October 1, 2025 Dataset Open Access

Akarsu, Özgür; Di Valentino, Eleonora; Vyskocil, Jiri; Yılmaz, Ezgi; Yükselci, A. Emrah; Zhuk, Oleksandr

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    "title": "Data: Nonlinear Matter Power Spectrum from relativistic N-body Simulations: \u039bsCDM versus \u039bCDM", 
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    "description": "<p>Matter power spectra presented in the associated&nbsp;paper are obtained from the datasets separately generated from N-body simulations with the relativistic code&nbsp;<em>gevolution </em>[1], and from calculations with the linear Boltzmann code CLASS [2], for matching cosmological best-fit parameters and background&nbsp;cosmologies.&nbsp;Regarding the latter element, we study two cases that are the concordance Lambda-Cold Dark Matter (&Lambda;CDM) model and a late-time modification with a sign-switching vacuum sector&nbsp;(&Lambda;sCDM), and for each model there are two best-fit parameter sets, derived from a&nbsp;<em>Planck</em>-only and a combined &quot;full&quot; dataset.&nbsp;</p>\n\n<p>P(k) (power spectra) outputs from gevolution are computed at the four redshifts z=15, 2, 1, 0 for the density contrasts of total matter (CDM, baryons, and massive neutrinos) as well as CDM-baryons (cb)-only. A detailed explanation of how the matter sector is handled in simulations is&nbsp;available in the main paper. All runs are carried out in boxes of L=2080 Mpc/h with 0.5 h/Mpc resolution.</p>\n\n<p>Power spectra based on CLASS outputs are obtained from the transfer functions of CDM and baryons, and the respective background densities at z=15, 2, 1, 0. CLASS dataset for the latter is shown only up to z=100.</p>\n\n<p>1. J. Adamek, D. Daverio, R. Durrer, and M. Kunz, gevolution: a cosmological N-body code based on General Relativity, JCAP 07, 053. arXiv:1604.06065 [astro-ph.CO].</p>\n\n<p>2. D. Blas, J. Lesgourgues, and T. Tram, The Cosmic Linear Anisotropy Solving System (CLASS) II: Approximation schemes, JCAP 07, 034. arXiv:1104.2933 [astro-ph.CO].</p>", 
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    "creators": [
      {
        "affiliation": "Istanbul Technical University", 
        "name": "Akarsu, \u00d6zg\u00fcr"
      }, 
      {
        "affiliation": "School of Mathematical and Physical Sciences, University of Sheffield", 
        "name": "Di Valentino, Eleonora"
      }, 
      {
        "affiliation": "HZDR - CASUS", 
        "orcid": "0000-0001-8822-0929", 
        "name": "Vyskocil, Jiri"
      }, 
      {
        "affiliation": "Deutsches Zentrum f\u00fcr Astrophysik", 
        "name": "Y\u0131lmaz, Ezgi"
      }, 
      {
        "affiliation": "Istanbul Technical University", 
        "name": "Y\u00fckselci, A. Emrah"
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        "affiliation": "HZDR - CASUS", 
        "name": "Zhuk, Oleksandr"
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    "pub_id": "41918", 
    "doi": "10.14278/rodare.4020", 
    "language": "eng", 
    "keywords": [
      "cosmological N-body simulations", 
      "sign switching cosmological constant", 
      "matter power spectrum"
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