301 citations · 2.1k across the 77 of their papers we have counts for
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Unified models of the cosmological dark sector
W Zimdahl, W S Hipólito-Ricaldi, H E S Velten
We model the cosmological substratum by a viscous fluid that is supposed to provide a unified description of the dark sector and pressureless baryonic matter. In the homogeneous an…
Ruling out the Modified Chaplygin Gas Cosmologies
J. C. Fabris, C. Ogouyandjou, J. Tossa +1
The Modified Chaplygin Gas (MCG) model belongs to the class of a unified models of dark energy (DE) and dark matter (DM). It is characterized by an equation of state (EoS) $p_c = B…
Viscous dark fluid universe
W. S. Hipólito-Ricaldi, H. E. S. Velten, W. Zimdahl
We investigate the cosmological perturbation dynamics for a universe consisting of pressureless baryonic matter and a viscous fluid, the latter representing a unified model of the…
Constraints on the Generalized Chaplygin Gas Model from Gamma-Ray Bursts
R. C. Freitas, S. V. B. Gonçalves, H. E. S. Velten
We study the Generalized Chaplygin gas model (GCGM) using Gamma-ray bursts as cosmological probes. In order to avoid the so-called circularity problem we use cosmology-independent…
Matter power spectrum for the generalized Chaplygin gas model: The relativistic case
J. C. Fabris, H. E. S. Velten, W. Zimdahl
The generalized Chaplygin gas (GCG) model is the prototype of a unified model of dark energy (DE) and dark matter (DM). It is characterized by equation-of-state (EoS) parameters $A…