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

2025

Euclid preparation: LXIII. Simulations and non-linearities beyond Lambda cold dark matter. 2. Results from non-standard simulations

Adame, A. G., Adamek, J., Aghanim, N., Altamura, E., Andreon, S., Avila, S., Baccigalupi, C., Baldi, M., Breton, M. -., Brun, A. M. C. L., Carbone, C., Carella, E., Casas, S., Collaboration, E., Corasaniti, P. -., Despali, G., Fiorini, B., García-Bellido, J., Gayoux, T., Gaztanaga, E., Giocoli, C., Gonzalez-Perez, V., Hamaus, N., Hassani, F., Hernández-Aguayo, C., Kiessling, A., Koyama, K., Kunz, M., Li, B., Marinucci, M., Markovic, K., Moretti, C., Mota, D. F., Nadathur, S., Pardede, K., Percival, W. J., Piga, L., Pisani, A., Pizzuti, L., Pourtsidou, A., Ragagnin, A., Rasera, Y., Rácz, G., Sakr, Z., Szapudi, I., Tallada-Crespí, P., Vernizzi, F., Verza, G., Winther, H. -., Yepes, G.

27 Mar 2025, In: Astronomy and Astrophysics. 695, 22p., A232

Euclid preparation: LXII. Simulations and non-linearities beyond Lambda cold dark matter. 1. Numerical methods and validation

Adamek, J., Altamura, E., Amara, A., Andreon, S., Auricchio, N., Baccigalupi, C., Baldi, M., Bardelli, S., Battaglia, P., Bonino, D., Branchini, E., Brando, G., Brescia, M., Breton, M. -., Brinchmann, J., Brun, A. M. C. L., Caillat, A., Camera, S., Capobianco, V., Carbone, C., Cardone, V. F., Carretero, J., Casalino, A., Casas, S., Castander, F. J., Castellano, M., Castignani, G., Cavuoti, S., Cimatti, A., Collaboration, E., Colodro-Conde, C., Congedo, G., Fiorini, B., Gaztanaga, E., Giocoli, C., Hassani, F., Hernández-Aguayo, C., Joudaki, S., Koyama, K., Li, B., Markovic, K., Mota, D. F., Nadathur, S., Percival, W. J., Potter, D., Pourtsidou, A., Rácz, G., Sakr, Z., Vernizzi, F., Winther, H. -.

26 Mar 2025, In: Astronomy and Astrophysics. 695, 21p., A230

DESI 2024 VI: Cosmological Constraints from the Measurements of Baryon Acoustic Oscillations

Adame, A. G., Aguilar, J., Ahlen, S., Alam, S., Alexander, D. M., Alvarez, M., Alves, O., Anand, A., Andrade, U., Armengaud, E., Avila, S., Aviles, A., Awan, H., Bahr-Kalus, B., Baltay, C., Bault, A., Behera, J., BenZvi, S., Bera, A., Beutler, F., Bianchi, D., Blake, C., Blum, R., Brieden, S., Brodzeller, A., Brooks, D., Buckley-Geer, E., Burtin, E., Calderon, R., Canning, R., Cereskaite, R., Cervantes-Cota, J. L., Chabanier, S., Chaussidon, E., Chaves-Montero, J., Chen, S., Chen, X., Claybaugh, T., Cole, S., Collaboration, D., Findlay, N. T. B., Gaztanaga, E., Gonzalez-Perez, V., Gsponer, R., Mueller, E., Nadathur, S., Percival, W. J., Pieri, M., Rosell, A. C., Ruggeri, R., Samushia, L., Wang, M. S.

12 Feb 2025, In: Journal of Cosmology and Astroparticle Physics. 02, 70p., 021

Euclid preparation. Angular power spectra from discrete observations

Amara, A., Andreon, S., Auricchio, N., Baccigalupi, C., Baldi, M., Bardelli, S., Bernardeau, F., Bonino, D., Branchini, E., Brescia, M., Brinchmann, J., Caillat, A., Camera, S., Capobianco, V., Carbone, C., Cardone, V. F., Carretero, J., Casas, S., Castellano, M., Castignani, G., Cavuoti, S., Cañas-Herrera, G., Cimatti, A., Collaboration, E., Colodro-Conde, C., Congedo, G., Conselice, C. J., Conversi, L., Copin, Y., Courbin, F., Courtois, H. M., Cropper, M., Degaudenzi, H., Dinis, J., Dubath, F., Dupac, X., Gaztanaga, E., Hall, A., Jeffrey, N., Joachimi, B., Joudaki, S., Loureiro, A., Lucia, G. D., McEwen, J. D., Nadathur, S., Naidoo, K., Percival, W. J., Silva, A. D., Tessore, N., Tutusaus, I.

10 Feb 2025, In: Astronomy and Astrophysics. 694, 27p., A141

DESI 2024 IV: Baryon Acoustic Oscillations from the Lyman alpha forest

Adame, A. G., Aguilar, J., Ahlen, S., Alam, S., Alexander, D. M., Alvarez, M., Alves, O., Anand, A., Andrade, U., Armengaud, E., Avila, S., Aviles, A., Awan, H., Baltay, C., Bault, A., Bautista, J., Behera, J., BenZvi, S., Beutler, F., Bianchi, D., Blake, C., Blum, R., Brieden, S., Brodzeller, A., Brooks, D., Buckley-Geer, E., Burtin, E., Calderon, R., Canning, R., Cereskaite, R., Cervantes-Cota, J. L., Chabanier, S., Chaussidon, E., Findlay, N., Gaztañaga, E., Gil-Marín, H., Gonzalez-Perez, V., Gsponer, R., Howlett, C., Manera, M., Mueller, E., Nadathur, S., Percival, W. J., Pieri, M. M., Rosell, A. C., Ross, A. J., Ruggeri, R., Samushia, L., Wang, M. S.

30 Jan 2025, In: Journal of Cosmology and Astroparticle Physics. 2025, 1, p. 1-64, 64p., 124

Optimal reconstruction of baryon acoustic oscillations for DESI 2024

Aguilar, J., Ahlen, S., Alves, O., Andrade, U., Brooks, D., Buckley-Geer, E., Burtin, E., Chen, S., Chen, X., Claybaugh, T., Cole, S., Dawson, K., Dey, A., Ding, Z., Doel, P., Fanning, K., Ferraro, S., Forero-Romero, J. E., Garcia-Quintero, C., Gaztañaga, E., Gil-Marín, H., Gontcho, S. G. A., Guillou, L. L., Gutierrez, G., Hahn, C., Hanif, M. M. S., Honscheid, K., Howlett, C., Ishak, M., Kehoe, R., Kremin, A., Landriau, M., Levi, M. E., Macorra, A. d. l., Manera, M., Martini, P., Mattia, A. d., Medina-Varela, L., Meisner, A., Mena-Fernández, J., Miquel, R., Moustakas, J., Mueller, E., Nadathur, S., Padmanabhan, N., Paillas, E., Percival, W. J., Ross, A. J., Ruggeri, R., Seo, H.

30 Jan 2025, In: Journal of Cosmology and Astroparticle Physics. 2025, 1, p. 1-51, 51p., 142

HOD-Dependent Systematics in Emission Line Galaxies for the DESI 2024 BAO analysis

Aguilar, J., Ahlen, S., Alves, O., Andrade, U., BenZvi, S., Bera, A., Brooks, D., Burtin, E., Chen, S., Chen, X., Claybaugh, T., Cole, S., Dey, A., Dey, B., Ding, Z., Doel, P., Fanning, K., Forero-Romero, J. E., Garcia-Quintero, C., Gaztañaga, E., Gil-Marín, H., Gontcho, S. G. A., Guillou, L. L., Gutierrez, G., Guy, J., Hadzhiyska, B., Hahn, C., Honscheid, K., Howlett, C., Ishak, M., Kremin, A., Landriau, M., Levi, M. E., Macorra, A. d. l., Manera, M., Martini, P., Mattia, A. d., McDonald, P., Medina-Varela, L., Meisner, A., Mena-Fernández, J., Miquel, R., Moustakas, J., Mueller, E., Muñoz-Gutiérrez, A., Myers, A. D., Nadathur, S., Nie, J., Niz, G., Padmanabhan, N., Paillas, E., Palanque-Delabrouille, N., Percival, W. J., Poppett, C., Pérez-Fernández, A., Rashkovetskyi, M., Rocher, A., Rosado-Marin, A., Ross, A. J., Rossi, G., Ruggeri, R., Sanchez, E., Schlegel, D., Schubnell, M., Seo, H., Sprayberry, D., Tarlé, G., Vargas-Magaña, M., Weaver, B. A., Xie, Y., Yuan, S., Zhang, H., Zhou, R., Zou, H.

30 Jan 2025, In: Journal of Cosmology and Astroparticle Physics. 2025, 1, p. 1-59, 59p., 132

An analysis of parameter compression and full-modeling techniques with Velocileptors for DESI 2024 and beyond

Aguilar, J., Ahlen, S., Aviles, A., Brieden, S., Brooks, D., Chen, S., Claybaugh, T., Cole, S., Dey, A., Doel, P., Ferraro, S., Findlay, N., Forero-Romero, J. E., Gaztañaga, E., Gil-Marín, H., Gontcho, S. G. A., Hahn, C., Honscheid, K., Howlett, C., Ishak, M., Juneau, S., Kremin, A., Landriau, M., Levi, M. E., Macorra, A. d. l., Manera, M., Maus, M., Miquel, R., Mueller, E., Myers, A. D., Nadathur, S., Nie, J., Noriega, H. E., Palanque-Delabrouille, N., Percival, W. J., Poppett, C., Ramirez-Solano, S., Rezaie, M., Rocher, A., Rossi, G., Sanchez, E., Schlegel, D., Schubnell, M., Seo, H., Sprayberry, D., Tarlé, G., Vargas-Magaña, M., Weaver, B. A., White, M., Yuan, S., Zarrouk, P., Zhang, H., Zhou, R., Zou, H.

30 Jan 2025, In: Journal of Cosmology and Astroparticle Physics. 2025, 1, p. 1-59, 59p., 138

Comparing compressed and full-modeling analyses with FOLPS: implications for DESI 2024 and beyond

Aguilar, J., Ahlen, S., Alves, O., Aviles, A., Brieden, S., Brooks, D., Cervantes-Cota, J. L., Chen, S., Claybaugh, T., Cole, S., Dawson, K., Doel, P., Findlay, N., Forero-Romero, J. E., Fromenteau, S., Gaztañaga, E., Gil-Marín, H., Gontcho, S. G. A., Honscheid, K., Hou, J., Howlett, C., Ishak, M., Juneau, S., Landriau, M., Macorra, A. d. l., Manera, M., Mattia, A. d., Maus, M., Miquel, R., Morales-Navarrete, G., Mueller, E., Muñoz-Gutiérrez, A., Myers, A. D., Nadathur, S., Niz, G., Noriega, H. E., Palanque-Delabrouille, N., Percival, W. J., Poppett, C., Ramirez-Solano, S., Rezaie, M., Rocher, A., Rossi, G., Sanchez, E., Schlegel, D., Schubnell, M., Sprayberry, D., Tarlé, G., Vargas-Magaña, M., Verde, L., Yuan, S., Zarrouk, P., Zou, H.

30 Jan 2025, In: Journal of Cosmology and Astroparticle Physics. 2025, 1, p. 1-66, 66p., 136

Validating the galaxy and quasar catalog-level blinding scheme for the DESI 2024 analysis

Aguilar, J., Ahlen, S., Alves, O., Andrade, U., Awan, H., Brieden, S., Brooks, D., Buckley-Geer, E., Chaussidon, E., Claybaugh, T., Cole, S., Dey, A., Doel, P., Fanning, K., Forero-Romero, J. E., Gaztañaga, E., Gil-Marín, H., Gontcho, S. G. A., Guillou, L. L., Guy, J., Hahn, C., Hanif, M. M. S., Honscheid, K., Howlett, C., Huterer, D., Juneau, S., Kremin, A., Landriau, M., Levi, M. E., Macorra, A. d. l., Manera, M., Martini, P., Mattia, A. d., Meisner, A., Mena-Fernández, J., Miquel, R., Moustakas, J., Mueller, E., Muñoz-Gutiérrez, A., Myers, A. D., Nadathur, S., Nie, J., Niz, G., Palanque-Delabrouille, N., Pan, J., Percival, W. J., Pinon, M., Poppett, C., Prada, F., Rashkovetskyi, M., Rezaie, M., Ross, A. J., Rossi, G., Sanchez, E., Schlegel, D., Schubnell, M., Seo, H., Sprayberry, D., Tarlé, G., Vargas-Magaña, M., Verde, L., Weaver, B. A.

30 Jan 2025, In: Journal of Cosmology and Astroparticle Physics. 2025, 1, p. 1-46, 45p., 128

View all my research outputs

Dr Seshadri Nadathur

Summary

Research interests

Research outputs

2025