Linear and nonlinear instabilities in unified dark energy models

• Type: Article in International Scientific Journal
• Date: 2008

Authors

Avelino, PP (Author) FCUP; Beca, LMG (Author) Other; Martins, CJAP (Author) FCUP

Journal

Title: Physical Review D - Particles, Fields, Gravitation and Cosmology

Vol. 77

ISSN: 1550-7998

Publisher: American Physical Society

Indexing

ISI Web of Knowledge - 29 Citations

Scopus - 30 Citations

Other information

Authenticus ID: P-004-1BF

DOI: 10.1103/physrevd.77.063515

Abstract (EN): We revisit the paradigm of unified dark energy discussing in detail the averaging problem in this type of scenario, highlighting the need for a full nonlinear treatment. We also address the question of if and how models with one or several dark fluids can be observationally distinguished. Simpler and physically clearer derivations of some key results, most notably on the relation between the generalized Chaplygin gas and the standard (Lambda CDM) "concordance'' model and on a Jeans-type small-scale instability of some coupled dark energy/dark matter models are presented.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6