Seshadri Nadathur Portrait
Media ready expert

Professor Seshadri Nadathur

Professor of Cosmology

[email protected]

PhD Supervisor

View my research outputs

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

PAC in DESI. II. Galaxy–halo connection into the 106 M⊙ frontier

Xu, K., Frenk, C. S., Jing, Y. P., Cole, S., Bose, S., Aguilar, J., Ahlen, S., Bianchi, D., Brooks, D., Castander, F. J., Claybaugh, T., Macorra, A. d. l., Doel, P., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. G. A., Gutierrez, G., Hahn, C., Joyce, R., Juneau, S., Kehoe, R., Kisner, T., Landriau, M., Guillou, L. L., Manera, M., Miquel, R., Moustakas, J., Nadathur, S., Percival, W. J., Prada, F., Pérez-Ràfols, I., Rossi, G., Samushia, L., Sanchez, E., Schlegel, D., Silber, J. H., Sprayberry, D., Tarlé, G., Weaver, B. A., Zou, H.

1 Sep 2026, In: Monthly Notices of the Royal Astronomical Society. 551, 2, 40p., stag1487

Research output: Article

Weak evolution of cosmic atomic hydrogen over the past 4.5 billion years

Zhang, C., Guo, H., Gu, Y., Saintonge, A., Yang, X., Scholte, D., Jiang, P., Zou, H., Saraf, M., Ma, W., Wang, Y., Jing, Y. P., Zheng, Z., Ding, Z., Aguilar, J., Ahlen, S., Bianchi, D., Brooks, D., Claybaugh, T., Macorra, A. d. l., Doel, P., Gaztañaga, E., Gutierrez, G., Ishak, M., Joyce, R., Juneau, S., Kehoe, R., Kirkby, D., Kremin, A., Lahav, O., Lamman, C., Landriau, M., Guillou, L. L., Manera, M., Meisner, A., Miquel, R., Moustakas, J., Nadathur, S., Percival, W. J., Prada, F., Pérez-Ràfols, I., Rossi, G., Sanchez, E., Schlegel, D., Schubnell, M., Seo, H., Silber, J., Sprayberry, D., Tarlé, G., Weaver, B. A.

1 Sep 2026, In: Nature Astronomy

Research output: Article

ODIN: Confirmation and 3D Reconstruction of Six Massive Protoclusters at Cosmic Noon

Ortiz, A., Ramakrishnan, V., Lee, K., Dey, A., Guo, Y., Pinarski, E., Raichoor, A., Valdes, F., Aguilar, J., Ahlen, S., Artale, M. C., Bianchi, D., Bliese, A., Brooks, D., Canning, R., Cerdosino, M., Claybaugh, T., Cuceu, A., Macorra, A. d. l., Doel, P., Forero, J., Gawiser, E., Gaztanaga, E., Gontcho, S., Gronwall, C., Guaita, L., Gutierrez, G., Herrera-Alcantar, H. K., Hwang, H. S., Jeong, W., Joyce, D., Kehoe, R., Kisner, T., Kremin, A., Kumar, A., Lahav, O., Landriau, M., Lee, J., Lee, S., Guillou, L. L., Manera, M., Meisner, A., Miquel, R., Moon, B., Moustakas, J., Myers, A., Nadathur, S., Palanque-Delabrouille, N., Park, C., Percival, W.

1 Sep 2026, In: The Astrophysical Journal. 1008, 1, 19p., 85

Research output: Article

Luminosity Function of Quasars at 1.0 < z < 3.5 from SDSS and DESI

Yin, G., Jiang, L., Pan, Z., Martini, P., Guo, W., Zou, S., Sun, S., Panda, S., Anand, A., Weaver, B. A., Meisner, A., Cuceu, A., Dey, A., Macorra, A. d. l., Magneville, C., Brooks, D., Kirkby, D., Schlegel, D., Sprayberry, D., Bianchi, D., Joyce, D., Gaztañaga, E., Sanchez, E., Castander, F. J., Prada, F., Gutierrez, G., Rossi, G., Tarlé, G., Herrera-Alcantar, H. K., Zou, H., Pérez-Ràfols, I., Forero-Romero, J. E., Aguilar, J. N., Moustakas, J., Silber, J. H., Honscheid, K., Guillou, L. L., Manera, M., Landriau, M., Schubnell, M., Ishak, M., Palanque-Delabrouille, N., Doel, P., Miquel, R., Kehoe, R., Gontcho, S. G. A., Nadathur, S., Ferraro, S., Juneau, S., Percival, W.

1 Sep 2026, In: The Astrophysical Journal. 1008, 1, 13p., 60

Research output: Article

ODIN: Spectroscopic Validation of Lyα-Emitting Galaxy Samples with DESI

Pinarski, E., Ramgopal, G., Firestone, N., Lee, K., Gawiser, E., Dey, A., Raichoor, A., Valdes, F., Ciardullo, R., Aguilar, J. N., Ahlen, S., Bianchi, D., Brooks, D., Castander, F. J., Cerdosino, M. C., Claybaugh, T., Cuceu, A., Dawson, K. S., Macorra, A. d. l., Doel, P., Ferraro, S., Font-Ribera, A., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. G. A., Guaita, L., Gutierrez, G., Gwyn, S., Herrera-Alcantar, H. K., Hwang, H. S., Joyce, R., Juneau, S., Kehoe, R., Kirkby, D., Kisner, T., Kremin, A., Kumar, A., Lamman, C., Landriau, M., Guillou, L. L., Levi, M. E., Luo, Y., Manera, M., Martini, P., Meisner, A., Miquel, R., Moustakas, J., Myers, A. D., Nadathur, S., Percival, W. J.

1 Sep 2026, In: The Astrophysical Journal. 1008, 1, 13p., 116

Research output: Article

Euclid Quick Data Release (Q1): XL. The impact of AGN emission on SED-derived physical properties

Collaboration, E., Laloux, B., Bongiorno, A., Salvato, M., Allevato, V., Mezcua, M., Roster, W., Zatarain, T. M., Paltani, S., Shirley, R., Tarsitano, F., Saulder, C., Fotopoulou, S., Andonie, C., Buchner, J., Franca, F. L., Brun, V. L., Ricci, F., Shankar, F., Siudek, M., Sorce, J. G., Spinoglio, L., Toba, Y., Viitanen, A., Zamorani, G., Andreon, S., Auricchio, N., Baccigalupi, C., Baldi, M., Balestra, A., Bardelli, S., Battaglia, P., Biviano, A., Bolzonella, M., Branchini, E., Brescia, M., Camera, S., Cañas-Herrera, G., Capobianco, V., Carbone, C., Carretero, J., Casas, S., Castellano, M., Castignani, G., Cavuoti, S., Nichol, R. C., Percival, W. J., Gaztanaga, E., Nadathur, S., Naidoo, K.

18 Aug 2026, In: Astronomy and Astrophysics. 712, 27p., A182

Research output: Article

Euclid preparation: XCIII. Expected constraints on initial conditions

Collaboration, E., Finelli, F., Akrami, Y., Andrews, A., Ballardini, M., Casas, S., Karagiannis, D., Sakr, Z., Valiviita, J., Alestas, G., Bartolo, N., Bermejo-Climent, J. R., Nesseris, S., Paoletti, D., Sapone, D., Tutusaus, I., Achúcarro, A., Cañas-Herrera, G., Jasche, J., Lavaux, G., Aghanim, N., Altieri, B., Amara, A., Amendola, L., Andreon, S., Auricchio, N., Baccigalupi, C., Bagot, D., 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., Chambers, K. C., Cimatti, A., Colodro-Conde, C., Percival, W. J., Avila, S., Gaztanaga, E., Joudaki, S., Nadathur, S., Naidoo, K.

17 Aug 2026, In: Astronomy and Astrophysics. 712, 27p., A166

Research output: Article

Euclid preparation: XC. Calibrated intrinsic galaxy alignments in the Euclid Flagship simulation

Collaboration, E., Hoffmann, K., Paviot, R., Joachimi, B., Tessore, N., Tallada-Crespí, P., Chisari, N. E., Gonzalez, E. J., Loureiro, A., Fosalba, P., Blazek, J., Laigle, C., Dubois, Y., Pichon, C., Altieri, B., Andreon, S., Auricchio, N., Baccigalupi, C., Baldi, M., Bardelli, S., Bernardeau, F., Biviano, A., Branchini, E., Brescia, M., Camera, S., Cañas-Herrera, G., Capobianco, V., Carbone, C., Cardone, V. F., Carretero, J., Casas, S., Castander, F. 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., Silva, A. D., Degaudenzi, H., Lucia, G. D., Gaztanaga, E., Joudaki, S., Nadathur, S., Naidoo, K.

14 Aug 2026, In: Astronomy and Astrophysics. 712, 25p., A163

Research output: Article

Euclid preparation: XCII. Controlling angular systematics in the Euclid spectroscopic galaxy sample

Collaboration, E., Monaco, P., Elkhashab, M. Y., Granett, B. R., Salvalaggio, J., Sefusatti, E., Scarlata, C., Zabelle, B., Bethermin, M., Bruton, S., Carbone, C., Torre, S. d. l., Dusini, S., Eggemeier, A., Guzzo, L., Lavaux, G., Markovic, K., McCarthy, K. S., Moresco, M., Passalacqua, F., Percival, W. J., Risso, I., Sirignano, C., Altieri, B., Andreon, S., Auricchio, N., Baccigalupi, C., Baldi, M., Bardelli, S., Biviano, A., Branchini, E., Brescia, M., Brinchmann, J., Camera, S., Cañas-Herrera, G., Capobianco, V., Cardone, V. F., Carretero, J., Casas, S., Castander, F. J., Castellano, M., Castignani, G., Cavuoti, S., Cimatti, A., Colodro-Conde, C., Avila, S., Gaztanaga, E., Joudaki, S., Nadathur, S., Naidoo, K.

14 Aug 2026, In: Astronomy and Astrophysics. 712, 36p., A165

Research output: Article

Euclid preparation. Baryon acoustic oscillations extraction techniques: comparison and optimisation

Collaboration, E., Sarpa, E., Veropalumbo, A., Bonici, M., Kärcher, M., Crocce, M., Sefusatti, E., Maragliano, E., Branchini, E., Oliveri, C., Gambardella, G., Quevedo, B. C., Moretti, C., Monaco, P., Bautista, J., Viel, M., Percival, W. J., Nadathur, S., Pezzotta, A., Eggemeier, A., Bel, J., Carbone, C., Crespi, A., Radinović, S., Parimbelli, G., Farina, A., Risso, I., Guidi, M., Degni, G., Eisenstein, D., Beutler, F., García-García, C., Piccirilli, G., Sorce, J. G., Altieri, B., Andreon, S., Baccigalupi, C., Baldi, M., Bardelli, S., Battaglia, P., Biviano, A., Brescia, M., Camera, S., Gaztanaga, E., Koyama, K., Leclercq, F., Naidoo, K., Pace, F., Pattison, C., Pourtsidou, A.

6 Aug 2026, In: Astronomy and Astrophysics

Research output: Article

View all my research outputs