Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/32265
Title: | Euclid preparation: IX. EuclidEmulator2 - power spectrum emulation with massive neutrinos and self-consistent dark energy perturbations | Authors: | Euclid Collaboration Knabenhans, M. Stadel, J. Potter, D. Dakin, J. Hannestad, S. Tram, T. Marelli, S. Schneider, A. Teyssier, R. Fosalba, P. Pires, S. Polenta, G. Poncet, M. Raison, F. Renzi, A. Rhodes, J. RICCIO, GIUSEPPE Romelli, Erik Roncarelli, M. Saglia, R. ANDREON, Stefano Sánchez, A. G. Sapone, D. Schneider, P. Scottez, V. Secroun, A. Serrano, S. Sirignano, C. Sirri, G. Stanco, L. Sureau, F. AURICCHIO, NATALIA Tallada Crespí, P. Taylor, A. N. Tenti, M. Tereno, I. Toledo-Moreo, R. Torradeflot, F. VALENZIANO, LUCA Valiviita, J. Vassallo, T. VIEL, MATTEO Baccigalupi, C. Wang, Y. Welikala, N. Whittaker, L. ZACCHEI, Andrea ZUCCA, Elena Balaguera-Antolínez, A. Baldi, M. BARDELLI, Sandro BATTAGLIA, PAOLA MARIA Bender, R. BIVIANO, ANDREA Bodendorf, C. Bozzo, E. Branchini, Enzo BRESCIA, Massimo BURIGANA, CARLO Cabanac, R. Camera, S. Capobianco, Vito CAPPI, Alberto CARBONE, Carmelita Carretero, J. Carvalho, C. S. Casas, R. Casas, S. CASTELLANO, MARCO Castignani, G. CAVUOTI, STEFANO Cledassou, R. Colodro-Conde, C. Congedo, G. Conselice, C. J. Conversi, L. Copin, Y. CORCIONE, Leonardo Coupon, J. Courtois, H. M. Da Silva, A. de la Torre, S. Di Ferdinando, D. Duncan, C. A. J. Dupac, X. Fabbian, G. Farrens, S. Ferreira, P. G. FINELLI, FABIO FRAILIS, Marco FRANCESCHI, ENRICO GALEOTTA, Samuele GARILLI, BIANCA MARIA ROSA GIOCOLI, Carlo Gozaliasl, G. Graciá-Carpio, J. Grupp, F. Guzzo, L. Holmes, W. Hormuth, F. Israel, H. Jahnke, K. Keihanen, E. Kermiche, S. Kirkpatrick, C. C. Kubik, B. Kunz, M. Kurki-Suonio, H. LIGORI, Sebastiano Lilje, P. B. Lloro, I. Maino, D. Marggraf, O. Markovic, K. Martinet, N. Marulli, F. Massey, R. Mauri, N. Maurogordato, S. Medinaceli, E. MENEGHETTI, MASSIMO Metcalf, B. Meylan, G. Moresco, M. Morin, B. Moscardini, L. Munari, Emiliano Neissner, C. Niemi, S. M. Padilla, C. Paltani, S. Pasian, F. Patrizii, L. Pettorino, V. |
Issue Date: | 2021 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 505 | Issue: | 2 | First Page: | 2840 | Abstract: | We present a new, updated version of the EuclidEmulator (called EuclidEmulator2), a fast and accurate predictor for the nonlinear correction of the matter power spectrum. 2 per cent level accurate emulation is now supported in the eight-dimensional parameter space of w<SUB>0</SUB>w<SUB>a</SUB>CDM+∑m<SUB>ν</SUB> models between redshift z = 0 and z = 3 for spatial scales within the range $0.01 \, h\, {\rm Mpc}^{-1}\le k \le 10\, h\, {\rm Mpc}^{-1}$. In order to achieve this level of accuracy, we have had to improve the quality of the underlying N-body simulations used as training data: (i) we use self-consistent linear evolution of non-dark matter species such as massive neutrinos, photons, dark energy, and the metric field, (ii) we perform the simulations in the so-called N-body gauge, which allows one to interpret the results in the framework of general relativity, (iii) we run over 250 high-resolution simulations with 3000<SUP>3</SUP> particles in boxes of 1(h<SUP>-1</SUP> Gpc)<SUP>3</SUP> volumes based on paired-and-fixed initial conditions, and (iv) we provide a resolution correction that can be applied to emulated results as a post-processing step in order to drastically reduce systematic biases on small scales due to residual resolution effects in the simulations. We find that the inclusion of the dynamical dark energy parameter w<SUB>a</SUB> significantly increases the complexity and expense of creating the emulator. The high fidelity of EuclidEmulator2 is tested in various comparisons against N-body simulations as well as alternative fast predictors such as HALOFIT, HMCode, and CosmicEmu. A blind test is successfully performed against the Euclid Flagship v2.0 simulation. Nonlinear correction factors emulated with EuclidEmulator2 are accurate at the level of $1{{\ \rm per\ cent}}$ or better for $0.01 \, h\, {\rm Mpc}^{-1}\le k \le 10\, h\, {\rm Mpc}^{-1}$ and z ≤ 3 compared to high-resolution dark-matter-only simulations. EuclidEmulator2 is publicly available at https://github.com/miknab/EuclidEmulator2. | URI: | http://hdl.handle.net/20.500.12386/32265 | URL: | http://arxiv.org/abs/2010.11288v1 https://academic.oup.com/mnras/article/505/2/2840/6275725?login=true |
ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stab1366 | Bibcode ADS: | 2021MNRAS.505.2840E | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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euclid_emul2_strip.pdf | PDF editoriale | 6.07 MB | Adobe PDF | View/Open |
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