Seshadri Nadathur Portrait
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Professor Seshadri Nadathur

Professor of Cosmology

[email protected]

PhD Supervisor

View my research outputs
Faculty of Technology

Summary

I am Professor of Cosmology at the Institute of Cosmology and Gravitation. My research area is observational cosmology – this means I study the properties of dark energy, dark matter and gravity, using the large-scale structure of the Universe and based on galaxy survey data collected by the leading ground-based and space telescopes.

My research has been funded by the Science and Technology Facilities Council (STFC), the UK Space Agency (UKSA), and the European Commission.

Research interests

I study the large-scale structure of the Universe, analysing the statistical patterns in the distribution of millions of galaxies to uncover cosmological information. I am particularly known for my work on baryon acoustic oscillations and the development of new methods beyond two-point clustering statistics, such as cosmic voids or density-split statistics. More generally I have worked on a wide range of other areas in cosmology, including redshift-space distortions, clustering of the Lyman-alpha forest and gravitational lensing, as well as theoretical models of dark matter, dark energy and inflation.  

A large fraction of my work involves the Dark Energy Spectroscopic Instrument survey, or DESI. DESI is a 8-year spectroscopic survey programme to map the positions of 60 million galaxies and quasars in order to determine the dark energy equation of state, the neutrino mass scale, and a host of other science results. I led the Galaxy and Quasar Clustering working group in DESI from 2022-2025, when we published our major results from the first two data releases.

Another large part of my work is within the Euclid Consortium. Euclid is a space telescope, which combines spectroscopic measurements of around 30 million galaxies with weak lensing and photometric surveys of over a billion. I lead a UKSA-funded group at Portsmouth creating the spectroscopic galaxy catalogues and visibility mask for Euclid clustering science, and coordinate a DR1 Key Project on measuring baryon acoustic oscillations.

In the past I also worked on the extended Baryon Oscillation Spectroscopic Survey (eBOSS) and the Dark Energy Survey (DES).

Media availability

I am available for media requests, interviews and comments on astronomy- and cosmology-related stories. My previous contributions include appearances on The Sky At Night, a BBC4 documentary with Hannah Fry, and interviews for national and international media outlets.

I also give public lectures about cosmology in science festivals and meetings in the local area.

Research outputs

2026

The DESI Y1 RR Lyrae catalog I: Empirical modeling of the cyclic variation of spectroscopic properties and a chemodynamical analysis of the outer halo

Medina, G. E., Li, T. S., Koposov, S. E., Riley, A. H., Silva, L. B. e., Valluri, M., Wang, W., Byström, A., Gnedin, O. Y., Carlberg, R. G., Kizhuprakkat, N., Weaver, B. A., Aguilar, J., Ahlen, S., Bianchi, D., Brooks, D., Claybaugh, T., Macorra, A. d. l., Dey, A., Doel, P., Font-Ribera, A., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. G. A., Gutierrez, G., Guy, J., Honscheid, K., Ishak, M., Kisner, T., Landriau, M., Guillou, L. L., Meisner, A., Miquel, R., Myers, A. D., Nadathur, S., Poppett, C., Prada, F., Pérez-Ràfols, I., Rossi, G., Sanchez, E., Seo, H., Sprayberry, D., Tarlé, G., Wechsler, R. H., Zhou, R., Zou, H.

10 Oct 2026, In: The Astrophysical Journal. 1010, 1, 27p., 2

Research output: Article

Baryon Acoustic Oscillations from the C IV Forest with DESI DR2

Bault, A., Cuceu, A., Guy, J., Aguilar, J., Ahlen, S., Bianchi, D., Brodzeller, A., Brooks, D., Canning, R., Chaussidon, E., Claybaugh, T., de Belsunce, R., Macorra, A. d. l., Dey, A., Doel, P., Ferraro, S., Font-Ribera, A., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. G. A., Gordon, C., Gutierrez, G., Hahn, C., Herrera-Alcantar, H. K., Honscheid, K., Ishak, M., Joyce, R., Juneau, S., Kirkby, D., Kremin, A., Lamman, C., Landriau, M., Guillou, L. L., Levi, M. E., Manera, M., Martini, P., Meisner, A., Miquel, R., Moustakas, J., Muñoz-Gutiérrez, A., Nadathur, S., Palanque-Delabrouille, N., Percival, W. J., Pieri, M. M., Poppett, C., Prada, F., Pérez-Ràfols, I., Rossi, G., Sanchez, E., Schlegel, D.

10 Oct 2026, In: The Astrophysical Journal. 1010, 1, 17p., 14

Research output: Article

The composite spectrum of QSO absorption line systems in DESI DR2

Napolitano, L., Myers, A. D., Tedeschi, A., Anand, A., Herrera-Alcantar, H. K., Aguilar, J., Ahlen, S., Bailey, S., BenZvi, S., Bianchi, D., Brooks, D., Claybaugh, T., Cuceu, A., Macorra, A. d. l., Dey, A., Dey, B., Doel, P., Font-Ribera, A., Forero-Romero, J. E., Gaztanaga, E., Gontcho, S. G. A., Gutierrez, G., Guy, J., Joyce, D., Kremin, A., Landriau, M., Guillou, L. L., Manera, M., Meisner, A., Miquel, R., Moustakas, J., Nadathur, S., Palanque-Delabrouille, N., Percival, W., Prada, F., Perez-Rafols, I., Rossi, G., Sanchez, E., Schlegel, D., Schubnell, M., Silber, J. H., Sprayberry, D., Tarle, G., Weaver, B. A., Zhou, R., Zou, H.

7 Oct 2026, In: The Astrophysical Journal. 172, 5, 16p., 250

Research output: Article

Peering down the barrel with DESI DR2: 10 000+ inflows at z< 0.6 reveal how galaxies accrete cold gas

Weng, S., Saintonge, A., Pieri, M. M., Moustakas, J., Zou, H., Santos, D. M., Aguilar, J., Ahlen, S., Bianchi, D., Brooks, D., Claybaugh, T., Cuceu, A., Macorra, A. d. l., Doel, P., Font-Ribera, A., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. G. A., Gutierrez, G., Hahn, C., He, S., Honscheid, K., Hu, T., Joyce, R., Kehoe, R., Landriau, M., Guillou, L. L., Meisner, A., Miquel, R., Nadathur, S., Percival, W. J., Pérez-Ràfols, I., Rossi, G., Sanchez, E., Schlegel, D., Seo, H., Silber, J., Sprayberry, D., Tarlé, G., Weaver, B. A.

6 Oct 2026, In: Astronomy and Astrophysics. 714, 27p., A133

Research output: Article

Tracing the cosmic evolution of the cool circumgalactic medium of luminous red galaxies with DESI year 1 data

Lan, T., Prochaska, J. X., Siudek, M., Aguilar, J., Ahlen, S., Anand, A., Bianchi, D., Brooks, D., Castander, F. J., Claybaugh, T., Macorra, A. d. l., Doel, P., Ferraro, S., Font-Ribera, A., Forero-Romero, J. E., Gaztanaga, E., Gontcho, S. G. A., Gutierrez, G., Guy, J., Honscheid, K., Joyce, R., Juneau, S., Kremin, A., Lahav, O., Lamman, C., Landriau, M., Guillou, L. L., Levi, M. E., Manera, M., Meisner, A., Miquel, R., Nadathur, S., Percival, W. J., Poppett, C., Prada, F., Perez-Rafols, I., Rossi, G., Sanchez, E., Schlegel, D., Schubnell, M., Sprayberry, D., Tarle, G., Weaver, B. A., Zhou, R., Zou, H.

1 Oct 2026, In: The Astrophysical Journal. 1009, 2, 24p., 121

Research output: Article

Cosmological constraints from the DESI DR1 joint power spectrum and bispectrum analysis

Novell-Masot, S., Gil-Marín, H., Verde, L., Aguilar, J., Ahlen, S., Bianchi, D., Brooks, D., Castander, F. J., Claybaugh, T., Cole, S., Macorra, A. d. l., Costa, J. D., Ferraro, S., Font-Ribera, A., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. G. A., Gonzalez-Morales, A. X., Gutierrez, G., Guy, J., Hahn, C., Herrera-Alcantar, H. K., Honscheid, K., Howlett, C., Ishak, M., Jimenez, J., Joyce, R., Kehoe, R., Kirkby, D., Kremin, A., Lamman, C., Guillou, L. L., Manera, M., Meisner, A., Miquel, R., Nadathur, S., Niz, G., Percival, W. J., Pérez-Ràfols, I., Rossi, G., Samushia, L., Sanchez, E., Schlafly, E. F., Schlegel, D., Schubnell, M., Silber, J., Sprayberry, D., Tarlé, G., Weaver, B. A., Zhao, C.

30 Sep 2026, In: Journal of Cosmology and Astroparticle Physics. 2026, 09, 30p., 145

Research output: Article

A New Record Census of Dwarf AGN and a Bimodal MBH − M⋆ Scaling Relation with DESI DR1

Pucha, R., Juneau, S., Mezcua, M., Dey, A., Mao, Y. -., Alexander, D. M., Circosta, C., Fawcett, V. A., Guo, W., Moustakas, J., Panda, S., Siudek, M., Yu, Z., Aguilar, J., Ahlen, S., Bianchi, D., Brooks, D., Claybaugh, T., Dawson, K. S., Macorra, A. d. l., Doel, P., Ferraro, S., Font-Ribera, A., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. G. A., Gutierrez, G., Hahn, C., Honscheid, K., Joyce, R., Kehoe, R., Kisner, T., Kremin, A., Landriau, M., Guillou, L. L., Manera, M., Meisner, A., Miquel, R., Nadathur, S., Percival, W. J., Prada, F., Pérez-Ràfols, I., Rossi, G., Sanchez, E., Schlegel, D., Schubnell, M., Silber, J., Sprayberry, D., Tarlé, G., Weaver, B. A.

24 Sep 2026, In: The Astrophysical Journal. 1009, 2, 24p., 150

Research output: Article

Euclid preparation. CIX. Baryon acoustic oscillation analysis of photometric galaxy clustering in configuration space

Collaboration, E., Duret, V., Escoffier, S., Tutusaus, I., Camera, S., Tessore, N., Castander, F. J., Aghanim, N., Amara, A., Amendola, L., Andreon, S., Auricchio, N., Baccigalupi, C., Baldi, M., Bardelli, S., Battaglia, P., Biviano, A., Bonino, D., Branchini, E., Brescia, M., Brinchmann, J., Caillat, A., Cañas-Herrera, G., Capobianco, V., Carbone, C., Cardone, V. F., Carretero, J., Casas, S., Castellano, M., Castignani, G., Cavuoti, S., Chambers, K. C., Cimatti, A., Colodro-Conde, C., Congedo, G., Conselice, C. J., Conversi, L., Copin, Y., Courbin, F., Courtois, H. M., Cropper, M., Silva, A. D., Degaudenzi, H., Markovic, K., Nichol, R. C., Percival, W. J., Schewtschenko, J. A., Gaztanaga, E., Nadathur, S., Naidoo, K.

22 Sep 2026, In: Astronomy and Astrophysics. 713, 20p., A281

Research output: Article

Euclid preparation: CX. Testing template-fitting models for the multipoles of the two-point clustering of galaxy clusters

Collaboration, E., Tsaprazi, E., Fumagalli, A., Marulli, F., Heavens, A., Lesci, G. F., Romanello, M., Bolzonella, M., Sakr, Z., Altieri, B., Andreon, S., Baccigalupi, C., Baldi, M., Bardelli, S., Battaglia, P., Biviano, A., Branchini, E., Brescia, M., Camera, S., Capobianco, V., Carbone, C., Cardone, V. F., Carretero, J., Castellano, M., Castignani, G., Cavuoti, S., Chambers, K. C., Cimatti, A., Colodro-Conde, C., Congedo, G., Conversi, L., Copin, Y., Courbin, F., Courtois, H. M., Degaudenzi, H., Torre, S. d. l., Lucia, G. D., Dole, H., Dubath, F., Dupac, X., Dusini, S., Escoffier, S., Farina, M., Farinelli, R., Farrens, S., Beutler, F., Gaztanaga, E., Nadathur, S., Naidoo, K., Pattison, C.

22 Sep 2026, In: Astronomy and Astrophysics. 713, 21p., A282

Research output: Article

Euclid preparation: CV. CosmoPostProcess: A simulation calibrated framework for weak lensing selection bias in richness-selected galaxy clusters

Collaboration, E., Ingrao, R., Borgani, S., Costanzi, M., Saro, A., Castro, T., Baumont, L., Aguena, M., Grandis, S., Murray, C., Bhargava, S., Munari, E., Altieri, B., Andreon, S., Auricchio, N., Baccigalupi, C., Baldi, M., Bardelli, S., Battaglia, P., Biviano, A., Branchini, E., Brescia, M., Camera, S., Capobianco, V., Carbone, C., Carretero, J., Castellano, M., Castignani, G., Cavuoti, S., Cimatti, A., Colodro-Conde, C., Congedo, G., Conversi, L., Copin, Y., Courbin, F., Courtois, H. M., Degaudenzi, H., Lucia, G. D., Dubath, F., Dupac, X., Escoffier, S., Farina, M., Farinelli, R., Beutler, F., Gaztanaga, E., Koyama, K., Nadathur, S., Naidoo, K., Pace, F., Pattison, C.

22 Sep 2026, In: Astronomy and Astrophysics. 713, 28p., A256

Research output: Article

View all my research outputs