Is the cosmological dark sector better modeled by a generalized Chaplygin gas or by a scalar field?

Sergio del Campo, Júlio C. Fabris, RAMON ALEJANDRO HERRERA APABLAZA, Winfried Zimdahl

Research output: Contribution to journalArticlepeer-review

Abstract

Both scalar fields and (generalized) Chaplygin gases have been widely used separately to characterize the dark sector of the universe. Here we investigate the cosmological background dynamics for a mixture of both these components and quantify the fractional abundances that are admitted by observational data from supernovae of type Ia and from the evolution of the Hubble rate. Moreover, we study how the growth rate of (baryonic) matter perturbations is affected by the dark-sector perturbations.

Original languageEnglish
Article number479
JournalEuropean Physical Journal C
Volume77
Issue number7
DOIs
StatePublished - 1 Jul 2017

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