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  Euclid preparation: IX. EuclidEmulator2 – power spectrum emulation with massive neutrinos and self-consistent dark energy perturbations

Knabenhans, M., Stadel, J., Potter, D., Dakin, J., Hannestad, S., Tram, T., et al. (2021). Euclid preparation: IX. EuclidEmulator2 – power spectrum emulation with massive neutrinos and self-consistent dark energy perturbations. Monthly Notices of the Royal Astronomical Society, 505(2), 2840-2869. doi:10.1093/mnras/stab1366.

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Knabenhans, M., Author
Stadel, J., Author
Potter, D., Author
Dakin, J., Author
Hannestad, S., Author
Tram, T., Author
Marelli, S., Author
Schneider, A., Author
Teyssier, R., Author
Fosalba, P., Author
Andreon, S., Author
Auricchio, N., Author
Baccigalupi, C., Author
Balaguera-Antolınez, A., Author
Baldi, M., Author
Bardelli, S., Author
Battaglia, P., Author
Bender, R.1, Author           
Biviano, A., Author
Bodendorf, C.1, Author           
Bozzo, E., AuthorBranchini, E., AuthorBrescia, M., AuthorBurigana, C., AuthorCabanac, R., AuthorCamera, S., AuthorCapobianco, V., AuthorCappi, A., AuthorCarbone, C., AuthorCarretero, J., AuthorCarvalho, C. S., AuthorCasas, R., AuthorCasas, S., AuthorCastellano, M., AuthorCastignani, G., AuthorCavuoti, S., AuthorCledassou, R., AuthorColodro-Conde, C., AuthorCongedo, G., AuthorConselice, C. J., AuthorConversi, L., AuthorCopin, Y., AuthorCorcione, L., AuthorCoupon, J., AuthorCourtois, H. M., AuthorSilva, A. Da, Authorde la Torre, S., AuthorFerdinando, D. Di, AuthorDuncan, C. A. J., AuthorDupac, X., AuthorFabbian, G., AuthorFarrens, S., AuthorFerreira, P. G., AuthorFinelli, F., AuthorFrailis, M., AuthorFranceschi, E., AuthorGaleotta, S., AuthorGarilli, B., AuthorGiocoli, C., AuthorGozaliasl, G., AuthorGracia-Carpio, J.2, Author           Grupp, F.1, Author           Guzzo, L., AuthorHolmes, W., AuthorHormuth, F., AuthorIsrael, H., AuthorJahnke, K., AuthorKeihanen, E., AuthorKermiche, S., AuthorKirkpatrick, C. C., AuthorKubik, B., AuthorKunz, M., AuthorKurki-Suonio, H., AuthorLigori, S., AuthorLilje, P. B., AuthorLloro, I., AuthorMaino, D., AuthorMarggraf, O., AuthorMarkovic, K., AuthorMartinet, N., AuthorMarulli, F., AuthorMassey, R., AuthorMauri, N., AuthorMaurogordato, S., AuthorMedinaceli, E., AuthorMeneghetti, M., AuthorMetcalf, B., AuthorMeylan, G., AuthorMoresco, M., AuthorMorin, B., AuthorMoscardini, L., AuthorMunari, E., AuthorNeissner, C., AuthorNiemi, S. M., AuthorPadilla, C., AuthorPaltani, S., AuthorPasian, F., AuthorPatrizii, L., AuthorPettorino, V., AuthorPires, S., AuthorPolenta, G., AuthorPoncet, M., AuthorRaison, F.1, Author           Renzi, A., AuthorRhodes, J., AuthorRiccio, G., AuthorRomelli, E., AuthorRoncarelli, M., AuthorSaglia, R.1, Author           Sanchez, A. G.1, Author           Sapone, D., AuthorSchneider, P., AuthorScottez, V., AuthorSecroun, A., AuthorSerrano, S., AuthorSirignano, C., AuthorSirri, G., AuthorStanco, L., AuthorSureau, F., AuthorCrespı, P. Tallada, AuthorTaylor, A. N., AuthorTenti, M., AuthorTereno, I., AuthorToledo-Moreo, R., AuthorTorradeflot, F., AuthorValenziano, L., AuthorValiviita, J., AuthorVassallo, T., AuthorViel, M., AuthorWang, Y., AuthorWelikala, N., AuthorWhittaker, L., AuthorZacchei, A., AuthorZucca, E., Author more..
1Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159895              
2Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159889              


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 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 w0waCDM+∑mν models between redshift z = 0 and z = 3 for spatial scales within the range 0.01hMpc−1≤k≤10hMpc−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 30003 particles in boxes of 1(h−1 Gpc)3 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 wa 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 per cent or better for 0.01hMpc−1≤k≤10hMpc−1 and z ≤ 3 compared to high-resolution dark-matter-only simulations. EuclidEmulator2 is publicly available at https://github.com/miknab/EuclidEmulator2.


Language(s): eng - English
 Dates: 2021-05-14
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1093/mnras/stab1366
 Degree: -



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Title: Monthly Notices of the Royal Astronomical Society
  Abbreviation : Mon. Not. Roy. Astron. Soc.
Source Genre: Journal
Publ. Info: -
Pages: - Volume / Issue: 505 (2) Sequence Number: - Start / End Page: 2840 - 2869 Identifier: ISSN: 0035-8711
ISSN: 1365-8711