquerque, I. S., Alestas, G., Alguero, G., Allaoui, A., Allevato, V., Alonso-Tetilla, A. V., Altieri, B., Alvarez-Candal, A., Amara, A., Avila, S., Bacon, D., Beutler, F., Bose, B., Collett, T. E., Fiorini, B., Fonseca, J., Gaztanaga, E., Joudaki, S., Koyama, K., Leclercq, F., Manera, M., Maraston, C., Markovic, K., Nadathur, S., Nichol, R. C., Noller, J., Pace, F., Pattison, C., Percival, W. J., Pollack, J. E., Pourtsidou, A., Raccanelli, A., Schewtschenko, J. A., Whalen, D. J., Winther, H. -., Youles, S., Fonseca De La Bella, L.

1 May 2025, In: Astronomy and Astrophysics. 697, 94p., A1

Research output: Article

Jackson, J. H. P., Assadullahi, H., Gow, A. D., Koyama, K., Vennin, V., Wands, D.

24 Apr 2025, In: Journal of Cosmology and Astroparticle Physics. 2025, 04, 30p., 073

Research output: Article

Collaboration, E., R谩cz, G., Breton, M. -., Fiorini, B., Brun, A. M. C. L., Winther, H. -., Sakr, Z., Pizzuti, L., Ragagnin, A., Gayoux, T., Altamura, E., Carella, E., Pardede, K., Verza, G., Koyama, K., Baldi, M., Pourtsidou, A., Vernizzi, F., Adame, A. G., Adamek, J., Avila, S., Carbone, C., Despali, G., Giocoli, C., Hern谩ndez-Aguayo, C., Hassani, F., Kunz, M., Li, B., Rasera, Y., Yepes, G., Gonzalez-Perez, V., Corasaniti, P. -., Garc铆a-Bellido, J., Hamaus, N., Kiessling, A., Marinucci, M., Moretti, C., Mota, D. F., Piga, L., Pisani, A., Szapudi, I., Tallada-Cresp铆, P., Aghanim, N., Andreon, S., Baccigalupi, C., Casas, S., Markovic, K., Percival, W. J., Gaztanaga, E., Nadathur, S.

27 Mar 2025, In: Astronomy and Astrophysics. 695, 22p., A232

Research output: Article

Collaboration, E., Adamek, J., Fiorini, B., Baldi, M., Brando, G., Breton, M. -., Hassani, F., Koyama, K., Brun, A. M. C. L., R谩cz, G., Winther, H. -., Casalino, A., Hern谩ndez-Aguayo, C., Li, B., Potter, D., Altamura, E., Carbone, C., Giocoli, C., Mota, D. F., Pourtsidou, A., Sakr, Z., Vernizzi, F., Amara, A., Andreon, S., Auricchio, N., Baccigalupi, C., Bardelli, S., Battaglia, P., Bonino, D., Branchini, E., Brescia, M., Brinchmann, J., Caillat, A., Camera, S., Capobianco, V., Cardone, V. F., Carretero, J., Casas, S., Castander, F. J., Castellano, M., Castignani, G., Cavuoti, S., Cimatti, A., Colodro-Conde, C., Congedo, G., Markovic, K., Percival, W. J., Gaztanaga, E., Joudaki, S., Nadathur, S.

26 Mar 2025, In: Astronomy and Astrophysics. 695, 21p., A230

Research output: Article