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

Emulating galaxy and peculiar velocity clustering on non-linear scales

Dumerchat, T., Bautista, J., Ravoux, C., Aguilar, J., Ahlen, S., BenZvi, S., Bianchi, D., Brooks, D., Claybaugh, T., Macorra, A. d. l., Doel, P., Ferraro, S., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. G. A., Gutierrez, G., Hahn, C., Howlett, C., Ishak, M., Joyce, R., Kirkby, D., Kremin, A., Lamman, C., Landriau, M., Guillou, L. L., Manera, M., 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., Zou, H.

10 Jun 2026, In: Astronomy and Astrophysics. 710, 15p., A155

Research output: Article

Highly efficient selection of high-redshift emission-line galaxies for future DESI-like surveys with deep multi-band imaging

Hernandez, Y. S., Newman, J. A., Andrews, B. H., Dey, B., Zhou, R., Sailer, N., Aguilar, J., Ahlen, S., Bianchi, D., Brooks, D., Canning, R., Castander, F. J., Chaussidon, E., Claybaugh, T., Cuceu, A., Macorra, A. d. l., Dey, A., Doel, P., Ferraro, S., Font-Ribera, A., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. G. A., Gutierrez, G., Herrera-Alcantar, H. K., Joyce, R., Juneau, S., Kehoe, R., Kirkby, D., Kisner, T., Kremin, A., Lahav, O., Lamman, C., Landriau, M., Levi, M. E., Manera, M., Meisner, A., Miquel, R., Moustakas, J., Nadathur, S., Palanque-Delabrouille, N., Percival, W. J., Prada, F., Pérez-Ràfols, I., Raichoor, A., Rossi, G., Sanchez, E., Schlegel, D., Schubnell, M., Seo, H.

5 Jun 2026, In: The Astronomical Journal. 172, 1, 15p., 11

Research output: Article

Fiducial-cosmology-dependent systematics for the DESI 2024 full-shape analysis

Gsponer, R., Ramirez-Solano, S., Rodríguez-Martínez, F., Vargas-Magaña, M., Novell-Masot, S., Findlay, N., Gil-Marín, H., Zarrouk, P., Nadathur, S., Rocher, A., Brieden, S., Pérez-Fernández, A., Aguilar, J., Ahlen, S., Bianchi, D., Brooks, D., Castander, F. J., Claybaugh, T., Cuceu, A., Macorra, A. d. l., de Mattia, A., Dey, A., Doel, P., Font-Ribera, A., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. G. A., Gutierrez, G., Guy, J., Hahn, C., Herrera-Alcantar, H. K., Honscheid, K., Howlett, C., Huterer, D., Ishak, M., Joyce, R., Kehoe, R., Kirkby, D., Kisner, T., Kremin, A., Lahav, O., Lamman, C., Landriau, M., Guillou, L. L., Levi, M. E., Magneville, C., Manera, M., Mueller, E., Percival, W. J., Samushia, L.

3 Jun 2026, In: Journal of Cosmology and Astroparticle Physics. 2026, 06, 41p., 010

Research output: Article

DESI DR2 Galaxy luminosity functions

Moore, S. G., Cole, S., Norberg, P., Moustakas, J., Aguilar, J., Ahlen, S., Anand, A., Bianchi, D., Brooks, D., Castander, F. J., Claybaugh, T., Cuceu, A., Macorra, A. d. l., Dey, A., Dey, B., Ferraro, S., Font-Ribera, A., Forero-Romero, J. E., Gaztanaga, E., Gontcho, S. G. A., Gutierrez, G., Herrera-Alcantar, H. K., Honscheid, K., Ishak, M., Joyce, R., Juneau, S., Kehoe, R., Kisner, T., Koposov, S. E., 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., Ross, A. J., Rossi, G., Sanchez, E., Schlegel, D., Schubnell, M., Seo, H., Silber, J., Sprayberry, D.

1 Jun 2026, In: Monthly Notices of the Royal Astronomical Society. 549, 2, 26p., stag866

Research output: Article

A Natural ≳100× Telescope: Discovery of the Strongly Lensed Type II SN 2025mkn at z = 1.37

Lemon, C., Goobar, A., Johansson, J., Mörtsell, E., Schulze, S., Andreoni, I., Bochenek, A., Brennan, S. J., Busmann, M., Coughlin, M., Das, K. K., Dhawan, S., Fremling, C., Gangopadhyay, A., Gruen, D., Hall, X. J., Ho, A. Y. Q., Kasliwal, M. M., Perley, D. A., Rigault, M., Schroeder, G., Smith, M., Sollerman, J., Somalwar, J. J., Stein, R., Thorp, S., Townsend, A., Wise, J. L., Yan, L., Arendse, N., Bellm, E. C., Chen, T. X., Drake, A., Masci, F. J., Purdum, J., Smith, R., Hinkle, J. T., Rivera-Thorsen, T. E., Shappee, B. J., Tucker, M. A., Aguilar, J., Ahlen, S., Aldering, G., Benzvi, S., Bianchi, D., Brooks, D., Gaztañaga, E., Manera, M., Nadathur, S., Percival, W. J.

29 May 2026, In: The Astrophysical Journal Letters. 1003, 2, 11p., L47

Research output: Article

Constraining primordial non-Gaussianity from DESI DR1 quasars and Planck PR4 CMB Lensing

Chiarenza, S., Krolewski, A., Bonici, M., Chaussidon, E., de Belsunce, R., Percival, W., Aguilar, J. N., Ahlen, S., Lizancos, A. B., Bianchi, D., Brooks, D., Claybaugh, T., Cuceu, A., Dawson, K., Macorra, A. d. l., Doel, P., Ferraro, S., Font-Ribera, A., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. G. A., Gutierrez, G., Herrera-Alcantar, H. K., Honscheid, K., Huterer, D., Ishak, M., Joyce, D., Kirkby, D., Kremin, A., Lahav, O., Lamman, C., Landriau, M., Guillou, L. L., Levi, M., Manera, M., Martini, P., Meisner, A., Miquel, R., Nadathur, S., Newman, J. A., Niz, G., Palanque-Delabrouille, N., Poppett, C., Prada, F., Pérez-Ràfols, I., Rossi, G., Sanchez, E., Schlegel, D., Schubnell, M., Seo, H.

28 May 2026, In: Journal of Cosmology and Astroparticle Physics. 2026, 05, 41p., 098

Research output: Article

Full calibration of the tomographic redshift distribution from the HSC PDR3 Shape Catalog with DESI

de Janvry, J. C., Gontcho, S. G. A., Seljak, U., Lizancos, A. B., Chaussidon, E., d'Assignies, W., DeRose, J., Heydenreich, S., Paillas, E., Valcin, D., Zhang, T., 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., Gaztañaga, E., Gutierrez, G., Herrera-Alcantar, H. K., Honscheid, K., Ishak, M., Joyce, R., Juneau, S., Kehoe, R., 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. J., Poppett, C., Prada, F., Pérez-Ràfols, I., Rossi, G., Sanchez, E., Schlegel, D.

21 May 2026, In: Journal of Cosmology and Astroparticle Physics. 2026, 05, 42p., 073

Research output: Article

Joint cosmological fits to DESI-DR1 full-shape clustering and weak gravitational lensing in configuration space

Semenaite, A., Blake, C., Porredon, A., Aguilar, J., Ahlen, S., Bianchi, D., Brooks, D., Castander, F. J., Claybaugh, T., Cuceu, A., Dawson, K. S., Macorra, A. d. l., Dey, B., Doel, P., Eggemeier, A., Elliott, A., Emas, N., Ferraro, S., Font-Ribera, A., Forero-Romero, J. E., Garcia-Quintero, C., Gaztañaga, E., Gontcho, S. G. A., Gutierrez, G., Guy, J., Hadzhiyska, B., Herrera-Alcantar, H. K., Heydenreich, S., Honscheid, K., Howlett, C., Huterer, D., Ishak, M., Joudaki, S., Joyce, R., Jullo, E., Kirkby, D., Kremin, A., Krolewski, A., Lahav, O., Lamman, C., Landriau, M., Lange, J. U., Guillou, L. L., Leauthaud, A., Levi, M. E., Manera, M., Meisner, A., Nadathur, S., Percival, W. J., Ruggeri, R.

18 May 2026, In: Open Journal of Astrophysics. 9, 28p.

Research output: Article

Extremely metal-poor galaxies in DESI DR1: connections to galaxies in the Early Universe

Sui, J., Zou, H., Scholte, D., Saintonge, A., Mezcua, M., Siudek, M., Li, W., Guo, W., Liu, S., Xiao, Y., Prada, F., Zou, S., Aguilar, J. N., Ahlen, S., Prieto, C. A., Bianchi, D., Brooks, D., Claybaugh, T., Cuceu, A., Macorra, A. d. l., Doel, P., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. G. A., Gutierrez, G., Hahn, C., Joyce, D., Kehoe, R., Landriau, M., Guillou, L. L., Luo, Y., Meisner, A., Miquel, R., Nadathur, S., Palanque-Delabrouille, N., Percival, W., Pérez-Ràfols, I., Rossi, G., Sanchez, E., Schlegel, D., Seo, H., Silber, J. H., Sprayberry, D., Tarlé, G., Weaver, B. A.

18 May 2026, In: The Astrophysical Journal. 171, 6, 14p., 351

Research output: Article

The backup program of the Dark Energy Spectroscopic Instrument's Milky Way Survey

Dey, A., Koposov, S. E., Najita, J. R., Gänsicke, B. T., Myers, A. D., Raichoor, A., Eisenstein, D. J., Schlafly, E. F., Prieto, C. A., Silva, L. B. e., Li, T. S., Valluri, M., Juneau, S., Lambert, M., Thomas, G. F., Wang, W., Riley, A. H., Kizhuprakkat, N., Aguilar, J., Ahlen, S., Bianchi, D., Brooks, D., Claybaugh, T., Cuceu, A., Macorra, A. d. l., Costa, J. D., Dey, B., Doel, P., Font-Ribera, A., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. G. A., Gutierrez, G., Guy, J., Hahn, C., Honscheid, K., Ishak, M., Jimenez, J., Kehoe, R., Kirkby, D., Kisner, T., Kremin, A., Lamman, C., Landriau, M., Guillou, L. L., Levi, M. E., Manera, M., Martini, P., Nadathur, S., Percival, W. J.

13 May 2026, In: The Astronomical Journal. 171, 6, 16p., 348

Research output: Article

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Dr Seshadri Nadathur

Summary

Research interests

Research outputs

2026