Complementarity of Future Dark Energy Probes

TL;DR

This paper evaluates how future dark energy surveys like EUCLID and SKA can constrain the equation of state of dark energy across different redshifts, highlighting their complementarity and effectiveness.

Contribution

It adapts a binning approach to the dark energy equation of state and analyzes multiple future surveys to determine their constraining power and complementarity.

Findings

EUCLID can constrain about three significant modes of 'w'

BAO surveys effectively probe high redshift 'w'

Surveys are complementary in constraining dark energy evolution

Abstract

In recent years a plethora of future surveys have been suggested to constrain the nature of dark energy. In this paper we adapt a binning approach to the equation of state factor ``w'' and discuss how future weak lensing, galaxy cluster counts, Supernovae and baryon acoustic oscillation surveys constrain the equation of state at different redshifts. We analyse a few representative future surveys, namely DES, PS1, WFMOS, PS4, EUCLID, SNAP and SKA, and perform a principal component analysis for the ``w'' bins. We also employ a prior from Planck cosmic microwave background measurements on the remaining cosmological parameters. We study at which redshifts a particular survey constrains the equation of state best and how many principal components are significantly determined. We then point out which surveys would be sufficiently complementary. We find that weak lensing surveys, like EUCLID, would constrain the equation of state best and would be able to constrain of the order of three significant modes. Baryon acoustic oscillation surveys on the other hand provide a unique opportunity to probe the equation of state at relatively high redshifts.