Observational constraints on the unified dark matter and dark energy model based on the quark bag model
Ariadna Montiel (Departamento de Física, Centro de Investigación y de Estudios Avanzados del IPN, Apartado Postal 14-740, México, DF, 07000, Mexico); Vincenzo Salzano (Departamento de Física Teórica e Historia de la Ciencia, Universidad del País Vasco (UPV/EHU), Apdo. 644, Bilbao, E-48080, Spain); Ruth Lazkoz (Departamento de Física Teórica e Historia de la Ciencia, Universidad del País Vasco (UPV/EHU), Apdo. 644, Bilbao, E-48080, Spain)
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 [1] , 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 ≈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.
