Year: 2026
Type: preprint
Abstract: Higher-order correlation functions of the large-scale galaxy distribution offer access to information beyond that contained in standard 2-point statistics such as the power spectrum. In this work we assess this potential for the $\textit{Euclid}$ mission using synthetic catalogues of H$α$ galaxies based on the 54 $\, h^{-3} \, {\rm Gpc}^3$ Flagship I simulation, designed to reproduce the $\textit{Euclid}$ spectroscopic sample. We comprehensively validate the one-loop galaxy power spectrum and tree-level bispectrum predictions from perturbation theory in both real and redshift space. Assuming scale cuts consistent with our previous power spectrum study on the same catalogues, this modelling yields unbiased cosmological constraints for the bispectrum up to $k_{\rm max} = 0.15\,\, h \, {\rm Mpc}^{-1}$ in real space and $0.08 \, (0.1)\,\, h \, {\rm Mpc}^{-1}$ at the lowest (highest) redshift, corresponding to $z=0.9$ ($z=1.8$), for the monopole and quadrupole in redshift space using statistical uncertainties corresponding to the full simulation volume. With these scale cuts, adding bispectrum information to the power spectrum improves constraints on the amplitude of scalar perturbations and the matter density by up to 30 %, increasing the overall figure of merit for key cosmological parameters by a factor of about 2.5. Similar conclusions hold when statistical uncertainties are rescaled to a $\textit{Euclid}$-like volume, highlighting the importance of the bispectrum for fully exploiting the forthcoming $\textit{Euclid}$ data. Our analysis also provides the first detailed characterisation of the nonlinear bias model of H$α$ emitters, showing that bias relations calibrated on low-resolution \textit{N}-body simulations do not adequately describe the clustering of H$α$ galaxies at low redshift, whereas excursion-set and co-evolution relations for tidal biases remain accurate.
Source: arXiv (Cornell University)
Authors: Euclid Collaboration, Pardede, K., Eggemeier, A., Alkhanishvili, D., Sefusatti, E., Dizgah, A. Moradinezhad, Christoph, L., Chudaykin, A., Kärcher, M., Linde, D., Marinucci, M., Porciani, C., Veropalumbo, A., Crocce, M., Cagliari, M. S., Quevedo, B. Camacho, Castiblanco, L., Castorina, E., D'Amico, G., Desjacques, V., Farina, A., Gambardella, G., Guidi, M., Janssen, F., Lesgourgues, J., Moretti, C., Pezzotta, A., Pugno, A., Salvalaggio, J., Altieri, B., Andreon, S., Auricchio, N., Baldi, M., Bardelli, S., Battaglia, P., Biviano, A., Brescia, M., Camera, S., Cañas-Herrera, G., Capobianco, V., Carbone, C., Cardone, V. F., Carretero, J., Casas, S., Castellano, M., Castignani, G., Cavuoti, S., Chambers, K. C., Cimatti, A., Colodro-Conde, C., Congedo, G., Conselice, C. J., Conversi, L., Copin, Y., Courbin, F., Courtois, H. M., Da Silva, A., Degaudenzi, H., de la Torre, S., De Lucia, G., Dole, H., Dubath, F., Dupac, X., Escoffier, S., Farina, M., Farinelli, R., Faustini, F., Ferriol, S., Finelli, F., Fosalba, P., Fotopoulou, S., Fourmanoit, N., Frailis, M., Franceschi, E., Fumana, M., Galeotta, S., George, K., Gillis, B., Giocoli, C., Gracia-Carpio, J., Grazian, A., Grupp, F., Haugan, S. V. H., Holmes, W., Hormuth, F., Hornstrup, A., Jahnke, K., Jhabvala, M., Joachimi, B., Kermiche, S., Kiessling, A., Kubik, B., Kunz, M., Kurki-Suonio, H., Brun, A. M. C. Le, Ligori, S., Lilje, P. B., Lindholm, V., Lloro, I., Mainetti, G., Maino, D., Maiorano, E., Mansutti, O., Marcin, S., Marggraf, O., Markovic, K., Martinelli, M., Martinet, N., Marulli, F., Massey, R. J., Medinaceli, E., Mei, S., Melchior, M., Mellier, Y., Meneghetti, M., Merlin, E., Meylan, G., Mora, A., Moresco, M., Moscardini, L., Neissner, C., Niemi, S. -M., Nightingale, J. W., Padilla, C., Paltani, S., Pasian, F., Pedersen, K., Percival, W. J., Pettorino, V., Pires, S., Polenta, G., Poncet, M., Popa, L. A., Raison, F., Renzi, A., Rhodes, J., Riccio, G., Romelli, E., Roncarelli, M., Saglia, R., Sakr, Z., Sánchez, A. G., Sapone, D., Sartoris, B., Schneider, P., Secroun, A., Seidel, G., Serrano, S., Sihvola, E., Simon, P., Sirignano, C., Sirri, G., Mancini, A. Spurio, Stanco, L., Steinwagner, J., Tallada-Crespí, P., Tereno, I., Tessore, N., Toft, S., Toledo-Moreo, R., Torradeflot, F., Tutusaus, I., Valiviita, J., Vassallo, T., Kleijn, G. Verdoes, Wang, Y., Weller, J., Zamorani, G., Zerbi, F. M., Zucca, E., Allevato, V., Ballardini, M., Boucaud, A., Bozzo, E., Burigana, C., Cabanac, R., Calabrese, M., Cappi, A., Castro, T., Vigo, J. A. Escartin, Gabarra, L., García-Bellido, J., Gautard, V., Hemmati, S., Macias-Perez, J., Maoli, R., Martín-Fleitas, J., Mauri, N., Metcalf, R. B., Monaco, P., Pöntinen, M., Risso, I., Scottez, V., Sereno, M., Tenti, M., Tucci, M., Viel, M., Wiesmann, M., Akrami, Y., Andika, I. T., Angora, G., Anselmi, S., Archidiacono, M., Atrio-Barandela, F., Aubourg, E., Bazzanini, L., Bel, J., Bertacca, D., Bethermin, M., Beutler, F., Blanchard, A., Blot, L., Bonici, M., Borgani, S., Brown, M. L., Bruton, S., Calabro, A., Caro, F., Carvalho, C. S., Cogato, F., Conseil, S., Cooray, A. R., Davini, S., Desprez, G., Díaz-Sánchez, A., Di Domizio, S., Diego, J. M., Duret, V., Elkhashab, M. Y., Enia, A., Fang, Y., Finoguenov, A., Fontana, A., Fontanot, F., Franco, A., Ganga, K., Gasparetto, T., Gaztanaga, E., Giacomini, F., Gianotti, F., Gozaliasl, G., Gruppuso, A., Gutierrez, C. M., Hall, A., Hernández-Monteagudo, C., Hildebrandt, H., Hjorth, J., Kajava, J. J. E., Kang, Y., Kansal, V., Karagiannis, D., Kiiveri, K., Kim, J., Kirkpatrick, C. C., Kruk, S., Lattanzi, M., Legrand, L., Lembo, M., Lepori, F., Leroy, G., Lesci, G. F., Liaudat, T. I., Liu, S. J., Magliocchetti, M., Martins, C. J. A. P., Maurin, L., Miluzio, M., Morgante, G., Nadathur, S., Naidoo, K., Natoli, P., Navarro-Alsina, A., Nesseris, S., Pagano, L., Paoletti, D., Passalacqua, F., Paterson, K., Patrizii, L., Paviot, R., Pisani, A., Potter, D., Pratt, G. W., Quai, S., Radovich, M., Rojas, K., Roster, W., Sacquegna, S., Sahlén, M., Sanders, D. B., Sarpa, E., Schneider, A., Sciotti, D., Sellentin, E., Smith, L. C., Sorce, J. G., Tanidis, K., Tao, C., Tarsitano, F., Testera, G., Teyssier, R., Tosi, S., Troja, A., Vergani, D., Vernizzi, F., Verza, G., Vielzeuf, P., Vinciguerra, S., Walton, N. A., Wright, A. H.
Institutions: The Abdus Salam International Centre for Theoretical Physics (ICTP), Jet Propulsion Laboratory, Scuola Internazionale Superiore di Studi Avanzati, Institute for Fundamental Physics of the Universe, Istituto Nazionale di Fisica Nucleare, Gruppo Collegato di Parma, University of Bonn, Trieste Astronomical Observatory, Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, Centre National de la Recherche Scientifique, Laboratoire d'Annecy de Physique Théorique, Université Savoie Mont Blanc, University of Geneva, University of Milan, University of Padua, Istituto Nazionale di Fisica Nucleare, Sezione di Padova, Brera Astronomical Observatory, Istituto Nazionale di Fisica Nucleare, Sezione di Genova, University of Genoa, Institut d'Estudis Espacials de Catalunya, Bielefeld University, Newcastle University, Istituto Nazionale di Fisica Nucleare, Sezione di Milano, University of Parma, Technion – Israel Institute of Technology, Osservatorio di Astrofisica e Scienza dello Spazio, National Institute for Astrophysics, University of Bologna, California Institute of Technology, University of Trieste, European Space Astronomy Centre, Istituto Nazionale di Fisica Nucleare, Sezione di Bologna, Astronomical Observatory of Capodimonte, University of Naples Federico II, Istituto Nazionale di Fisica Nucleare, Sezione di Torino, Osservatorio Astrofisico di Torino, University of Turin, Leiden University, Royal Observatory, Leiden Observatory, University of Edinburgh, Astronomical Observatory of Rome, Istituto Nazionale di Fisica Nucleare, Sezione di Roma I, Port d'Informació Científica, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR), Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, University of Hawaiʻi at Mānoa, University of Hawaii System, Instituto de Astrofísica de Canarias, University of Manchester, European Space Agency, European Space Research Institute, Lyon 1 Université, Institut National de Physique Nucléaire et de Physique des Particules, Institut de Physique des 2 Infinis de Lyon, Institució Catalana de Recerca i Estudis Avançats, Institute of Space Sciences, Institut de Ciències del Cosmos, University of Lisbon, Institute of Astrophysics and Space Sciences, Aix-Marseille Université, Université Paris-Saclay, Institut d'Astrophysique Spatiale, Centre de physique des particules de Marseille, Institute for Space Astrophysics and Planetology, Agenzia Spaziale Italiana, University of Bristol, Ludwig-Maximilians-Universität München, Max Planck Institute for Extraterrestrial Physics, Osservatorio Astronomico di Padova, University of Oslo, Technical University of Denmark, Max Planck Institute for Astronomy, Goddard Space Flight Center, University College London, University of Helsinki, Helsinki Institute of Physics, Université Paris Sciences et Lettres, Observatoire de Paris, Sorbonne Université, Laboratoire d'Étude de l'Univers et des Phénomènes Extrêmes, SKA Observatory, Centre de Calcul de l’Institut National de Physique Nucléaire et de Physique des Particules, FHNW University of Applied Sciences and Arts Northwestern Switzerland, Durham University, Université Paris Cité, Centre Pierre Binétruy, University of California, Berkeley, Institut d'Astrophysique de Paris, École Polytechnique Fédérale de Lausanne, Institute for High Energy Physics, European Space Research and Technology Centre, University of Copenhagen, University of Waterloo, Perimeter Institute, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Astrophysique, Instrumentation et Modélisation, Centre National d'Études Spatiales, Institute of Space Science - INFLPR Subsidiary, Saint Joseph University, Heidelberg University, Institut de Recherche en Astrophysique et Planétologie, University of Chile, University of London, Royal Holloway University of London, Universidad Politécnica de Cartagena, University of Groningen, Infrared Processing and Analysis Center, University of Ferrara, Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara, Istituto di Radioastronomia di Bologna, Osservatorio Astronomico della Regione Autonoma Valle d'Aosta, Regione Autonoma Valle d'Aosta, Université Côte d'Azur, Lagrange Laboratory, Observatoire de la Côte d’Azur, Fondazione ICSC Centro Nazionale di Ricerca in High Performance Computing, Big Data e Quantum Computing, University of Oxford, Consejo Superior de Investigaciones Científicas, Instituto de Física Teórica, CEA Paris-Saclay - Etablissement de Saclay, Institut de Recherche sur les Lois Fondamentales de l'Univers, Institut polytechnique de Grenoble, Sapienza University of Rome, Université Catholique de Lille, JUNIA, Case Western Reserve University, Laboratoire Univers et Théories, Universidad de Salamanca, CEA Paris-Saclay, Université de Toulon, Observatoire astronomique de Strasbourg, Université de Strasbourg, Kavli Institute for the Physics and Mathematics of the Universe, University of California, Irvine, Instituto de Física de Cantabria, University of Salento, Istituto Nazionale di Fisica Nucleare, Sezione di Lecce, University of Portsmouth, Aalto University, Universidad de La Laguna, Ruhr University Bochum, University of Turku, ARC Centre of Excellence for Dark Matter Particle Physics, Swinburne University of Technology, University of the Western Cape, University of Cambridge, University of Zurich, Universidade do Porto, Centro de Astrofísica da Universidade do Porto, Collurania Teramo Observatory, Uppsala University, Université de Lille, Centre de Recherche en Informatique, Signal et Automatique de Lille, Centrale Lille Institut, ETH Zurich, Institute for Particle Physics and Astrophysics, Princeton University, Institut de Physique Théorique, Flatiron Institute
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7147321840
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