Non-parametric Dark Energy Degeneracies

Details Non-parametric Dark Energy Degeneracies Non-parametric Dark Energy Degeneracies

2008-01-24

arxiv.org/abs/0801.3847v1

General Relativity and Gravitation, Volume 40, Issue 2-3, pp. 285-300 (2008)

Astronomy and Astrophysics

Astrophysics

10 pages, 8 figures. Invited Review for special issue of General Relativity and Gravitation issue on Dark Energy, eds. G. F.R

Scientific paper

10.1007/s10714-007-0548-6

We study the degeneracies between dark energy dynamics, dark matter and curvature using a non-parametric and non-perturbative approach. This allows us to examine the knock-on bias induced in the reconstructed dark energy equation of state, w(z), when there is a bias in the cosmic curvature or dark matter content, without relying on any specific parameterisation of w. Even assuming perfect Hubble, distance and volume measurements, we show that for z > 1, the bias in w(z) is up to two orders of magnitude larger than the corresponding errors in Omega_k or Omega_m. This highlights the importance of obtaining unbiased estimators of all cosmic parameters in the hunt for dark energy dynamics.

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