671 citations · 4.8k across the 83 of their papers we have counts for
84 papers
On the mode structure of imperfect fluids
Winfried Zimdahl
This paper tries to obtain a simple picture of several aspects of the mode structure in relativistic non-equilibrium thermodynamics. Its pedagogical focus is on the relation betwee…
Early-time thermalization of cosmic components? A hint for solving cosmic tensions
Hermano Velten, Ingrid Costa, Winfried Zimdahl
We study an expanding two-fluid model of non-relativistic dark matter and radiation which are allowed to interact during a certain time span and to establish an approximate thermal…
On (non-)dynamical dark energy
Winfried Zimdahl, Júlio Fabris, Hermano Velten +1
The current Universe is composed by a mixture of relativistic species, baryonic matter, dark matter and dark energy which evolve in a non-trivial way at perturbative level. An adva…
Matter Growth in Imperfect Fluid Cosmology
Winfried Zimdahl, Hermano Velten, William C. Algoner
Extensions of Einstein's General Relativity (GR) can formally be given a GR structure in which additional geometric degrees of freedom are mapped on an effective energy-momentum te…
Is the cosmological dark sector better modeled by a generalized Chaplygin gas or by a scalar field?
S. del Campo, J. C. Fabris, R. Herrera +1
Both scalar fields and (generalized) Chaplygin gases have been widely used separately to characterize the dark sector of the Universe. Here we investigate the cosmological backgrou…
Does a generalized Chaplygin gas correctly describe the cosmological dark sector?
R. F. vom Marttens, L. Casarini, W. Zimdahl +2
Yes, but only for a parameter value that makes it almost coincide with the standard model. We reconsider the cosmological dynamics of a generalized Chaplygin gas (gCg) which is spl…