October 1, 2025 Dataset Open Access

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

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    <subfield code="a">&lt;p&gt;Matter power spectra presented in the associated&amp;nbsp;paper are obtained from the datasets separately generated from N-body simulations with the relativistic code&amp;nbsp;&lt;em&gt;gevolution &lt;/em&gt;[1], and from calculations with the linear Boltzmann code CLASS [2], for matching cosmological best-fit parameters and background&amp;nbsp;cosmologies.&amp;nbsp;Regarding the latter element, we study two cases that are the concordance Lambda-Cold Dark Matter (&amp;Lambda;CDM) model and a late-time modification with a sign-switching vacuum sector&amp;nbsp;(&amp;Lambda;sCDM), and for each model there are two best-fit parameter sets, derived from a&amp;nbsp;&lt;em&gt;Planck&lt;/em&gt;-only and a combined &amp;quot;full&amp;quot; dataset.&amp;nbsp;&lt;/p&gt;

&lt;p&gt;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&amp;nbsp;available in the main paper. All runs are carried out in boxes of L=2080 Mpc/h with 0.5 h/Mpc resolution.&lt;/p&gt;

&lt;p&gt;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.&lt;/p&gt;

&lt;p&gt;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].&lt;/p&gt;

&lt;p&gt;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].&lt;/p&gt;</subfield>
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    <subfield code="a">Data: Nonlinear Matter Power Spectrum from relativistic N-body Simulations: ΛsCDM versus ΛCDM</subfield>
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