### Abstract

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 σ_{8}(z), the reduced density parameters ω_{b,c} and the distance d_{LSB}(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 language | English (US) |
---|---|

Title of host publication | Invisible Universe International Conference |

Pages | 759-766 |

Number of pages | 8 |

Volume | 1241 |

DOIs | |

State | Published - Aug 23 2010 |

Event | Invisible Universe International Conference - Paris, France Duration: Jun 29 2009 → Jul 3 2009 |

### Other

Other | Invisible Universe International Conference |
---|---|

Country | France |

City | Paris |

Period | 6/29/09 → 7/3/09 |

### Fingerprint

### Keywords

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

### ASJC Scopus subject areas

- Physics and Astronomy(all)

### Cite this

*Invisible Universe International Conference*(Vol. 1241, pp. 759-766) https://doi.org/10.1063/1.3462713

**High accuracy spectra at high z in dynamical dark energy simulations.** / Casarini, L.; Maccio, Andrea; Bonometto, S. A.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

*Invisible Universe International Conference.*vol. 1241, pp. 759-766, Invisible Universe International Conference, Paris, France, 6/29/09. https://doi.org/10.1063/1.3462713

}

TY - GEN

T1 - High accuracy spectra at high z in dynamical dark energy simulations

AU - Casarini, L.

AU - Maccio, Andrea

AU - Bonometto, S. A.

PY - 2010/8/23

Y1 - 2010/8/23

N2 - 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.

AB - 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.

KW - dynamical dark energy

KW - n-body simulations

KW - non linear power spectrum

UR - http://www.scopus.com/inward/record.url?scp=77955698882&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77955698882&partnerID=8YFLogxK

U2 - 10.1063/1.3462713

DO - 10.1063/1.3462713

M3 - Conference contribution

SN - 9780735407893

VL - 1241

SP - 759

EP - 766

BT - Invisible Universe International Conference

ER -