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

Journal Article · Sat Jan 15 00:00:00 EST 2011 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.83.023011· OSTI ID:21513060

Calabrese, Erminia; Melchiorri, Alessandro ^[1]; Putter, Roland de ^[2]; Huterer, Dragan ^[3]; Linder, Eric V ^[4]

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1. Physics Department and INFN, Universita' di Roma 'La Sapienza', Ple Aldo Moro 2, 00185, Rome (Italy)
2. IFIC, Universidad de Valencia-CSIC, Valencia (Spain)
3. Department of Physics, University of Michigan, 450 Church Street, Ann Arbor, Michigan 48109, USA. (United States)
4. Berkeley Lab and University of California, Berkeley, California 94720 (United States)

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{sub s}{sup 2}<1 (cold dark energy) and anisotropic stresses parametrized with a viscosity parameter c{sub vis}{sup 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{sub s}{sup 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.

• OSTI ID: 21513060
• Journal Information: Physical Review. D, Particles Fields, Vol. 83, Issue 2; Other Information: DOI: 10.1103/PhysRevD.83.023011; (c) 2011 American Institute of Physics; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ANISOTROPY
COMPUTERIZED SIMULATION
ENERGY DENSITY
GRAVITATIONAL LENSES
MASS
NEUTRINOS
NONLUMINOUS MATTER
RELICT RADIATION
SOUND WAVES
VELOCITY
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
FERMIONS
LENSES
LEPTONS
MASSLESS PARTICLES
MATTER
MICROWAVE RADIATION
RADIATIONS
SIMULATION