Seshadri Nadathur

Summary

I am Associate Professor in Cosmology and an Ernest Rutherford Fellow 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 is funded by the Science and Technology Facilities Council (STFC) and previously by the European Commission.

Research interests

I study the large-scale structure of the Universe, analysing the statistical patterns in the clustering of millions of galaxies to uncover cosmological information. I work on redshift-space distortions, baryon acoustic oscillations, gravitational lensing and cross-correlations with the cosmic microwave background anisotropies, and I am particularly interested in the use of new cosmological probes beyond two-point clustering statistics, such as cosmic voids or density-split statistics.

A large fraction of my work involves the Dark Energy Spectroscopic Instrument survey, or DESI. DESI is a 5-year spectroscopic survey programme to map the positions of 40 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 have led the Galaxy and Quasar Clustering working group in DESI since 2022.

Another large part of my work is within the Euclid Consortium. Euclid is a space telescope, launched in 2023, which combines spectroscopic measurements of around 30 million galaxies with weak lensing and photometric surveys of over a billion. I am the PI of a UK Space Agency grant at Portsmouth funding our work on the Euclid Science Ground Segment infrastructure development, and lead a group creating the spectroscopic galaxy catalogues and visibility mask for clustering science. I am also coordinator for a 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).

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.

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

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

Euclid: VIII. Populating a dark universe with galaxies using SciPIC

Collaboration, E., Gonzalez, E. J., Carretero, J., Baghkhani, Z., Castander, F. J., Fosalba, P., Tallada-Crespí, P., Stadel, J., Potter, D., Tutusaus, I., Ramakrishnan, S., van Heukelum, M. L., Chisari, N. E., Marulli, F., Bolzonella, M., Pozzetti, L., Navarro-Gironés, D., Chaves-Montero, J., Parimbelli, G., Manera, M., Blot, L., Hoffmann, K., Huertas-Company, M., Monaco, P., Scarlata, C., Breton, M. -., Teyssier, R., Crocce, M., Congedo, G., Biviano, A., Hirschmann, M., Pezzotta, A., Hoekstra, H., Percival, W. J., Oesch, P. A., Bowler, R. A. A., Gonzalez-Perez, V., Avila, S., Kovács, A., Altieri, B., Andreon, S., Auricchio, N., Casas, S., Beutler, F., Gaztanaga, E., Koyama, K., Nadathur, S., Naidoo, K., Pace, F., Pattison, C.

6 Aug 2026, In: Astronomy and Astrophysics. 712, 24p., A90

Research output: Article

Frequentist cosmological constraints from full-shape clustering measurements in DESI DR1

Morawetz, J., Zhang, H., Bonici, M., Percival, W., Crespi, A., Aguilar, J. N., Ahlen, S., Bianchi, D., Brooks, D., Castander, F. J., Claybaugh, T., Cole, S., Cuceu, A., Macorra, A. d. l., de Mattia, A., Dey, B., Doel, P., Ferraro, S., Font-Ribera, A., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. G. A., Gutierrez, G., Hahn, C., Honscheid, K., Huterer, D., Ishak, M., Joyce, D., Kehoe, R., Kirkby, D., Kisner, T., Lahav, O., Lambert, A., Landriau, M., Guillou, L. L., Manera, M., Miquel, R., Mueller, E., Nadathur, S., Newman, J. A., Niz, G., Palanque-Delabrouille, N., Prada, F., Pérez-Ràfols, I., Rossi, G., Samushia, L., Sanchez, E., Schlegel, D., Schubnell, M., Silber, J. H.

3 Aug 2026, In: Journal of Cosmology and Astroparticle Physics. 2026, 08, 28p., 001

Research output: Article

Quasars acting as Strong Lenses Found in DESI DR1

McArthur, E., Millon, M., Powell, M., Wechsler, R. H., Pan, Z., Siudek, M., Spiller, J., Aguilar, J. N., Ahlen, S., Anand, A., BenZvi, S., Bianchi, D., Brooks, D., Claybaugh, T., Cuceu, A., Macorra, A. d. l., Dey, A., Doel, P., Font-Ribera, A., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. G. A., Gutierrez, G., Herrera-Alcantar, H. K., Honscheid, K., Ishak, M., Joyce, D., Juneau, S., Kirkby, D., Kisner, T., Kremin, A., Lahav, O., Lamman, C., Landriau, M., Guillou, L. L., Manera, M., Meisner, A., Miquel, R., Nadathur, S., Palanque-Delabrouille, N., Percival, W., Poppett, C., Prada, F., Pérez-Ràfols, I., Rossi, G., Sanchez, E., Schlegel, D., Schubnell, M., Seo, H., Silber, J. H.

1 Aug 2026, In: The Astrophysical Journal. 1006, 2, 14p., 147

Research output: Article

Versus: An excursion-set-inspired void-finder for the Stage-IV era

Findlay, N., Nadathur, S.

29 Jul 2026, In: Monthly Notices of the Royal Astronomical Society

Research output: Article

Stacked Reverberation Mapping of High Redshift Quasars in DESI. I. Feasibility Analysis

Alfarsy, R., Canning, R. E. A., Mueller, E., Aguilar, J., Ahlen, S., Bianchi, D., Brooks, D., Clark, P., Claybaugh, T., Cuceu, A., Davis, T., Macorra, A. d. l., Dhavala, S., Fawcett, V. A., Floyd, B., Font-Ribera, A., Forero-Romero, J., Gaztañaga, E., Guo, W., Gutierrez, G., Honscheid, K., Joyce, R., Juneau, S., Kirkby, D., Kisner, T., Kremin, A., Lamman, C., Landriau, M., Guillou, L. L., Martini, P., McDougall, H., Meisner, A., Miquel, R., Moustakas, J., Nadathur, S., Palanque-Delabrouille, N., Pan, Z., Panda, S., Pérez-Ràfols, I., Prada, F., Pucha, R., Rossi, G., Sanchez, E., Schlegel, D., Schubnell, M., Shanks, T., Siudek, M., Sprayberry, D., Tarlé, G., Weaver, B. A.

28 Jul 2026, In: Monthly Notices of the Royal Astronomical Society

Research output: Article

Euclid Quick Data Release (Q1): XXXVIII. Euclid spectroscopy of quasars. 1. Identification and redshift determination of 3500 bright quasars

Collaboration, E., Fu, Y., Bouwens, R., Caputi, K. I., Vergani, D., Scialpi, M., Margalef-Bentabol, B., Bolzonella, M., Banerji, M., Bañados, E., Feltre, A., Toba, Y., Calhau, J., Tarsitano, F., Cunha, P. A. C., Humphrey, A., Vietri, G., Mannucci, F., Bisogni, S., Ricci, F., Landt, H., Spinoglio, L., Zatarain, T. M., Stern, D., Alexander, D. M., Zamorani, G., Roster, W., Salvato, M., Copin, Y., Sorce, J. G., Lusso, E., Wolf, J., Yang, D., Rottgering, H. J. A., Laloux, B., Siudek, M., Belladitta, S., Liu, Q., Allevato, V., Andreon, S., Auricchio, N., Baccigalupi, C., Baldi, M., Casas, S., Markovic, K., Nichol, R. C., Percival, W. J., Gaztanaga, E., Nadathur, S., Naidoo, K.

23 Jul 2026, In: Astronomy and Astrophysics, 24p., A285

Research output: Article

The DESI DR1 Peculiar Velocity Survey: Fundamental Plane Catalogue

Howlett, C., Lucey, J. R., Said, K., Davis, T. M., Aguilar, J., Ahlen, S., Amsellem, A. J., Bautista, J., Benzvi, S., Bianchi, D., Blake, C., Brooks, D., Carr, A., Claybaugh, T., Cuceu, A., De La Macorra, A., Dey, B., Doel, P., Douglass, K., Ferraro, S., Font-Ribera, A., Forero-Romero, J. E., Gaztañaga, E., Gontcho A Gontcho, S., Gutierrez, G., Guy, J., Honscheid, K., Huterer, D., Ishak, M., Joyce, R., Kim, A. G., Kremin, A., Lahav, O., Lamman, C., Landriau, M., Le Guillou, L., Leauthaud, A., Levi, M. E., Martini, P., Meisner, A., Miquel, R., Moustakas, J., Muñoz-Gutiérrez, A., Nadathur, S., Palanque-Delabrouille, N., Percival, W. J., Poppett, C., Prada, F., Pérez-Ràfols, I., Qin, F.

6 Jul 2026, In: Publications of the Astronomical Society of Australia

Research output: Article

The kinematically hot, extremely metal-poor C-19 stellar stream in DESI DR2

Mohammed, N., Tang, J. Y., Li, T. S., Koposov, S. E., Carlberg, R. G., Jarvis, E., Li, A. P., Sandford, N., Medina, G. E., Wang, W., Valluri, M., Riley, A. H., Silva, L. B. e., Najita, J., Lambert, M., Li, S., Aguilar, J., Ahlen, S., Bianchi, D., Brooks, D., Claybaugh, T., Macorra, A. d. l., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. G. A., Gutierrez, G., Joyce, R., Juneau, S., 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., Silber, J., Sprayberry, D., Tarlé, G., Weaver, B. A., Zhou, R., Zou, H.

6 Jul 2026, In: The Astrophysical Journal. 1005, 2, 20p., 200

Research output: Article

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Dr Seshadri Nadathur

Summary

Research interests

Research outputs

2026