High accuracy spectra at high z in dynamical dark energy simulations

L. Casarini, A. V. Macciò, S. A. Bonometto

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Non-linear power spectra, at various redshift z, will be measured by the next generation mass probes, and this will allow to investigate the nature of DE. Seemingly, to exploit such data, we however need high precision spectral predictions, spanning the functional space of w(a) DE state equations, for the admitted cosmological parameter ranges. In this paper we show that data analysis can be simplified, by comparing them with w=const. models only, although allowing for different w's at different z. The point we test is that, at a any redshift z, spectra depend just on the r.m.s. fluctuation amplitude σ8(z), the reduced density parameters ωb,c and the distance dLSB(z) from the Last Scattering Band. We test this through N-body simulations, by comparing dynamical DE models and auxiliary w=const. models. We find spectral discrepancies steadily <1%, but even smaller at higher redshift, where spectra approach a permil precision. An implicit conclusion, however, is that any w(z) law, deduced from data at various z, by testing them against constant-w models, is not the actual z-dependence of the DE state parameter.

Original languageEnglish (US)
Title of host publicationInvisible Universe International Conference
Number of pages8
StatePublished - 2010
EventInvisible Universe International Conference - Paris, France
Duration: Jun 29 2009Jul 3 2009

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


OtherInvisible Universe International Conference


  • dynamical dark energy
  • n-body simulations
  • non linear power spectrum

ASJC Scopus subject areas

  • General Physics and Astronomy


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