2006/01/01 by Roberto Mainini, L. P. L. Colombo, Loris Colombo +2 · 1 citation
Mathematics · Physics and Astronomy · #Astrophysics #Axion #CMB cold spot #Cosmic microwave background #Cosmology #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark energy #Dark matter #Hubble's law #Markov chain Monte Carlo #Mathematics #Monte Carlo method #Particle physics #Physics #Quantum mechanics #Quintessence #Scalar (mathematics) #Scalar field #Scientific Research and Discoveries #Statistical physics #Statistics #astro-ph
paper · pdf · doi:10.1063/1.2409095
Proceeding of the workshop dsu2006, "The Dark Side of th Universe", Madrid, June 20-24, 2006
openalex publication_date 2006/01/01 · arxiv created 2006/09/20 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The strong CP problem was solved by Peccei & Quinn by introducing axions, which are a viable candidate for Dark Matter (DM). Here the PQ approach is modified so to yield also Dark Energy (DE), which arises in fair proportions, without tuning any extra parameter. DM and DE arise from a single scalar field and, in the present ecpoch, are weakly coupled. Fluctuations have a fair evolution. The model is also fitted to WMAP first‐year release, using a Markov Chain Monte Carlo technique, and performs as well as ΛCDM, coupled or uncoupled DE. Best‐fit cosmological parameters for different models are mostly within 2‐σ level. The main peculiarity of the model is to favor high values of the Hubble parameter.