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Dark energy can be studied by its influence on the expansion of the Universeas well as on the growth history of the large-scale structure. In this paper,we follow the growth of the cosmic density field in early dark energycosmologies by combining observations of the primary CMB temperature andpolarisation power spectra at high redshift, of the CMB lensing deflectionfield at intermediate redshift and of weak cosmic shear at low redshifts forconstraining the allowed amount of early dark energy. We present theseforecasts using the Fisher-matrix formalism and consider the combination ofPlanck-data with the weak lensing survey of Euclid. We find that combiningthese data sets gives powerful constraints on early dark energy and is able tobreak degeneracies in the parameter set inherent to the various observationalchannels. The derived statistical 1-sigma-bound on the early dark energydensity parameter is sigma(Omega_d^e)=0.0022 which suggests that early darkenergy models can be well examined in our approach. In addition, we derive thedark energy figure of merit for the considered dark energy parameterisation andcomment on the applicability of the growth index to early dark energycosmologies.

Constraints on early dark energy from CMB lensing and weak lensing tomography