Dynamical dark energy simulations

High accuracy power spectra at high redshift

Luciano Casarini, Andrea Maccio, Silvio A. Bonometto

    Research output: Contribution to journalArticle

    Abstract

    Accurate predictions on non-linear power spectra, at various redshift z, will be a basic tool to interpret cosmological data from next generation mass probes, so obtaining key information on Dark Energy nature. This calls for high precision simulations, covering the whole functional space of w(z) state equations and taking also into account the admitted ranges of other cosmological parameters; surely a difficult task. A procedure was however suggested, able to match the spectra at z = 0, up to k ∼ 3hMpc -1, in cosmologies with an (almost) arbitrary w(z), by making recourse to the results of N-body simulations with w = const. In this paper we extend such procedure to high redshift and test our approach through a series of N-body gravitational simulations of various models, including a model closely fitting WMAP5 and complementary data. Our approach detects w = const. models, whose spectra meet the requirement within 1% at z = 0 and perform even better at higher redshift, where they are close to a permil precision. Available Halofit expressions, extended to (constant) w-1 are unfortunately unsuitable to fit the spectra of the physical models considered here. Their extension to cover the desired range should be however feasible, and this will enable us to match spectra from any DE state equation.

    Original languageEnglish (US)
    Article number014
    JournalJournal of Cosmology and Astroparticle Physics
    Volume2009
    Issue number3
    DOIs
    StatePublished - May 25 2009

    Fingerprint

    dark energy
    power spectra
    equations of state
    simulation
    coverings
    requirements
    probes
    predictions

    Keywords

    • Cosmological simulations
    • Gravitational lensing
    • Power spectrum

    ASJC Scopus subject areas

    • Astronomy and Astrophysics

    Cite this

    Dynamical dark energy simulations : High accuracy power spectra at high redshift. / Casarini, Luciano; Maccio, Andrea; Bonometto, Silvio A.

    In: Journal of Cosmology and Astroparticle Physics, Vol. 2009, No. 3, 014, 25.05.2009.

    Research output: Contribution to journalArticle

    Casarini, Luciano ; Maccio, Andrea ; Bonometto, Silvio A. / Dynamical dark energy simulations : High accuracy power spectra at high redshift. In: Journal of Cosmology and Astroparticle Physics. 2009 ; Vol. 2009, No. 3.
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