Parametrizing the transition to the phantom epoch with supernovae Ia and standard rulers

Leanizbarrutia, Iker; Sáez-Gómez, Diego

Parametrizing the transition to the phantom epoch with supernovae Ia and standard rulers

Journal Article

2014

Journal Title

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

Link to Journal

https://dx.doi.org/10.1103/PhysRevD.90.063508

Department

Department of Mathematics and Applied Mathematics

Faculty

Faculty of Science

Abstract

The properties of some particular parametrizations of the dark energy Equation of State (EoS) are studied by using Supernovae Ia data (HST Cluster Supernova Survey) combined with Standard Ruler datasets (Cosmic Microwave Background (CMB) and Baryon Acoustic Oscillations (BAO)). In this sense, we propose some parametrizations that may present a (fast) transition to a phantom dark energy EoS (where $w_{DE}<-1$) and compare the results with the $Lambda$CDM model. The best fit of the models is obtained by using Sne Ia and Standard Ruler datasets, which provides some information about whether the phantom transition may be supported by the observations. In this regard, the crossing of the phantom barrier is allowed statistically but the occurrence of a future singularity seems unlikely. Furthermore, the reconstruction of a (non-)canonical scalar field Lagrangian from the EoS parameter is studied, where shown that EoS parametrizations can be well reconstructed in terms of scalar fields.

Keywords

Astrophysics - Cosmology and Nongalactic Astrophysics

General Relativity and Quantum Cosmology

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