W
Winfried Zimdahl
Researcher at Universidade Federal do Espírito Santo
Publications - 160
Citations - 6453
Winfried Zimdahl is an academic researcher from Universidade Federal do Espírito Santo. The author has contributed to research in topics: Dark energy & Dark matter. The author has an hindex of 41, co-authored 159 publications receiving 6030 citations. Previous affiliations of Winfried Zimdahl include University of Düsseldorf & University of Cologne.
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Interacting Quintessence
TL;DR: In this article, a suitable coupling between a quintessence scalar field and a pressureless cold dark matter (CDM) fluid leads to a constant ratio of the energy densities of both components which is compatible with an accelerated expansion of the universe.
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Holographic dark energy and cosmic coincidence
Diego Pavón,Winfried Zimdahl +1 more
TL;DR: In this paper, it was shown that any interaction of pressureless dark matter with holographic dark energy, whose infrared cutoff is set by the Hubble scale, implies a constant ratio of the energy densities of both components thus solving the coincidence problem.
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Interacting quintessence solution to the coincidence problem
TL;DR: In this paper, the authors show that a suitable interaction between a scalar field and a matter fluid in a spatially homogeneous and isotropic spacetime can drive the transition from a matter dominated era to an accelerated expansion phase and simultaneously solve the coincidence problem of our present Universe.
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Cosmic antifriction and accelerated expansion
TL;DR: In this article, a phenomenological one-component model of cold dark matter with internal self-interactions is proposed to explain an accelerated expansion of the present universe, suggested from observations of supernovae of type la at high redshift, by introducing an antifrictional force that is selfconsistently exerted on the particles of the cosmic substratum.
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Bulk viscous cosmology.
TL;DR: A scenario in which the dark components of the Universe are manifestations of a single bulk viscous fluid, which is competitive in comparison with the currently most popular proposals for the description of the cosmological dark sector.