Dark Matter, Dark Energy and the solution of the strong CP problem

Roberto Mainini; Loris Colombo; Silvio Bonometto

doi:10.1063/1.2409095

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Dark Matter, Dark Energy and the solution of the strong CP problem

Roberto Mainini·Loris Colombo·Silvio Bonometto

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Abstract

The strong CP problem was solved by Peccei & Quinn by introducing axions, a viable candidate for Dark Matter (DM). Here the PQ approach is modified so to yield also Dark Energy (DE). DM and DE arise, in fai proportions, from a single scalar field, without tuning any extra parameter. In the present epoch, they are weakly coupled. Fluctuations have a fair evolution. The model is also fitted to the WMAP1 release, using a Markov Chain Monte Carlo technique, and performs as well as $Λ$CDM, coupled or uncoupled DE. Best--fit cosmological parameters for different models are mostly within 2--$σ$ level. Here, the main peculiarity of the model is to favor high values of the Hubble parameter.

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Roberto Mainini, Loris Colombo, Silvio Bonometto. 2006-09-20. Dark Matter, Dark Energy and the solution of the strong CP problem. https://doi.org/10.1063/1.2409095

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