Scaling cosmology with variable dark-energy equation of state

Abstract

Interactions between dark matter and dark energy which result in a power-law behavior (with respect to the cosmic scale factor) of the ratio between the energy densities of the dark components (thus generalizing the LCDM model) have been considered as an attempt to alleviate the cosmic coincidence problem phenomenologically. We generalize this approach by allowing for a variable equation of state for the dark energy within the CPL-parametrization. Based on analytic solutions for the Hubble rate and using the Constitution and Union2 SNIa sets, we present a statistical analysis and classify different interacting and non-interacting models according to the Akaike (AIC) and the Bayesian (BIC) information criteria. We do not find noticeable evidence for an alleviation of the coincidence problem with the mentioned type of interaction.

21 pages, 11 figures, 11 tables, discussion improved

References in corpus (8)

• Spectra and Light Curves of Six Type Ia Supernovae at 0.511 < z < 1.12 and the Union2 Compilation
• Improved Dark Energy Constraints from ~100 New CfA Supernova Type Ia Light Curves
• Observational constraints on Galileon cosmology
• Examining the cosmic acceleration with the latest Union2 supernova data
• Hubble parameter data constraints on dark energy
• Detecting the cosmic acceleration with current data
• Dark Energy Cosmology with the Alternative Cosmic Microwave Background Data
• Round Table Discussion at the Workshop "New Directions in Modern Cosmology"

Cited by in corpus (8)

• AIC and BIC for cosmological interacting scenarios
• Cosmology with matter diffusion
• CMB and matter power spectra with non-linear dark-sector interactions
• The late Universe with non-linear interaction in the dark sector: the coincidence problem
• Electrodynamics of a Cosmic Dark Fluid
• Matter Perturbations in Scaling Cosmology
• Non-linear dark matter collapse under diffusion
• Degeneracy between warm and coupled cold dark matter: A clarifying note