Dark energy from a scale-free distribution

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 mimic...

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Bibliographic Details
Published inEurophysics letters Vol. 94; no. 4; pp. 49002 - 49007
Main Authors Iannone, G, Luongo, O
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.05.2011
EPS, SIF, EDP Sciences and IOP Publishing
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Summary: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.
Bibliography:ark:/67375/80W-WMPWNK7K-M
istex:7D47512E7FC194E28D4F8A852A371B60E164C85F
publisher-ID:epl13488
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/94/49002