2009

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

Hollenstein, Lukas, Sapone, Domenico, Crittenden, Robert et al.

Understand

Dark energy can be studied by its influence on the expansion of the Universe as 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 energy cosmologies by combining observations of the primary CMB temperature and polarisation power spectra at high redshift, of the CMB lensing deflection field at intermediate redshift and of weak cosmic shear at low redshifts for constraining the allowed amount of early dark energy.
We present these forecasts using the Fisher-matrix formalism and consider the combination of Planck-data with the weak lensing survey of Euclid.
We find that combining these data sets gives powerful constraints on early dark energy and is able to break degeneracies in the parameter set inherent to the various observational channels.

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