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

A new way to discover strong gravitational lenses: Pair-wise Spectroscopic Search from DESI DR1

Hsu, Y., Huang, X., Storfer, C. J., Inchausti, J. C., Schlegel, D., Moustakas, J., Aguilar, J., Ahlen, S., Anand, A., Bianchi, D., Brooks, D., Castander, F. J., Claybaugh, T., Cuceu, A., Macorra, A. d. l., Costa, J. D., Dey, A., Dey, B., Doel, P., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. G. A., Gutierrez, G., Huterer, D., Joyce, R., Kehoe, R., Kirkby, D., Kisner, T., Kremin, A., Lahav, O., Landriau, M., Guillou, L. L., Manera, M., Meisner, A., Miquel, R., Nadathur, S., Palanque-Delabrouille, N., Percival, W. J., Prada, F., Pérez-Ràfols, I., Rossi, G., Sanchez, E., Schubnell, M., Silber, J., Sprayberry, D., Tarlé, G., Weaver, B. A., Zhou, R., Zou, H.

23 Jan 2026, In: The Astrophysical Journal. 282, 19p., 41

Research output: Article

Validation of the DESI DR2 Lyα BAO analysis using synthetic datasets

Casas, L., Herrera-Alcantar, H. K., Chaves-Montero, J., Cuceu, A., Font-Ribera, A., Lokken, M., Karim, M. A., Ramírez-Pérez, C., Aguilar, J., Ahlen, S., Andrade, U., Armengaud, E., Aviles, A., BenZvi, S., Bianchi, D., Brodzeller, A., Brooks, D., Canning, R., Rosell, A. C., Charles, M., Chaussidon, E., Claybaugh, T., Dawson, K. S., Macorra, A. d. l., de Mattia, A., Dey, A., Dey, B., Ding, Z., Doel, P., Eisenstein, D. J., Elbers, W., Ferraro, S., Forero-Romero, J. E., Garcia-Quintero, C., Garrison, L. H., Gaztañaga, E., Gil-Marín, H., Gontcho, S. G. A., Gonzalez-Morales, A. X., Gordon, C., Gutierrez, G., Guy, J., Herbold, M., Honscheid, K., Howlett, C., Huterer, D., Manera, M., Nadathur, S., Percival, W. J., Pieri, M. M.

16 Jan 2026, In: Physical Review D. 113, 2, 24p., 023520

Research output: Article

Identifying Anomalous DESI Galaxy Spectra with a Variational Autoencoder

Nicolaou, C., Nathan, R. P., Lahav, O., Palmese, A., Saintonge, A., Aguilar, J., Ahlen, S., Prieto, C. A., BenZvi, S., Bianchi, D., Brodzeller, A., Brooks, D., Claybaugh, T., Macorra, A. d. l., Costa, J. D., Dey, A., Doel, P., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. G. A., Gutierrez, G., Honscheid, K., Howlett, C., Ishak, M., Kehoe, R., Kirkby, D., Kisner, T., Kremin, A., Lambert, A., Landriau, M., Guillou, L. L., Meisner, A., Miquel, R., Moustakas, J., Nadathur, S., Prada, F., Pérez-Ràfols, I., Rossi, G., Sanchez, E., Schubnell, M., Siudek, M., Sprayberry, D., Tarlé, G., Weaver, B. A., Zou, H.

7 Jan 2026, In: Monthly Notices of the Royal Astronomical Society

Research output: Article

The Compilation and Validation of the Spectroscopic Redshift Catalogs for the DESI-COSMOS and DESI-XMMLSS Fields

Ratajczak, J., Dawson, K. S., Weaverdyck, N., Aguilar, J., Ahlen, S., Armengaud, E., Bianchi, D., Blanco, D., Brodzeller, A., Brooks, D., Castander, F. J., 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., Guy, J., Hagen, T., Herrera-Alcantar, H. K., Honscheid, K., Huterer, D., Ishak, M., Jimenez, J., Joyce, R., Juneau, S., Kehoe, R., Kirkby, D., Kisner, T., Koposov, S. E., Kremin, A., Lahav, O., Lambert, A., Lamman, C., Landriau, M., Guillou, L. L., Leauthaud, A., Levi, M. E., Li, Q., Longhurst, I., Luo, Y., Manera, M., Martini, P., McCullough, J., Nadathur, S., Percival, W. J.

6 Jan 2026, In: The Astrophysical Journal. 171, 2, 37p., 71

Research output: Article

Modelling the impact of quasar redshift errors on the full-shape analysis of correlations in the Lyman-α forest

Gordon, C., Cuceu, A., Font-Ribera, A., Herrera-Alcantar, H. K., Aguilar, J. N., Ahlen, S., Bianchi, D., Brooks, D., Claybaugh, T., Cole, S., Macorra, A. d. l., Dey, B., Doel, P., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. G. A., Gutierrez, G., Guy, J., Honscheid, K., Ishak, M., Kehoe, R., Kirkby, D., Kisner, T., Kremin, A., Landriau, M., Guillou, L. L., Levi, M., Manera, M., Martini, P., Miquel, R., Moustakas, J., Nadathur, S., Niz, G., Palanque-Delabrouille, N., Percival, W., Prada, F., Pérez-Ràfols, I., Rossi, G., Sanchez, E., Schlegel, D., Schubnell, M., Seo, H., Silber, J. H., Sprayberry, D., Tarlé, G., Weaver, B. A., Zhou, R., Zou, H.

1 Jan 2026, In: Monthly Notices of the Royal Astronomical Society, 19p., staf2035

Research output: Article

2025

The Lyman-α Forest from LBGs: First 3D Correlation Measurement with DESI and Prospects for Cosmology

Herrera-Alcantar, H. K., Armengaud, E., Yèche, C., Gordon, C., Casas, L., Font-Ribera, A., Magneville, C., Ravoux, C., Aguilar, J., Ahlen, S., Anand, A., Brooks, D., Chaussidon, E., Claybaugh, T., Cuceu, A., Dawson, K. S., Macorra, A. d. l., Doel, P., Ferraro, S., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. G. A., Gonzalez-Morales, A. X., Gutierrez, G., Guy, J., Hahn, C., Kirkby, D., Kremin, A., Lahav, O., Lambert, A., Landriau, M., Guillou, L. L., Manera, M., Martini, P., Meisner, A., Miquel, R., Muñoz-Gutiérrez, A., Nadathur, S., Palanque-Delabrouille, N., 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.

22 Dec 2025, In: Journal of Cosmology and Astroparticle Physics. 2025, 12, 38p., 053

Research output: Article

DESI Spectroscopy of HETDEX Emission-line Candidates I: Line Discrimination Validation

Landriau, M., Cooper, E. M., Davis, D., Gebhardt, K., Ciardullo, R., Armengaud, É., Dey, A., Raichoor, A., Schlegel, D. J., Aguilar, J., Ahlen, S., Bianchi, D., Brooks, D., Claybaugh, T., Macorra, A. d. l., Ferraro, S., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. G. A., Gutierrez, G., Hahn, C., Honscheid, K., Howlett, C., Ishak, M., Juneau, S., Kehoe, R., Kisner, T., Kremin, A., Guillou, L. L., Levi, M. E., Manera, M., Meisner, A., Miquel, R., Moustakas, J., Nadathur, S., Pérez-Ràfols, I., Poppett, C., Prada, F., Rossi, G., Sanchez, E., Schubnell, M., Sprayberry, D., Tarlé, G., Weaver, B. A., Zhou, R., Zou, H., Farrow, D. J., Hill, G. J., Jeong, D., Liu, C.

19 Dec 2025, In: The Astrophysical Journal. 995, 2, 13p., 220

Research output: Article

Euclid preparation: LXXVI. Simulating thousands of Euclid spectroscopic skies

Collaboration, E., Monaco, P., Parimbelli, G., Elkhashab, M. Y., Salvalaggio, J., Castro, T., Lepinzan, M. D., Sarpa, E., Sefusatti, E., Stanco, L., Tornatore, L., Addison, G. E., Bruton, S., Carbone, C., Castander, F. J., Carretero, J., Torre, S. d. l., Fosalba, P., Lavaux, G., Markovic, K., McCarthy, K. S., Passalacqua, F., Percival, W. J., Risso, I., Scarlata, C., Tallada-Crespí, P., Viel, M., Altieri, B., Andreon, S., Auricchio, N., Baccigalupi, C., Baldi, M., Bardelli, S., Battaglia, P., Bernardeau, F., Biviano, A., Branchini, E., Brescia, M., Brinchmann, J., Camera, S., Cañas-Herrera, G., Capobianco, V., Cardone, V. F., Casas, S., Castellano, M., Avila, S., Gaztanaga, E., Joudaki, S., Nadathur, S., Naidoo, K.

17 Dec 2025, In: Astronomy and Astrophysics. 704, 19p., A306

Research output: Article

Study of the Connected Four-Point Correlation Function of Galaxies from DESI Data Release 1 Luminous Red Galaxy Sample

Hou, J., Cahn, R. N., Aguilar, J., Ahlen, S., Bianchi, D., Brooks, D., Claybaugh, T., Doel, P., Ferraro, S., Forero-Romero, J. E., Gaztañaga, E., Guillou, L. L., Gutierrez, G., Honscheid, K., Huterer, D., Ishak, M., Joyce, R., Juneau, S., Kehoe, R., Kirkby, D., Kisner, T., Kremin, A., Lamman, C., Landriau, M., Macorra, A. d. l., Manera, M., de Mattia, A., Miquel, R., Mueller, E., Nadathur, S., Niz, G., Percival, W. J., Prada, F., Pérez-Ràfols, I., Ross, A. J., Rossi, G., Sanchez, E., Schlegel, D., Schubnell, M., Seo, H., Silber, J., Slepian, Z., Sprayberry, D., Tarlé, G., Weaver, B. A., Zou, H.

15 Dec 2025, In: Physical Review D. 112, 25p., 122005

Research output: Article

Galaxy-Multiplet Clustering from DESI DR2

Wang, H., Eisenstein, D. J., Aguilar, J. N., Ahlen, S., Bianchi, D., Brooks, D., Claybaugh, T., Macorra, A. d. l., Dey, A., Dey, B., Doel, P., Ferraro, S., Font-Ribera, A., Forero-Romero, J. E., Gaztañaga, E., Gutierrez, G., Honscheid, K., Ishak, M., Joyce, R., Juneau, S., Kirkby, D., Kisner, T., Kremin, A., Lahav, O., Lamman, C., Landriau, M., Manera, M., Meisner, A., Miquel, R., Mueller, E., Nadathur, S., Niz, G., Palanque-Delabrouille, N., Percival, W. J., Prada, F., Pérez-Ràfols, I., Ross, A. J., Rossi, G., Sanchez, E., Schlegel, D., Schubnell, M., Silber, J. H., Sprayberry, D., Tarlé, G., Weaver, B. A., Zhou, R., Zou, H.

2 Dec 2025, In: Monthly Notices of the Royal Astronomical Society

Research output: Article

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Dr Seshadri Nadathur

Summary

Research interests

Research outputs

2026

2025