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Physical Review D

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Future CMB constraints on early, cold, or stressed dark energy

Erminia Calabrese¹, Roland de Putter^2,3,4, Dragan Huterer⁵, Eric V. Linder^4,6, and Alessandro Melchiorri¹

¹Physics Department and INFN, Universita’ di Roma “La Sapienza,” Ple Aldo Moro 2, 00185, Rome, Italy
²IFIC, Universidad de Valencia–CSIC, Valencia, Spain
³Institut de Ciencies del Cosmos, Barcelona, Spain
⁴Berkeley Lab and University of California, Berkeley, California 94720, USA
⁵Department of Physics, University of Michigan, 450 Church Street, Ann Arbor, Michigan 48109, USA.
⁶Institute for the Early Universe, Ewha Womans University, Seoul, Korea

Phys. Rev. D 83, 023011 – Published 19 January, 2011

DOI: https://doi.org/10.1103/PhysRevD.83.023011

Abstract

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 parametrized 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.

Article Text

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