Observational constraints on dark energy with a fast varying equation of state
Abstract
We place observational constraints on models with the late-time cosmic acceleration based on a number of parametrizations allowing fast transitions for the equation of state of dark energy. In addition to the model of Linder and Huterer where the dark energy equation of state w monotonically grows or decreases in time, we propose two new parametrizations in which w has an extremum. We carry out the likelihood analysis with the three parametrizations by using the observational data of supernovae type Ia, cosmic microwave background, and baryon acoustic oscillations. Although the transient cosmic acceleration models with fast transitions can give rise to the total chi square smaller than that in the Λ-Cold-Dark-Matter (ΛCDM) model, these models are not favored over ΛCDM when one uses the Akaike information criterion which penalizes the extra degrees of freedom present in the parametrizations.
- Authors:
-
- ThEP's CRL, NEP, The Institute for Fundamental Study, Naresuan University, Phitsanulok 65000 (Thailand)
- Departamento de Fisica Teorica and Instituto de Fisica Teorica UAM/CSIC, Universidad Autonoma de Madrid, Cantoblanco, E-28049 Madrid (Spain)
- Department of Physics, Faculty of Science, Tokyo University of Science, 1-3, Kagurazaka, Shinjuku-ku, Tokyo 162-8601 (Japan)
- Publication Date:
- OSTI Identifier:
- 22279984
- Resource Type:
- Journal Article
- Journal Name:
- Journal of Cosmology and Astroparticle Physics
- Additional Journal Information:
- Journal Volume: 2012; Journal Issue: 05; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCELERATION; BARYONS; COSMOLOGICAL CONSTANT; COSMOLOGY; DEGREES OF FREEDOM; EQUATIONS OF STATE; INFLATIONARY UNIVERSE; NONLUMINOUS MATTER; OSCILLATIONS; RELICT RADIATION; SUPERNOVAE; TRANSIENTS
Citation Formats
Felice, Antonio De, Nesseris, Savvas, and Tsujikawa, Shinji. Observational constraints on dark energy with a fast varying equation of state. United States: N. p., 2012.
Web. doi:10.1088/1475-7516/2012/05/029.
Felice, Antonio De, Nesseris, Savvas, & Tsujikawa, Shinji. Observational constraints on dark energy with a fast varying equation of state. United States. https://doi.org/10.1088/1475-7516/2012/05/029
Felice, Antonio De, Nesseris, Savvas, and Tsujikawa, Shinji. 2012.
"Observational constraints on dark energy with a fast varying equation of state". United States. https://doi.org/10.1088/1475-7516/2012/05/029.
@article{osti_22279984,
title = {Observational constraints on dark energy with a fast varying equation of state},
author = {Felice, Antonio De and Nesseris, Savvas and Tsujikawa, Shinji},
abstractNote = {We place observational constraints on models with the late-time cosmic acceleration based on a number of parametrizations allowing fast transitions for the equation of state of dark energy. In addition to the model of Linder and Huterer where the dark energy equation of state w monotonically grows or decreases in time, we propose two new parametrizations in which w has an extremum. We carry out the likelihood analysis with the three parametrizations by using the observational data of supernovae type Ia, cosmic microwave background, and baryon acoustic oscillations. Although the transient cosmic acceleration models with fast transitions can give rise to the total chi square smaller than that in the Λ-Cold-Dark-Matter (ΛCDM) model, these models are not favored over ΛCDM when one uses the Akaike information criterion which penalizes the extra degrees of freedom present in the parametrizations.},
doi = {10.1088/1475-7516/2012/05/029},
url = {https://www.osti.gov/biblio/22279984},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 05,
volume = 2012,
place = {United States},
year = {Tue May 01 00:00:00 EDT 2012},
month = {Tue May 01 00:00:00 EDT 2012}
}