Alternatives to quintessence model building

• Type: Article in International Scientific Journal
• Date: 2003

Authors

Avelino, PP (Author) FCUP; Beca, LMG (Author) Other; de Carvalho, JPM (Author) FCUP; Martins, CJAP (Author) Other; Pinto, P (Author) Other

Journal

Title: Physical Review D: Particles and fields

Vol. 67

ISSN: 0556-2821

Publisher: American Physical Society

Indexing

ISI Web of Knowledge - 62 Citations

Scopus - 91 Citations

Scientific classification

FOS: Natural sciences > Physical sciences

Other information

Authenticus ID: P-000-J18

DOI: 10.1103/physrevd.67.023511

Abstract (EN): We discuss the issue of toy model building for the dark energy component of the universe. Specifically, we consider two generic toy models recently proposed as alternatives to quintessence models, respectively known as Cardassian expansion and the Chaplygin gas. We show that the former is entirely equivalent to a class of quintessence models. We determine the observational constraints on the latter, coming from recent supernovae results and from the shape of the matter power spectrum. As expected, these restrict the model to a behavior that closely matches that of a standard cosmological constant Lambda.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8