Euclid: Forecasts on $Λ$CDM consistency tests with growth rate data

The large-scale structure (LSS) of the Universe is an important probe for deviations from the canonical cosmological constant $Λ$ and cold dark matter ($Λ$CDM) model. A statistically significant detection of any deviations would signify the presence of new physics or the breakdown of any number of the underlying assumptions of the standard cosmological model or possible systematic errors in the data. In this paper, we quantify the ability of the LSS data products of the spectroscopic survey of the Euclid mission, together with other contemporary surveys, to improve the constraints on deviations from $Λ$CDM in the redshift range $0<z<1.75$. We consider both currently available growth rate data and simulated data with specifications from Euclid and external surveys, based on $Λ$CDM and a modified gravity (MoG) model with an evolving Newton's constant (denoted $μ$CDM), and carry out a binning method and a machine learning reconstruction, based on genetic algorithms (GAs), of several LSS null tests. Using the forecast Euclid growth data from the spectroscopic survey in the range $0.95<z<1.75$, we find that in combination with external data products (covering the range $0<z<0.95$), Euclid will be able to improve on current constraints of null tests of the LSS on average by a factor of eight when using a binning method and a factor of six when using the GAs. Our work highlights the need for synergies between Euclid and other surveys, but also the usefulness of statistical analyses, such as GAs, in order to disentangle any degeneracies in the cosmological parameters. Both are necessary to provide tight constraints over an extended redshift range and to probe for deviations from the $Λ$CDM model.

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ArXiv.org
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2025-07-30
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Credit Risk and Financial Regulations
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article

Euclid: Forecasts on $Λ$CDM consistency tests with growth rate data

M Viel, D Sapone, S Pires, G. Seidel et al.
ArXiv.org
Credit Risk and Financial Regulations
article

Euclid: Forecasts on $Λ$CDM consistency tests with growth rate data

M Viel, D Sapone, S Pires, G. Seidel, R. P. Saglia, P. Tallada-Crespí, A Balestra, G. Riccio, L. Conversi, M. Brescia, G de Lucia, B. Joachimi, S Ferriol, C. Giocoli, G Zamorani, F. Courbin, S Dusini, Pietro Battaglia, Santiago Casas, G. Sirri, S. Bardelli, F Faustini, Indira Ocampo, J Steinwagner, G Castignani, B Sartoris, L. Moscardini, L. Gabarra, S. Farrens, C. J. A. P. Martins, H Degaudenzi, S. V. H. Haugan, R. Massey, S. Paltani, R. Toledo-Moreo, Alberto Carvalho, M. Moresco, K Pedersen, F Grupp, M. Poncet, S Toft, N Tessore, M. Martinelli, M Ballardini, E. Romelli, V Capobianco, S Andreon, A. Biviano, E Medinaceli, I. Tutusaus, N. Martinet, J. Väliviita, C Sirignano, J. Carretero, S. Escoffier, C. Padilla Aranda, E. Maiorano, B. Gillis, F. Dubath, A. Hornstrup, V.F Cardone, K. Jahnkę, V. Pettorino, A. Secroun, M. Farina, M Jhabvala, S. Galeotta, F. Pasian, J. Weller, H Kurki-Suonio, S. Ligori, C Colodro-Conde, F. Raison, A Amara, E. Franceschi, Marco Baldi, E. Merlin, G Cañas-Herrera, Alain Blanchard, K. Markovič, Savvas Nesseris, S. Camera, K. C. Chambers, F. Finelli⋆, V. Lindholm, Jason Rhodes, R. Rébolo, E. Sefusatti, R Farinelli, A Grazian, E. Keihänen, E Branchini, Koshy George, S. Cavuoti, A da Silva, N. Auricchio, M. Frailis, V Scottez, A. Spurio Mancini, P. Bergamini, George Alestas, J. M. Diego, O. Mansutti, P. B. Lilje, S. Serrano, A Veropalumbo, A Renzi, A Pezzotta, C. Burigana, O Marggraf, A.M.C Le Brun, I Lloro, M. G. Castellano, A. Cimatti, S. Kermiche, H. M. Courtois, Yun Wang, L. Stančo, José P. Mimoso, M. D. Seiffert, M Kunz, F Torradeflot, Y. Mellier, C Neissner, J García-Bellido, I. Tereno, G Congedo, G. Meylan, P Fosalba, L. Valenziano, Z Sakr, G Polenta, W. A. Holmes, F. Hormuth, S Mei, B. Kubik, G Mainetti, M. D. Seiffert, Y. Ascasíbar, J Gracia-Carpio, N. Fourmanoit, A. Mora, C. Baccigalupi, C. Rosset, E Zucca, Francis Bernardeau, C.A.J Duncan, S de la Torre
article en

Abstract

The large-scale structure (LSS) of the Universe is an important probe for deviations from the canonical cosmological constant $Λ$ and cold dark matter ($Λ$CDM) model. A statistically significant detection of any deviations would signify the presence of new physics or the breakdown of any number of the underlying assumptions of the standard cosmological model or possible systematic errors in the data. In this paper, we quantify the ability of the LSS data products of the spectroscopic survey of the Euclid mission, together with other contemporary surveys, to improve the constraints on deviations from $Λ$CDM in the redshift range $0<z<1.75$. We consider both currently available growth rate data and simulated data with specifications from Euclid and external surveys, based on $Λ$CDM and a modified gravity (MoG) model with an evolving Newton's constant (denoted $μ$CDM), and carry out a binning method and a machine learning reconstruction, based on genetic algorithms (GAs), of several LSS null tests. Using the forecast Euclid growth data from the spectroscopic survey in the range $0.95<z<1.75$, we find that in combination with external data products (covering the range $0<z<0.95$), Euclid will be able to improve on current constraints of null tests of the LSS on average by a factor of eight when using a binning method and a factor of six when using the GAs. Our work highlights the need for synergies between Euclid and other surveys, but also the usefulness of statistical analyses, such as GAs, in order to disentangle any degeneracies in the cosmological parameters. Both are necessary to provide tight constraints over an extended redshift range and to probe for deviations from the $Λ$CDM model.

ArXiv.org
Centre National de la Recherche Scientifique (FR), Université Paris Cité (FR), Université de Lille (FR), Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR), Centre National d'Études Spatiales (FR), Institut d'Astrophysique de Paris (FR), European Space Agency (FR), Laboratoire AstroParticule et Cosmologie (FR), Astrophysique, Instrumentation et Modélisation (FR), Centre de physique des particules de Marseille (FR), Laboratoire d’Astrophysique de Marseille (FR), Château Gombert (FR), CEA Paris-Saclay (FR), Centre de Calcul de l’Institut National de Physique Nucléaire et de Physique des Particules (FR), Institute of Nuclear Physics of Lyon (FR), Institut de Physique Théorique (FR), Institut de Recherche en Astrophysique et Planétologie (FR), Institut de Physique des 2 Infinis de Lyon (FR)
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