Future CMB constraints on early, cold, or stressed dark energy
- Erminia Calabrese
- R. De Putter
- Dragan Huterer
- Eric V. Linder
- Alessandro Melchiorri
DOIAbstract
We investigate future constraints on early dark energy (EDE) achievable by the Planck and CMBPol experiments, including cosmic microwave background (CMB) lensing. For the dark energy, we include the possibility of clustering through a sound speed cs2<1 (cold dark energy) and anisotropic stresses parametrized with a viscosity parameter cvis2. We discuss the degeneracies between cosmological parameters and EDE parameters. In particular we show that the presence of anisotropic stresses in EDE models can substantially undermine the determination of the EDE sound speed parameter cs2. The constraints on EDE primordial energy density are however unaffected. We also calculate the future CMB constraints on neutrino masses and find that they are weak...
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