TY - GEN
T1 - High accuracy spectra at high z in dynamical dark energy simulations
AU - Casarini, L.
AU - Macciò, A. V.
AU - Bonometto, S. A.
PY - 2010
Y1 - 2010
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
AN - SCOPUS:77955698882
SN - 9780735407893
T3 - AIP Conference Proceedings
SP - 759
EP - 766
BT - Invisible Universe International Conference
T2 - Invisible Universe International Conference
Y2 - 29 June 2009 through 3 July 2009
ER -