Seshadri Nadathur

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

Euclid preparation: CXII. 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.

3 Nov 2026, In: Astronomy and Astrophysics. 715, 26p., A98

Research output: Article

Unveiling Hidden Lyman Alpha Emitters in the DESI DR1 Data

Chan, J., Lan, T., Prochaska, J. X., Saito, S., Aguilar, J., Ahlen, S., Bianchi, D., Brooks, D., Cuceu, A., Macorra, A. d. l., Dey, B., Doel, P., Font-Ribera, A., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. G. A., Gutierrez, G., Hahn, C., Jimenez, J., Joyce, R., Juneau, S., Kirkby, D., Kremin, A., Landriau, M., Manera, M., Meisner, A., Miquel, R., Moustakas, J., Nadathur, S., Percival, W. J., Poppett, C., Prada, F., Pérez-Ràfols, I., Rossi, G., Sanchez, E., Schlegel, D., Schubnell, M., Silber, J., Sprayberry, D., Tarlé, G., Weaver, B. A., Zou, H.

1 Nov 2026, In: The Astrophysical Journal. 1011, 1, 23p., 110

Research output: Article

Precision kinematic Sunyaev-Zel’dovich measurements across halo mass and redshift with DESI DR2 and ACT DR6. I. Luminous red galaxies

Qu, F. J., Guachalla, B. R., Schaan, E., Hadzhiyska, B., Ferraro, S., Aguilar, J., Ahlen, S., Lizancos, A. B., Bianchi, D., Brooks, D., Canning, R., Castander, F. J., Chaussidon, E., Claybaugh, T., Cuceu, A., Macorra, A. d. l., Dey, B., Doel, P., Font-Ribera, A., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. G. A., Gutierrez, G., Herrera-Alcantar, H. K., Honscheid, K., Howlett, C., Huterer, D., Ishak, M., Kehoe, R., Kisner, T., Kremin, A., Lahav, O., Landriau, M., Guillou, L. L., Levi, M. E., Manera, M., Meisner, A., Miquel, R., Nadathur, S., Percival, W. J., P'erez-R`afols, I., Rossi, G., Samushia, L., Sanchez, E., Schlafly, E. F., Schlegel, D., Schubnell, M., Seo, H., Silber, J.

29 Oct 2026, In: Physical Review D. 114, 44p., 083540

Research output: Article

Precision kinematic Sunyaev-Zel’dovich measurements across halo mass and redshift with DESI DR2 and ACT DR6. II. Bright galaxy survey and emission-line galaxies

Hadzhiyska, B., Ferraro, S., Qu, F. J., Guachalla, B. R., Schaan, E., Aguilar, J., Ahlen, S., Bianchi, D., Brooks, D., Castander, F. J., Chaussidon, E., Claybaugh, T., Macorra, A. d. l., Dey, A., Dey, B., Doel, P., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. G. A., Gutierrez, G., Guy, J., Honscheid, K., Howlett, C., Huterer, D., Ishak, M., Joyce, R., Kehoe, R., Kisner, T., Kremin, A., Lahav, O., Landriau, M., Guillou, L. L., Leauthaud, A., Manera, M., Martini, P., Meisner, A., Miquel, R., Nadathur, S., Palanque-Delabrouille, N., Percival, W. J., Prada, F., Pérez-Ràfols, I., Rossi, G., Samushia, L., Sanchez, E., Schlafly, E. F., Schlegel, D., Silber, J., Sprayberry, D., Tarlé, G.

29 Oct 2026, In: Physical Review D. 114, 28p., 083541

Research output: Article

The linear point standard ruler with DESI DR1 and DR2 data

Uberoi, N., Nikakhtar, F., Padmanabhan, N., Sheth, R. K., Aguilar, J., Ahlen, S., Bianchi, D., Brooks, D., Castander, F. J., Claybaugh, T., Cuceu, A., Macorra, A. d. l., Dey, A., Dey, B., Doel, P., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. G. A., Gutierrez, G., Honscheid, K., Howlett, C., Ishak, M., Joyce, R., Kirkby, D., Kisner, T., Lahav, O., Lamman, C., Landriau, M., Guillou, L. L., Manera, M., Martini, P., Meisner, A., Miquel, R., Nadathur, S., Percival, W. J., Poppett, C., Prada, F., Pérez-Ràfols, I., Rossi, G., Samushia, L., Sanchez, E., Schlegel, D., Schubnell, M., Silber, J., Sprayberry, D., Tarlé, G., Weaver, B. A., Zou, H.

26 Oct 2026, In: Journal of Cosmology and Astroparticle Physics. 2026, 10, 47p., 068

Research output: Article

Improved constraints on the Milky Way potential using the M68 stream and DESI spectroscopic data

Palau, C. G., Wang, W., Han, J., Aguilar, J., Ahlen, S., Beutler, F., Bianchi, D., Brooks, D., Rosell, A. C., Castander, F. J., Claybaugh, T., Cuceu, A., Macorra, A. d. l., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. G. A., Gutierrez, G., Guy, J., Kirkby, D., Kremin, A., Landriau, M., Guillou, L. L., Leauthaud, A., Medina, G. E., Meisner, A., Miquel, R., Nadathur, S., Noriega, H. E., Paillas, E., Palanque-Delabrouille, N., Percival, W. J., Prada, F., Pérez-Ràfols, I., Ravoux, C., Rossi, G., Ruggeri, R., Sanchez, E., Saulder, C., Schlegel, D., Schubnell, M., Siudek, M., Tarlé, G., Weaver, B. A., Zou, H.

22 Oct 2026, In: Monthly Notices of the Royal Astronomical Society

Research output: Article

Systematic uncertainties on DESI Tully-Fisher distances constrained with Integral Field Spectroscopy

Siwakoti, U., Galbany, L., Douglass, K. A., Amsellem, A. J., Weaver, B. A., Aguilar, J. N., Ahlen, S., Bianchi, D., Brooks, D., Claybaugh, T., Macorra, A. d. l., Doel, P., Ferraro, S., Forero-Romero, J. E., Gaztanaga, E., Gontcho, S. G. A., Gutierrez, G., Hahn, C., Honscheid, K., Howlett, C., Huterer, D., Joyce, R., Juneau, S., Kehoe, R., Kisner, T., Kremin, A., Landriau, M., Guillou, L. L., Manera, M., Miquel, R., Moustakas, J., Nadathur, S., Percival, W. J., Perez-Rafols, I., Prada, F., Rossi, G., Sanchez, E., Schlegel, D., Silber, J. H., Sprayberry, D., Tarle, G., Zou, H.

19 Oct 2026, In: Astronomy and Astrophysics. 714, 17p., A325

Research output: Article

Euclid preparation: CXI. 6x2 pt analysis of Euclid's spectroscopic and photometric data sets

Collaboration, E., Paganin, L., Bonici, M., Carbone, C., Camera, S., Tutusaus, I., Davini, S., Bel, J., Tosi, S., Sciotti, D., Domizio, S. D., Risso, I., Testera, G., Sapone, D., Sakr, Z., Amara, A., Andreon, S., Auricchio, N., Baccigalupi, C., Baldi, M., Bardelli, S., Battaglia, P., Bender, R., Bernardeau, F., Bodendorf, C., Bonino, D., Branchini, E., Brescia, M., Brinchmann, J., Capobianco, V., Cardone, V. F., Carretero, J., Casas, S., Castellano, M., Castignani, G., Cavuoti, S., Cimatti, A., Colodro-Conde, C., Congedo, G., Conselice, C. J., Conversi, L., Copin, Y., Corcione, L., Costille, A., Courbin, F., Courtois, H. M., Markovic, K., Percival, W. J., Gaztanaga, E., Nadathur, S.

16 Oct 2026, In: Astronomy and Astrophysics. 714, 30p., A342

Research output: Article

Cosmological Constraints from Full-Scale Clustering and Galaxy-Galaxy Lensing with DESI DR1

Lange, J. U., Wells, A., Hearin, A., Beltz-Mohrmann, G., Leauthaud, A., Heydenreich, S., Blake, C., Aguilar, J. N., Ahlen, S., Anand, A., Bianchi, D., Brooks, D., Castander, F. J., Claybaugh, T., Cole, S., Cuceu, A., Dawson, K., Macorra, A. d. l., Dey, B., Doel, P., Elliott, A., Emas, N. P. A. P., Ferraro, S., Font-Ribera, A., Forero-Romero, J. E., Garcia-Quintero, C., Gaztañaga, E., Gontcho, S. G. A., Gutierrez, G., Guy, J., Honscheid, K., Huterer, D., Ishak, M., Joudaki, S., Joyce, D., Kehoe, R., Kirkby, D., Kisner, T., Kremin, A., Krolewski, A., Lahav, O., Lamman, C., Landriau, M., Guillou, L. L., Levi, M., Manera, M., Mueller, E., Nadathur, S., Percival, W., Ruggeri, R.

15 Oct 2026, In: The Astrophysical Journal. 1010, 2, 14p., 170

Research output: Article

Clustering of high-redshift quasars with DESI DR2

Charles, M., Martini, P., Ross, A. J., Weinberg, D. H., Aguilar, J., Ahlen, S., Bianchi, D., Brooks, D., Castander, F. J., Claybaugh, T., Cuceu, A., Macorra, A. d. l., Doel, P., Ferraro, S., Font-Ribera, A., Forero-Romero, J. E., Gontcho, S. G. A., Gutierrez, G., Guy, J., Hahn, C., Herrera-Alcantar, H. K., Honscheid, K., Howlett, C., Ishak, M., Joyce, R., Kirkby, D., Kremin, A., Landriau, M., Guillou, L. L., Levi, M. E., Manera, M., Meisner, A., Miquel, R., Moustakas, J., Myers, A. D., Nadathur, S., Palanque-Delabrouille, N., Percival, W. J., Prada, F., Pérez-Ràfols, I., Rossi, G., Samushia, L., Sanchez, E., Schlegel, D., Schubnell, M., Sprayberry, D., Tarlé, G., Weaver, B. A., Zhou, R.

14 Oct 2026, In: Journal of Cosmology and Astroparticle Physics. 2026, 10, 41p., 035

Research output: Article

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Professor Seshadri Nadathur

Summary

Research interests

Media availability

Research outputs

2026