Clustering properties of dynamical 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 - 21 Citations

Scopus - 22 Citations

Other information

Authenticus ID: P-003-ZX4

DOI: 10.1103/physrevd.77.101302

Abstract (EN): We provide a generic but physically clear discussion of the clustering properties of dark energy models. We explicitly show that in quintessence-type models the dark energy fluctuations, on scales smaller than the Hubble radius, are of the order of the perturbations to the Newtonian gravitational potential, hence necessarily small on cosmological scales. Moreover, comparable fluctuations are associated with different gauge choices. We also demonstrate that the often used homogeneous approximation is unrealistic, and that the so-called dark energy mutation is a trivial artifact of an effective, single fluid description. Finally, we discuss the particular case where the dark energy fluid is nonminimally coupled to dark matter.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 5