Probing the coupling between dark components of the universe

2007/02/28 by Zong-Kuan Guo, Nobuyoshi Ohta, Shinji Tsujikawa · 389 citations
Physics and Astronomy · #Anisotropy #Astrophysics #Baryon acoustic oscillations #CMB cold spot #Cosmic microwave background #Cosmology #Cosmology and Gravitation Theories #Coupling (piping) #Dark Matter and Cosmic Phenomena #Dark energy #Equation of state #Galaxies: Formation, Evolution, Phenomena #Hubble's law #Physics #Quantum mechanics #Redshift #Supernova #Universe #astro-ph #gr-qc #hep-th

paper · pdf · doi:10.1103/physrevd.76.023508

published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 76(2) (American Physical Society) · 9 pages, 7 figures, RevTeX, minor corrections, references added, accepted for publication in Phys. Rev. D

arxiv created 2007/06/12 · openalex publication_date 2007/07/16 · arxiv updated 2010/04/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We place observational constraints on a coupling between dark energy and dark matter by using 71 Type Ia supernovae (SNe Ia) from the first year of the five-year Supernova Legacy Survey (SNLS), the cosmic microwave background (CMB) shift parameter from the three-year Wilkinson Microwave Anisotropy Probe (WMAP), and the baryon acoustic oscillation (BAO) peak found in the Sloan Digital Sky Survey (SDSS). The interactions we study are (i) constant coupling \ensuremathδ and (ii) varying coupling \ensuremathδ(z) that depends on a redshift z, both of which have simple parametrizations of the Hubble parameter to confront with observational data. We find that the combination of the three databases marginalized over a present dark energy density gives stringent constraints on the coupling, \ensuremath-0.08<\ensuremathδ<0.03 (95% C.L.) in the constant coupling model and \ensuremath-0.4<\ensuremathδ₀<0.1 (95% C.L.) in the varying coupling model, where \ensuremathδ₀ is a present value. The uncoupled \ensuremathΛCDM model (w_X=\ensuremath-1 and \ensuremathδ=0) still remains a good fit to the data, but the negative coupling (\ensuremathδ<0) with the equation of state of dark energy w_X<\ensuremath-1 is slightly favored over the \ensuremathΛCDM model.

Citations

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• Observational constraints on holographic tachyonic dark energy in interaction with dark matter
• Interacting two-fluid viscous dark energy models in a non-flat universe
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• Some remarks on the attractor behaviour in ELKO cosmology
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• Testing the phenomenological interacting dark energy with observational H(z) data
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