6533b7d2fe1ef96bd125e1b0
RESEARCH PRODUCT
Future CMB Constraints on Early, Cold, or Stressed Dark Energy
Erminia CalabreseAlessandro MelchiorriEric V. LinderEric V. LinderDragan HutererRoland De PutterRoland De Puttersubject
PhysicsNuclear and High Energy PhysicsCosmology and Nongalactic Astrophysics (astro-ph.CO)010308 nuclear & particles physicsCosmic microwave backgroundCosmic background radiationFOS: Physical sciencesSpectral densityAstrophysicsAstrophysics::Cosmology and Extragalactic Astrophysics01 natural sciencesMassless particlesymbols.namesake13. Climate action0103 physical sciencesDark energysymbolsNeutrinoPlanck010303 astronomy & astrophysicsQBLeptonAstrophysics - Cosmology and Nongalactic Astrophysicsdescription
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 c_s^2 <1 (cold dark energy) and anisotropic stresses parameterized with a viscosity parameter c_vis^2. 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 c_s^2. 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 weakened by a factor of 2 when allowing for the presence of EDE, and highly biased if it is incorrectly ignored.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2011-01-19 |