Observational constraints on the unified dark matter and dark energy model based on the quark bag model

Ariadna Montiel; Vincenzo Salzano; Ruth Lazkoz

doi:10.1016/j.physletb.2014.04.048

paper

Observational constraints on the unified dark matter and dark energy model based on the quark bag model

arXiv:1404.0388 · doi:10.1016/j.physletb.2014.04.048

Abstract

In this work we investigate if a small fraction of quarks and gluons, which escaped hadronization and survived as a uniformly spread perfect fluid, can play the role of both dark matter and dark energy. This fluid, as developed in \citep{Brilenkov}, is characterized by two main parameters: $β$ , related to the amount of quarks and gluons which act as dark matter; and $γ$ , acting as the cosmological constant. We explore the feasibility of this model at cosmological scales using data from type Ia Supernovae (SNeIa), Long Gamma-Ray Bursts (LGRB) and direct observational Hubble data. We find that: (i) in general, $β$ cannot be constrained by SNeIa data nor by LGRB or H(z) data; (ii) $γ$ can be constrained quite well by all three data sets, contributing with $\approx 78%$ to the energy-matter content; (iii) when a strong prior on (only) baryonic matter is assumed, the two parameters of the model are constrained successfully.

10 pages, 6 figures, 3 tables

Observational constraints on the unified dark matter and dark energy model based on the quark bag model

Abstract

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