301 citations · 2.1k across the 77 of their papers we have counts for
7 papers · 1 filter
Neo-newtonian theories
J. C. Fabris, H. Velten
General Relativity is the modern theory of gravitation. It has replaced the newtonian theory in the description of the gravitational phenomena. In spite of the remarkable success o…
Structure formation in a CDM universe
Hermano Velten, Thiago R. P. Caramês, Júlio C. Fabris +2
The possibility of dark matter being a dissipative component represents an option for the standard view where cold dark matter (CDM) particles behave on large scales as an ideal fl…
Aspects of the cosmological "coincidence problem"
H. E. S. Velten, R. F. vom Marttens, W. Zimdahl
The observational fact that the present values of the densities of dark energy and dark matter are of the same order of magnitude, , seems to i…
Newtonian View of General Relativistic Stars
A. M. Oliveira, H. E. S. Velten, J. C. Fabris +1
Although general relativistic cosmological solutions, even in the presence of pressure, can be mimicked by using neo-Newtonian hydrodynamics, it is not clear whether there exists t…
Non-linear dark matter collapse under diffusion
Hermano E. S. Velten, Thiago R. P. Caramês
Diffusion is one of the physical processes allowed for describing the large scale dark matter dynamics. At the same time, it can be seen as a possible mechanism behind the interact…
Exploring non-linear cosmological matter diffusion coefficients
Hermano Velten, Simone Calogero
Since microscopic velocity diffusion can be incorporated into general relativity in a consistent way, we study cosmological background solutions when the diffusion phenomena takes…
Spherical collapse for unified dark matter models
Thiago R. P. Caramês, Júlio C. Fabris, Hermano E. S. Velten
We study the non-linear spherical "top hat" collapse for Chaplygin and viscous unified cosmologies. The term unified refers to models where dark energy and dark matter are replaced…