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

Calabrese, Erminia ORCID: https://orcid.org/0000-0003-0837-0068, de Putter, Roland, Huterer, Dragan, Linder, Eric V. and Melchiorri, Alessandro 2011. Future CMB constraints on early, cold, or stressed dark energy. Physical Review D 83 (2) , 023011. 10.1103/PhysRevD.83.023011

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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 c2s<1 (cold dark energy) and anisotropic stresses parametrized with a viscosity parameter c2vis. 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 c2s. 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.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Publisher:	American Physical Society
ISSN:	1550-7998
Date of First Compliant Deposit:	10 October 2017
Date of Acceptance:	4 November 2010
Last Modified:	04 May 2023 19:15
URI:	https://orca.cardiff.ac.uk/id/eprint/105355

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