Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-04-12
Astropart.Phys. 26 (2006) 102-110
Astronomy and Astrophysics
Astrophysics
9 pages, 6 figures; minor changes (cooler Fig. 1) to match Astroparticle Physics version
Scientific paper
10.1016/j.astropartphys.2006.05.
In the quest for precision cosmology, one must ensure that the cosmology is accurate as well. We discuss figures of merit for determining from observations whether the dark energy is a cosmological constant or dynamical, with special attention to the best determined equation of state value, at the ``pivot'' or decorrelation redshift. We show this is not necessarily the best lever on testing consistency with the cosmological constant, and moreover is subject to bias. The standard parametrization of w(a)=w_0+w_a(1-a) by contrast is quite robust, as tested by extensions to higher order parametrizations and modified gravity. Combination of complementary probes gives strong immunization against inaccurate, but precise, cosmology.
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