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A Viable Dark Fluid Model [PDF]
Astrophysics and Space Science, 2023 We Consider a cosmological model based on a generalization of the equation of state proposed by Nojiri and Odintsov [46] and \v{S}tefan\v{c}i'c [47], [48].
Elkhateeb, Esraa
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Viscous dark fluid universe [PDF]
Physical Review D, 2010 We investigate the cosmological perturbation dynamics for a universe consisting of pressureless baryonic matter and a viscous fluid, the latter representing a unified model of the dark sector. In the homogeneous and isotropic background the \textit{total}
A. Avelino +4 more
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Constraining the dark fluid [PDF]
Physical Review D, 2009 Cosmological observations are normally fit under the assumption that the dark sector can be decomposed into dark matter and dark energy components.
Gao, Changjun +3 more
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Barotropic fluid compatible parametrizations of dark energy
European Physical Journal C: Particles and Fields, 2020 Parametrizations of equation of state parameter as a function of the scale factor or redshift are frequently used in dark energy modeling. The question investigated in this paper is if parametrizations proposed in the literature are compatible with the ...
Dalibor Perković, Hrvoje Štefančić
doaj +3 more sources
Dark Viscous Fluid coupled with Dark Matter and future singularity [PDF]
The European Physical Journal C, 2010 We study effects of viscous fluid coupled with dark matter in our universe. We consider bulk viscosity in the cosmic fluid and we suppose the existence of a coupling between fluid and dark matter, in order to reproduce a stable de Sitter universe ...
A.G. Riess +23 more
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Dark radiation from a unified dark fluid model [PDF]
Progress of Theoretical and Experimental Physics, 2014 We present a unified dark fluid model to describe the possible evolutionary behavior of $\Delta N_\mathrm{eff}$ in dark radiation. This model can be viewed as an interacting model for the dark sectors, in which dark matter interacts with dark radiation ...
Geng, Chao-Qiang +2 more
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Darkness without dark matter and energy – generalized unimodular gravity [PDF]
Physics Letters B, 2017 We suggest a Lorentz non-invariant generalization of the unimodular gravity theory, which is classically equivalent to general relativity with a locally inert (devoid of local degrees of freedom) perfect fluid having an equation of state with a constant ...
A.O. Barvinsky, A.Yu. Kamenshchik
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Covariant generalized holographic dark energy and accelerating universe [PDF]
European Physical Journal C: Particles and Fields, 2017 We propose the generalized holographic dark energy model where the infrared cutoff is identified with the combination of the FRW universe parameters: the Hubble rate, particle and future horizons, cosmological constant, the universe lifetime (if finite ...
Shin’ichi Nojiri, S. D. Odintsov
doaj +4 more sources
Electrodynamics of a Cosmic Dark Fluid [PDF]
Symmetry, 2016 Cosmic Dark Fluid is considered as a non-stationary medium, in which electromagnetic waves propagate, and magneto-electric field structures emerge and evolve.
Balakin, Alexander B.
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Modeling holographic dark energy with particle and future horizons
Nuclear Physics B, 2020 In this work we explore some cosmological properties coming from the particle and future horizons when are considered as candidates to model the dark energy sector within a holographic context in a flat Friedmann-Lemaitre-Robertson-Walker universe; we ...
Miguel Cruz, Samuel Lepe
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