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We use the recent type Ia supernova, cosmic microwave background andlarge-scale structure data to shed light on the temporal evolution of the darkenergy equation of state $w(z)$ out to redshift one. We constrain the mostflexible parametrization of dark energy to date, and include the dark energyperturbations consistently throughout. Interpreting our results via theprincipal component analysis, we find no significant evidence for dynamicaldark energy: the cosmological constant model is consistent with data everywherebetween redshift zero and one at 95% C.L.

High-resolution temporal constraints on the dynamics of dark energy