301 citations · 2.1k across the 77 of their papers we have counts for
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Cosmology with matter diffusion
Simone Calogero, Hermano Velten
We construct a viable cosmological model based on velocity diffusion of matter particles. In order to ensure the conservation of the total energy-momentum tensor in the presence of…
A note on acoustic black holes in neo-Newtonian theory
J. C. Fabris, O. F. Piattella, I. G. Salako +2
Newtonian fluid dynamics allows the construction of acoustic metrics from which black hole configurations can be studied. However, relativistic pressure effects are neglected withi…
Viscous dark matter growth in (neo-)Newtonian cosmology
H. Velten, D. J. Schwarz, J. C. Fabris +1
We assume cold dark matter to possess a small bulk-viscous pressure which typically attenuates the growth of inhomogeneities. Explicit calculations, based on Eckart's theory of dis…
Phantom dark energy as an effect of bulk viscosity
Hermano Velten, Jiaxin Wang, Xinhe Meng
In a homogeneous and isotropic universe bulk viscosity is the unique viscous effect capable to modify the background dynamics. Effects like shear viscosity or heat conduction can o…
Viscous Cold Dark Matter in agreement with observations
Hermano Velten
We discuss bulk viscous cosmological models. Since the bulk viscous pressure is negative, viable viscous cosmological scenarios with late time accelerated expansion can in principl…