Results 81 to 90 of about 3,373,254 (352)
Investigation of circular geodesics in a rotating charged black hole in the presence of perfect fluid dark matter [PDF]
Classical and quantum gravity, 2020 In this work we have obtained a charged black hole solution in the presence of perfect fluid dark matter (PFDM) and discuss its energy conditions. The metric corresponding to the rotating avatar of this black hole solution is obtained by incorporating ...
Anish Das +2 more
semanticscholar +1 more source
Dark energy interacting with two fluids
Physics Letters B, 2008 A cosmological model of dark energy interacting with dark matter and another general component of the universe is investigated. We found general constraints on these models imposing an accelerated expansion. The same is also studied in the case for holographic dark energy.
Francisco Peña +2 more
openaire +3 more sources
VISCOUS DARK FLUID UNIVERSE: A UNIFIED MODEL OF THE DARK SECTOR? [PDF]
International Journal of Modern Physics: Conference Series, 2011 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 homogeneous and isotropic background the total energy density of this mixture behaves as a generalized Chaplygin gas.
Winfried Zimdahl +2 more
openaire +4 more sources
Dark matter fluid constraints from galaxy rotation curves
European Physical Journal C: Particles and Fields, 2023 Galaxy rotation curves are considered to be convincing evidence for dark matter or some dynamically equivalent alternative mechanism. Starting only from the rotation curve data, we present a model independent approach of testing a general hypothesis that
Dalibor Perković, Hrvoje Štefančić
doaj +1 more source
Dark energy and dark matter from an additional adiabatic fluid [PDF]
Physical Review D, 2016 The Dark Sector is described by an additional barotropic fluid which evolves adiabatically during the universe's history and whose adiabatic exponent $ $ is derived from the standard definitions of specific heats. Although in general $ $ is a function of the redshift, the Hubble parameter and its derivatives, we find that our assumptions lead ...
Peter K. S. Dunsby +2 more
openaire +3 more sources
Network topology drives population temporal variability in experimental habitat networks
Population Ecology, EarlyView.Habitat patches connected by dispersal pathways form habitat networks. We explored how network topology affects population outcomes in laboratory experiments using a model species (Daphnia carinata). Central habitat nodes in complex lattice networks exhibited lower temporal variability in population sizes, suggesting they support more stable ...
Yiwen Xu +3 more
wiley +1 more source
Affine equation of state from quintessence and k-essence fields [PDF]
, 2007 We explore the possibility that a scalar field with appropriate Lagrangian can mimic a perfect fluid with an affine barotropic equation of state. The latter can be thought of as a generic cosmological dark component evolving as an effective cosmological ...
Amedeo Balbi +14 more
core +2 more sources
Fluids of Vortices And Dark Matter
, 2000 REVTeX, 9 PostScript figures with ...
Bonjour, Filipe, Letelier, P. S.
openaire +3 more sources
Dark energy coupled with dark matter in viscous fluid cosmology [PDF]
Astrophysics and Space Science, 2014 6 pages, no figures; to appear in Astrophys.
V. V. Obukhov +2 more
openaire +3 more sources
Anisotropic fluid cosmology: An alternative to dark matter? [PDF]
Physical Review D, 2020 We use anisotropic fluid cosmology to describe the present, dark energy-dominated, universe. Similarly to what has been proposed for galactic dynamics, the anisotropic fluid gives an effective description of baryonic matter, dark energy and their possible interaction, without assuming the presence of dark matter.
Cadoni M., Sanna A. P., Tuveri M.
openaire +3 more sources