Variation of fundamental parameters and dark energy. A principal component approach

Details Variation of fundamental parameters and dark energy. A principal component approach Variation of fundamental parameters and dark energy. A principal component approach

2011-09-30

arxiv.org/abs/1109.6793v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

8 pages, 7 figures

Scientific paper

We discuss methods based on Principal Component Analysis for reconstructing the dark energy equation of state and constraining its evolution, using a combination of Type Ia supernovae at low redshift and spectroscopic measurements of varying fundamental couplings at higher redshifts. We discuss the performance of this method when future better-quality datasets are available, focusing on two forthcoming ESO spectrographs -- ESPRESSO for the VLT and CODEX for the E-ELT -- which include these measurements as a key part of their science cases. These can realize the prospect of a detailed characterization of dark energy properties all the way up to redshift 4.

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