Gravitational Lensing Constraints on Dynamical and Coupled Dark Energy

TL;DR

This paper evaluates how upcoming weak lensing surveys, combined with CMB data, can significantly improve constraints on dark energy properties, especially when considering dark energy-dark matter coupling.

Contribution

It demonstrates the enhanced constraining power of tomographic weak lensing data on dark energy parameters, particularly in models with DE-DM coupling, using Fisher matrix analysis.

Findings

WL data improves parameter detection when combined with CMB data.

Strong impact on constraints when considering DE-DM coupling.

WL tomography reduces errors on some parameters by factors >10.

Abstract

Upcoming Weak Lensing (WL) surveys can be used to constrain Dark Energy (DE) properties, namely if tomographic techniques are used to improve their sensitivity. In this work, we use a Fisher matrix technique to compare the power of CMB anisotropy and polarization data with tomographic WL data, in constraining DE parameters. Adding WL data to available CMB data improves the detection of all cosmological parameters, but the impact is really strong when DE--DM coupling is considered, as WL tomography can then succeed to reduce the errors on some parameters by factors >10.