301 citations · 2.1k across the 77 of their papers we have counts for
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Viscous dark fluid Universe: a unified model of the dark sector?
W. Zimdahl, H. E. S. Velten, W. S. Hipólito-Ricaldi
The Universe is modeled as consisting of pressureless baryonic matter and a bulk viscous fluid which is supposed to represent a unified description of the dark sector. In the homog…
Observational constraints of the gravitational waves in the Brans-Dicke theory: Einstein frame and Jordan-Brans-Dicke frame
R. C. Freitas, S. V. B. Gonçalves
We investigate the quantum origin of the primordial cosmological gravitational waves in the Brans-Dicke theory in the two conformally related frames, the Jordan-Brans-Dicke frame a…
Power spectrum for the Bose-Einstein condensate dark matter
Hermano Velten, Etienne Wamba
We assume that dark matter is composed of scalar particles that form a Bose-Einstein condensate (BEC) at some point during the cosmic evolution. Afterwards, cold dark matter is in…
Constraints on dissipative unified dark matter
Hermano Velten, Dominik J. Schwarz
Modern cosmology suggests that the Universe contains two dark components -- dark matter and dark energy -- both unkown in laboratory physics and both lacking direct evidence. Alter…
Contraints on unified models for dark matter and dark energy using H(z)
J. C. Fabris, P. L. C. de Oliveira, H. E. S. Velten
The differential age data of astrophysical objects that have evolved passivelly during the history of the universe (e.g. red galaxies) allows to test theoretical cosmological model…