Volume 94, Number 4, May 2011
|Number of page(s)||6|
|Section||Geophysics, Astronomy and Astrophysics|
|Published online||04 May 2011|
Dark energy from a scale-free distribution
Dipartimento di Fisica, Università di Roma “La Sapienza” - Piazzale Aldo Moro 5, I-00185, Roma, Italy, EU
2 Dipartimento di Scienze Fisiche, Università di Napoli “Federico II” - Via Cinthia, I-80126, Napoli, Italy, EU
3 Dipartimento di Fisica “E. R. Caianiello”, Università di Salerno - I-84081, Salerno, Italy, EU
4 Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México - México
Accepted: 5 April 2011
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.
PACS: 98.80.-k – Cosmology / 98.80.Jk – Mathematical and relativistic aspects of cosmology / 98.80.Es – Observational cosmology (including Hubble constant, distance scale, cosmological constant, early Universe, etc)
© EPLA, 2011
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