Phenomenology of Unified Dark Matter models with fast transition

Abstract

A fast transition between a standard matter-like era and a late $\Lambda$CDM-like epoch generated by a single Unified Dark Matter component can explain the observed acceleration of the Universe. UDM models with a fast transition should be clearly distinguishable from $\Lambda$CDM (and alternatives) through observations. Here we focus on a particularly simple model and analyse its viability by studying features of the background model and properties of the adiabatic UDM perturbations.

4 pages, 1 figure, Proceedings of the Spanish Relativity Meeting ERE2012, University of Minho, Guimarães, Portugal, September 3-7, 2012

References in corpus (3)

• Unified Dark Matter Scalar Field Models
• ISW effect in Unified Dark Matter Scalar Field Cosmologies: an analytical approach
• Affine parameterization of the dark sector: costraints from WMAP5 and SDSS