| Issue |
EPL
Volume 94, Number 4, May 2011
|
|
|---|---|---|
| Article Number | 49002 | |
| Number of page(s) | 6 | |
| Section | Geophysics, Astronomy and Astrophysics | |
| DOI | https://doi.org/10.1209/0295-5075/94/49002 | |
| Published online | 04 May 2011 | |
Dark energy from a scale-free distribution
1
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
a
orlando.luongo@roma1.infn.it
Received:
4
March
2011
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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