October 1, 2025 Dataset Open Access

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

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  <dc:creator>Akarsu, Özgür</dc:creator>
  <dc:creator>Di Valentino, Eleonora</dc:creator>
  <dc:creator>Vyskocil, Jiri</dc:creator>
  <dc:creator>Yılmaz, Ezgi</dc:creator>
  <dc:creator>Yükselci, A. Emrah</dc:creator>
  <dc:creator>Zhuk, Oleksandr</dc:creator>
  <dc:date>2025-10-01</dc:date>
  <dc:description>Matter power spectra presented in the associated paper are obtained from the datasets separately generated from N-body simulations with the relativistic code gevolution [1], and from calculations with the linear Boltzmann code CLASS [2], for matching cosmological best-fit parameters and background cosmologies. Regarding the latter element, we study two cases that are the concordance Lambda-Cold Dark Matter (ΛCDM) model and a late-time modification with a sign-switching vacuum sector (ΛsCDM), and for each model there are two best-fit parameter sets, derived from a Planck-only and a combined "full" dataset. 

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 available in the main paper. All runs are carried out in boxes of L=2080 Mpc/h with 0.5 h/Mpc resolution.

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.

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].

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].</dc:description>
  <dc:identifier>https://rodare.hzdr.de/record/4020</dc:identifier>
  <dc:identifier>10.14278/rodare.4020</dc:identifier>
  <dc:identifier>oai:rodare.hzdr.de:4020</dc:identifier>
  <dc:language>eng</dc:language>
  <dc:relation>url:https://www.hzdr.de/publications/Publ-41918</dc:relation>
  <dc:relation>url:https://www.hzdr.de/publications/Publ-42108</dc:relation>
  <dc:relation>doi:10.14278/rodare.4019</dc:relation>
  <dc:relation>url:https://rodare.hzdr.de/communities/hzdr</dc:relation>
  <dc:relation>url:https://rodare.hzdr.de/communities/rodare</dc:relation>
  <dc:rights>info:eu-repo/semantics/openAccess</dc:rights>
  <dc:rights>https://creativecommons.org/licenses/by/4.0/legalcode</dc:rights>
  <dc:subject>cosmological N-body simulations</dc:subject>
  <dc:subject>sign switching cosmological constant</dc:subject>
  <dc:subject>matter power spectrum</dc:subject>
  <dc:title>Data: Nonlinear Matter Power Spectrum from relativistic N-body Simulations: ΛsCDM versus ΛCDM</dc:title>
  <dc:type>info:eu-repo/semantics/other</dc:type>
  <dc:type>dataset</dc:type>
</oai_dc:dc>