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Euclid: Impact of non-linear and baryonic feedback prescriptions on cosmological parameter estimation from weak lensing cosmic shear

Martinelli, M. and Tutusaus, I. and Archidiacono, M. and Camera, S. and Cardone, V. F. and Clesse, S. and Casas, S. and Casarini, L. and Mota, D. F. and Hoekstra, H. and Carbone, C. and Ilić, S. and Kitching, T. D. and Pettorino, V. and Pourtsidou, A. and Sakr, Z. and Sapone, D. and Auricchio, N. and Balestra, A. and Boucaud, A. and Branchini, E. and Brescia, M. and Capobianco, V. and Carretero, J. and Castellano, M. and Cavuoti, S. and Cimatti, A. and Cledassou, R. and Congedo, G. and Conselice, C. and Conversi, L. and Corcione, L. and Costille, A. and Douspis, M. and Dubath, F. and Dusini, S. and Fabbian, G. and Fosalba, P. and Frailis, M. and Franceschi, E. and Gillis, B. and Giocoli, C. and Grupp, F. and Guzzo, L. and Holmes, W. and Hormuth, F. and Jahnke, K. and Kermiche, S. and Kiessling, A. and Kilbinger, M. and Kunz, M. and Kurki-Suonio, H. and Ligori, S. and Lilje, P. B. and Lloro, I. and Maiorano, E. and Marggraf, O. and Markovic, K. and Massey, R. and Meneghetti, M. and Meylan, G. and Morin, B. and Moscardini, L. and Niemi, S. and Padilla, C. and Paltani, S. and Pasian, F. and Pedersen, K. and Pires, S. and Polenta, G. and Poncet, M. and Popa, L. and Raison, F. and Rhodes, J. and Roncarelli, M. and Rossetti, E. and Saglia, R. and Schneider, P. and Secroun, A. and Serrano, S. and Sirignano, C. and Sirri, G. and Starck, J.-L. and Sureau, F. and Taylor, A. N. and Tereno, I. and Toledo-Moreo, R. and Valentijn, E. A. and Valenziano, L. and Vassallo, T. and Wang, Y. and Welikala, N. and Zacchei, A. and Zoubian, J. (2021) Euclid: Impact of non-linear and baryonic feedback prescriptions on cosmological parameter estimation from weak lensing cosmic shear. Astronomy and Astrophysics, 649 . Art. No. A100. ISSN 0004-6361. doi:10.1051/0004-6361/202039835.

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Upcoming surveys will map the growth of large-scale structure with unprecented precision, improving our understanding of the dark sector of the Universe. Unfortunately, much of the cosmological information is encoded on small scales, where the clustering of dark matter and the effects of astrophysical feedback processes are not fully understood. This can bias the estimates of cosmological parameters, which we study here for a joint analysis of mock Euclid cosmic shear and Planck cosmic microwave background data. We use different implementations for the modelling of the signal on small scales and find that they result in significantly different predictions. Moreover, the different non-linear corrections lead to biased parameter estimates, especially when the analysis is extended into the highly non-linear regime, with the Hubble constant, H₀, and the clustering amplitude, σ₈, affected the most. Improvements in the modelling of non-linear scales will therefore be needed if we are to resolve the current tension with more and better data. For a given prescription for the non-linear power spectrum, using different corrections for baryon physics does not significantly impact the precision of Euclid, but neglecting these correction does lead to large biases in the cosmological parameters. In order to extract precise and unbiased constraints on cosmological parameters from Euclid cosmic shear data, it is therefore essential to improve the accuracy of the recipes that account for non-linear structure formation, as well as the modelling of the impact of astrophysical processes that redistribute the baryons.

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Rhodes, J.0000-0002-4485-8549
Alternate Title:Euclid: impact of nonlinear prescriptions on cosmological parameter estimation from weak lensing cosmic shear
Additional Information:© ESO 2021. Received 3 November 2020 / Accepted 12 April 2021. D. F. M. thanks the Research Council of Norway for their support, and the resources provided by UNINETT Sigma2 – the National Infrastructure for High Performance Computing and Data Storage in Norway. M. M. has received the support of a fellowship from “la Caixa” Foundation (ID 100010434), with fellowship code LCF/BQ/PI19/11690015, and the support of the Spanish Agencia Estatal de Investigacion through the grant “IFT Centro de Excelencia Severo Ochoa SEV-2016-0597”. This paper is based upon work from the COST action CA15117 (CANTATA), supported by COST (European Cooperation in Science and Technology). M. A. acknowledges the computing support of INFN-CNAF. Stefano Camera acknowledges support from the Italian Ministry of Education, University and Research (MIUR) through Rita Levi Montalcini project ‘PROMETHEUS – Probing and Relating Observables with Multi-wavelength Experiments To Help Enlightening the Universe’s Structure’, and the ‘Departments of Excellence 2018–2022’ Grant awarded by MIUR (L. 232/2016). The work of SC is supported by the Belgian Fund for Research FNRS-F.R.S. I. T. acknowledges support from the Spanish Ministry of Science, Innovation and Universities through grant ESP2017-89838-C3-1-R. I. T. and T. K. acknowledge funding from the H2020 programme of the European Commission through grant 776247. AP is a UK Research and Innovation Future Leaders Fellow, grant MR/S016066/1. The Euclid Consortium acknowledges the European Space Agency and a number of agencies and institutes that have supported the development of Euclid, in particular the Academy of Finland, the Agenzia Spaziale Italiana, the Belgian Science Policy, the Canadian Euclid Consortium, the Centre National d’Etudes Spatiales, the Deutsches Zentrum für Luft- und Raumfahrt, the Danish Space Research Institute, the Fundação para a Ciência e a Tecnologia, the Ministerio de Economia y Competitividad, the National Aeronautics and Space Administration, the Netherlandse Onderzoekschool Voor Astronomie, the Norwegian Space Agency, the Romanian Space Agency, the State Secretariat for Education, Research and Innovation (SERI) at the Swiss Space Office (SSO), and the United Kingdom Space Agency. A complete and detailed list is available on the Euclid web site (
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Research Council of NorwayUNSPECIFIED
La Caixa FoundationLCF/BQ/PI19/11690015
Centro de Excelencia Severo OchoaSEV-2016-0597
European Cooperation in Science and Technology (COST)CA15117
Ministero dell'Istruzione, dell'Université e della Ricerca (MIUR)232/2016
Fonds de la Recherche Scientifique (FNRS)UNSPECIFIED
Ministerio de Ciencia, Innovación y Universidades (MICIU)ESP2017-89838-C3-1-R
European Research Council (ERC)776247
UK Research and InnovationMR/S016066/1
European Space Agency (ESA)UNSPECIFIED
Subject Keywords:gravitational lensing: weak / large-scale structure of Universe / cosmological parameters
Record Number:CaltechAUTHORS:20210520-113959909
Persistent URL:
Official Citation:Euclid: Impact of non-linear and baryonic feedback prescriptions on cosmological parameter estimation from weak lensing cosmic shear M. Martinelli, I. Tutusaus, M. Archidiacono, S. Camera, V. F. Cardone, S. Clesse, S. Casas, L. Casarini, D. F. Mota, H. Hoekstra, C. Carbone, S. Ilić, T. D. Kitching, V. Pettorino, A. Pourtsidou, Z. Sakr, D. Sapone, N. Auricchio, A. Balestra, A. Boucaud, E. Branchini, M. Brescia, V. Capobianco, J. Carretero, M. Castellano, S. Cavuoti, A. Cimatti, R. Cledassou, G. Congedo, C. Conselice, L. Conversi, L. Corcione, A. Costille, M. Douspis, F. Dubath, S. Dusini, G. Fabbian, P. Fosalba, M. Frailis, E. Franceschi, B. Gillis, C. Giocoli, F. Grupp, L. Guzzo, W. Holmes, F. Hormuth, K. Jahnke, S. Kermiche, A. Kiessling, M. Kilbinger, M. Kunz, H. Kurki-Suonio, S. Ligori, P. B. Lilje, I. Lloro, E. Maiorano, O. Marggraf, K. Markovic, R. Massey, M. Meneghetti, G. Meylan, B. Morin, L. Moscardini, S. Niemi, C. Padilla, S. Paltani, F. Pasian, K. Pedersen, S. Pires, G. Polenta, M. Poncet, L. Popa, F. Raison, J. Rhodes, M. Roncarelli, E. Rossetti, R. Saglia, P. Schneider, A. Secroun, S. Serrano, C. Sirignano, G. Sirri, J.-L. Starck, F. Sureau, A. N. Taylor, I. Tereno, R. Toledo-Moreo, E. A. Valentijn, L. Valenziano, T. Vassallo, Y. Wang, N. Welikala, A. Zacchei and J. Zoubian A&A, 649 (2021) A100 DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:109199
Deposited By: George Porter
Deposited On:21 May 2021 14:10
Last Modified:16 Nov 2021 19:34

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