Seshadri Nadathur | University of Portsmouth

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

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

Extensive analysis of reconstruction algorithms for DESI 2024 baryon acoustic oscillations

Chen, X., Ding, Z., Paillas, E., Nadathur, S., Seo, H., Chen, S., Padmanabhan, N., White, M., Mattia, A. d., McDonald, P., Ross, A. J., Variu, A., Rosell, A. C., Hadzhiyska, B., Hanif, M. M. S., Forero-Sánchez, D., Ahlen, S., Alves, O., Andrade, U., BenZvi, S., Bianchi, D., Brooks, D., Chaussidon, E., Claybaugh, T., Macorra, A. d. l., Dey, B., Fanning, K., Ferraro, S., Font-Ribera, A., Forero-Romero, J. E., Garcia-Quintero, C., Gaztañaga, E., Gontcho, S. G. A., Gutierrez, G., Hahn, C., Honscheid, K., Juneau, S., Kehoe, R., Kirkby, D., Kisner, T., Kremin, A., Levi, M. E., Meisner, A., Mena-Fernández, J., Miquel, R., Moustakas, J., Muñoz-Gutiérrez, A., Nikakhtar, F., Percival, W. J., Ruggeri, R.

5 May 2026, In: Journal of Cosmology and Astroparticle Physics. 2026, 05, 58p., 001

Research output: Article

DESI DR2 reference mocks: clustering results from Uchuu-BGS and LRG

Fernández-García, E., Prada, F., DeRose, J., Ross, A. J., Wang, M. S., Ding, Z., Guandalin, C., Lamman, C., Vaisakh, R., Kehoe, R., Lasker, J., Ishiyama, T., Cole, S., Siudek, M., Amalbert, A., Salcedo, A., Hearin, A., Joachimi, B., Rocher, A., Saito, S., Krolewski, A., Slepian, Z., Li, Q., Dawson, K. S., Jullo, E., Aguilar, J., Ahlen, S., Bianchi, D., Brooks, D., Claybaugh, T., Macorra, A. d. l., Doel, P., Ferraro, S., Font-Ribera, A., Forero-Romero, J. E., Gontcho, S. G. A., Gutierrez, G., Honscheid, K., Ishak, M., Joyce, R., Juneau, S., Kirkby, D., Kisner, T., Kremin, A., Lahav, O., Lambert, A., Landriau, M., Manera, M., Nadathur, S., Percival, W. J.

5 May 2026, In: Physical Review D. 2026, 05, 34p., 002

Research output: Article

Probing the limits of cosmological information from the Lyman-α forest 2-point correlation functions

Turner, W., Cuceu, A., Martini, P., Aguilar, J., Ahlen, S., Anand, A., Bianchi, D., Brooks, D., Casas, L., Claybaugh, T., Macorra, A. d. l., Dey, B., 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., Ishak, M., Joyce, R., Kehoe, R., Kirkby, D., Kremin, A., Lahav, O., Landriau, M., Guillou, L. L., Manera, M., Miquel, R., Muñoz-Gutiérrez, A., Nadathur, S., Niz, G., Palanque-Delabrouille, N., Percival, W. J., Poppett, C., Prada, F., Ross, A. J., Rossi, G., Sanchez, E., Schlegel, D., Schubnell, M., Seo, H., Silber, J., Sprayberry, D., Tarlé, G., Walther, M., Weaver, B. A., Zhou, R.

5 May 2026, In: Journal of Cosmology and Astroparticle Physics. 2026, 05, 33p., 010

Research output: Article

Euclid structural-thermal-optical performance

Collaboration, E., Anselmi, A., Laureijs, R., Racca, G. D., Costa, G., Mifsud, L. C., Cuillandre, J. -., Gottero, M., Hoekstra, H., Kuijken, K., Mareschi, V., Miller, L., Mottini, S., Stramaccioni, D., Altieri, B., Amara, A., Andreon, S., Auricchio, N., Baccigalupi, C., Baldi, M., Balestra, A., Bardelli, S., Bender, R., Biviano, A., Branchini, E., Brescia, M., Camera, S., Canas-Herrera, G., Capobianco, V., Carbone, C., Carretero, J., Castellano, M., Castignani, G., Cavuoti, S., Cimatti, A., Colodro-Conde, C., Congedo, G., Conselice, C. J., Conversi, L., Copin, Y., Courbin, F., Courtois, H. M., Cropper, M., Silva, A. D., Degaudenzi, H., Nichol, R. C., Percival, W. J., Gaztanaga, E., Nadathur, S., Naidoo, K.

5 May 2026, In: Astronomy and Astrophysics. 709, 21p., A15

Research output: Article

Parity-odd four-point correlation function 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., Forero-Romero, J. E., Gaztañaga, E., Guillou, L. L., Gutierrez, G., Howlett, C., Ishak, M., Joyce, R., Kremin, A., Lahav, O., Lamman, C., Landriau, M., Macorra, A. d. l., Miquel, R., Nadathur, S., Niz, G., 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., Zou, H.

4 May 2026, In: Physical Review D. 113, 20p., 103502

Research output: Article

Inference of the linear matter power spectrum at z = 0 using DESI DR1 Full-Shape data

Cereskaite, R., Mueller, E., Howlett, C., Davis, T. M., Aguilar, J., Ahlen, S., Bianchi, D., Brooks, D., Castander, F. J., Claybaugh, T., Cuceu, A., Macorra, A. d. l., Ferraro, S., Font-Ribera, A., Forero-Romero, J. E., Gaztanaga, E., Gutierrez, G., Hahn, C., Honscheid, K., Huterer, D., Ishak, M., Joyce, R., Juneau, S., Kirkby, D., Kremin, A., Lahav, O., Lambert, A., Landriau, M., Guillou, L. L., Manera, M., Meisner, A., Miquel, R., Moustakas, J., Nadathur, S., Palanque-Delabrouille, N., Percival, W. J., Prada, F., Perez-Rafols, I., Rossi, G., Sanchez, E., Schlegel, D., Schubnell, M., Seo, H., Silber, J., Sprayberry, D., Tarle, G., Weaver, B. A., Zarrouk, P., Zhou, R., Zou, H.

30 Apr 2026, In: Journal of Cosmology and Astroparticle Physics. 2026, 04, 27p., 080

Research output: Article

Combined tracer analysis for DESI 2024 BAO

Valcin, D., Rashkovetskyi, M., Seo, H., Beutler, F., McDonald, P., de Mattia, A., Rosado-Marín, A. J., Ross, A. J., Padmanabhan, N., Aguilar, J., Ahlen, S., Andrade, U., Bianchi, D., Brooks, D., Chaussidon, E., Chen, S., Chen, X., Claybaugh, T., Cuceu, A., Dawson, K. S., Macorra, A. d. l., Dey, B., Ding, Z., Doel, P., Ferraro, S., Font-Ribera, A., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. G. A., Gutierrez, G., Hahn, C., Honscheid, K., Howlett, C., Ishak, M., Kehoe, R., Kirkby, D., Kisner, T., Kremin, A., Lahav, O., Lambert, A., Landriau, M., Levi, M. E., Manera, M., Meisner, A., Mena-Fernández, J., Miquel, R., Nadathur, S., Percival, W. J., Ruggeri, R., Samushia, L.

22 Apr 2026, In: Journal of Cosmology and Astroparticle Physics. 2026, 04, 37p., 058

Research output: Article

DESI DR1 Ly$α$ 1D power spectrum: Validation of estimators

Karaçaylı, N. G., Ravoux, C., Martini, P., Goff, J. M. L., Armengaud, E., Abdul-Karim, M., Aguilar, J., Ahlen, S., Anand, A., BenZvi, S., Bianchi, D., Brooks, D., Claybaugh, T., Cuceu, A., Macorra, A. d. l., Dey, B., 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., Ishak, M., Jimenez, J., Joyce, R., Kirkby, D., Kisner, T., Kremin, A., Lahav, O., Landriau, M., Guillou, L. L., Manera, M., Meisner, A., Miquel, R., Nadathur, S., Niz, G., Palanque-Delabrouille, N., Percival, W. J., Poppett, C., Prada, F., Pérez-Ràfols, I., Rossi, G., Sanchez, E., Schlegel, D., Schubnell, M., Seo, H., Silber, J.

16 Apr 2026, In: Journal of Cosmology and Astroparticle Physics. 2026, 04, 32p., 048

Research output: Article

Signatures of a Tidally Induced Spiral Arm at the Anticenter of the Milky Way and a Kinematically Extended Anticenter Stream Using DESI DR2

Lambert, M., Rockosi, C. M., Koposov, S. E., Li, T. S., Valluri, M., Silva, L. B. e., Li, S., Amarante, J. A. S., Byström, A., Medina, G. E., Sandford, N. R., Najita, J., Kizhuprakkat, N., Aguilar, J. N., Ahlen, S., Bianchi, D., Brooks, D., Claybaugh, T., Dawson, K., Macorra, A. d. l., Doel, P., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. G. A., Gutierrez, G., Joyce, D., Kremin, A., Lamman, C., Landriau, M., Guillou, L. L., Manera, M., Meisner, A., Miquel, R., Moustakas, J., Myers, A., Nadathur, S., Percival, W., Prada, F., Perez-Rafols, I., Rossi, G., Sanchez, E., Schlegel, D., Schubnell, M., Silber, J. H., Sprayberry, D., Tarle, G., Weaver, B. A., Zhou, R., Zou, H.

15 Apr 2026, In: The Astronomical Journal. 171, 5, 19p., 292

Research output: Article

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Dr Seshadri Nadathur

Summary

Research interests

Research outputs

2026