Observational constraints on a unified dark matter and dark energy model based on generalized Chaplygin gas

Journal Article · Mon Mar 15 04:00:00 EDT 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.81.063532· OSTI ID:21413414

Park, Chan-Gyung; Hwang, Jai-chan; Park, Jaehong ^[1]; Noh, Hyerim ^[2]

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1. Department of Astronomy and Atmospheric Sciences, Kyungpook National University, Taegu (Korea, Republic of)
2. Korea Astronomy and Space Science Institute, Daejon (Korea, Republic of)

We study a generalized version of Chaplygin gas as unified model of dark matter and dark energy. Using realistic theoretical models and the currently available observational data from the age of the universe, the expansion history based on the type Ia supernovae, the matter power spectrum, the cosmic microwave background radiation anisotropy power spectra, and the perturbation growth factor we put the unified model under observational test. As the model has only two free parameters in the flat Friedmann background [{Lambda}CDM (cold dark matter) model has only one free parameter] we show that the model is already tightly constrained by currently available observations. The only parameter space extremely close to the {Lambda}CDM model is allowed in this unified model.

• OSTI ID: 21413414
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 6 Vol. 81; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ANISOTROPY
BINARY STARS
COMPUTERIZED SIMULATION
DISTURBANCES
ELECTROMAGNETIC RADIATION
ERUPTIVE VARIABLE STARS
EXPANSION
GROWTH FACTORS
MATHEMATICAL MODELS
MATTER
MICROWAVE RADIATION
MITOGENS
NONLUMINOUS MATTER
NUCLEAR MODELS
ORGANIC COMPOUNDS
PERTURBATION THEORY
PROTEINS
RADIATIONS
RELICT RADIATION
SIMULATION
SPACE
SPECTRA
STARS
SUPERNOVAE
UNIFIED MODEL
UNIVERSE
VARIABLE STARS