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. We need then high precision simulations, exploring the functional space of w ( a ) DE state equations, for the admitted cosmological parameter ranges. A procedure was however suggested, making recourse to suitable w = const. auxiliary models , and yielding a ∼1% precision at z = 0 . The precision of this procedure, however, worsens at higher z. Here we follow a different criterion for high z. Our N–body gravitational simulations then show that auxiliary w = const. models still meet given w ( a ) model spectra within 1% at z = 0 , but are much better at higher redshift, where they approach a permil precision.
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