1110.5328 (Christian L Reichardt et al.)

New limits on Early Dark Energy from the South Pole Telescope    [PDF]

Christian L Reichardt, Roland de Putter, Oliver Zahn, Zhen Hou

We present new limits on early dark energy from the cosmic microwave background (CMB) using data from the WMAP satellite on large angular scales and South Pole Telescope (SPT) on small angular scales. We find a strong upper limit on the early dark energy density of Omega_e < 0.018 at 95% confidence, a factor of three improvement over WMAP data alone. We show that adding lower-redshift probes of the expansion rate to the CMB data improves constraints on the dark energy equation of state, but not the early dark energy density. We also explain how the small-scale CMB temperature anisotropy constrains early dark energy.

View original: http://arxiv.org/abs/1110.5328