Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-07-24
Phys.Rev.Lett.90:031301,2003
Astronomy and Astrophysics
Astrophysics
Unfeasibility of a truly model-independent reconstruction of w at z>1 illustrated. f(z) left out, and w(z) discussed in more d
Scientific paper
10.1103/PhysRevLett.90.031301
Considerable work has been devoted to the question of how to best parameterize the properties of dark energy, in particular its equation of state w. We argue that, in the absence of a compelling model for dark energy, the parameterizations of functions about which we have no prior knowledge, such as w(z), should be determined by the data rather than by our ingrained beliefs or familiar series expansions. We find the complete basis of orthonormal eigenfunctions in which the principal components (weights of w(z)) that are determined most accurately are separated from those determined most poorly. Furthermore, we show that keeping a few of the best-measured modes can be an effective way of obtaining information about w(z).
Huterer Dragan
Starkman Glenn
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