Abstract
We study how observationally to distinguish between a cosmological constant (CC) and an evolving dark energy with equation of state ω(Z). We focus on the value of redshift Z ∗ at which the cosmic late time acceleration begins and \(\ddot{a}(Z^{*}) = 0\). Four ω(Z) are studied, including the well-known CPL model and a new model that has advantages when describing the entire expansion era, ∞>Z>−1, such that the future 0>Z>−1 is also sensibly described. If dark energy is represented by a CC model with ω≡−1, the present ranges for Ω Λ (t 0) and Ω m (t 0) imply that Z ∗=0.743 with 4% error. We discuss the possible implications of a model-independent measurement of Z ∗ with better accuracy.
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Frampton, P.H., Ludwick, K.J. Seeking evolution of dark energy. Eur. Phys. J. C 71, 1735 (2011). https://doi.org/10.1140/epjc/s10052-011-1735-x
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DOI: https://doi.org/10.1140/epjc/s10052-011-1735-x