Dark energy from a scale-free distribution

• Published in: Europhysics letters Vol. 94; no. 4; pp. 49002 - 49007
• Main Authors: Iannone, G, Luongo, O
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.05.2011; EPS, SIF, EDP Sciences and IOP Publishing
• Subjects: 98.80.-k; 98.80.Es; 98.80.Jk
• ISSN: 0295-5075; 1286-4854
• DOI: 10.1209/0295-5075/94/49002

We investigate some intriguing consequences of characterizing dark energy by the so-called scale-free statistics in a flat Friedman-Robertson-Walker cosmology. We adopt a toy model, derived from a power law distribution, being P(k)∼k− γ, with 2<γ< 3, showing as a result that the dynamics mimics the ΛCDM paradigm at low redshift, whereas it gives a varying equation of state around the value w∼− 1 for higher redshift. In addition, we test the equation of state with the modern cosmological data and we make a comparison with the observational constraints.