Chaplygin gas halos

de Beer, T.; van Holten, J. W.

doi:10.48550/arxiv.1712.02129

Cited by 1 publication

(1 citation statement)

References 28 publications

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“…Also, they can elevate the cosmic coincidence problem that appears in the relatively constant ratio of relic density of cosmological constant and matter content of the universe [27]. These models can explain the formation of large structures in the universe and the halo of DM in galaxies [28,29]. Even if the origin of DM and DE are different, such models can be used as a simplified model to study all matter content of the universe as a single fluid illustrating the cosmic evolution [30].…”

Section: Introductionmentioning

confidence: 99%

On the viability of Planck scale cosmology with quartessence

Khodadi

Hajkarim²

2018

Eur. Phys. J. C

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Growing evidence as the observations of the CMB (cosmic microwave background), galaxy clustering and high-redshift supernovae address a stable dynamically universe dominated by the dark components. In this paper, using a qualitative theory of dynamical systems, we study the stability of a unified dark matter-dark energy framework known as quartessence Chaplygin model (QCM) with three different equation-of-states within ultraviolet (UV) deformed Friedmann-Robertson-Walker (FRW) cosmologies without Big-Bang singularity. The UV deformation is inspired by the noncommutative (NC) Snyder spacetime approach in which by keeping the transformation groups and rotational symmetry there is a dimensionless, Planck scale characteristic parameter µ0 with dual implications dependent on its sign that addresses the required invariant cutoffs for length and momentum in nature, in a separate manner. Our stability analysis is done in the (H, ρ) phase space at a finite domain concerning the hyperbolic critical points. According to our analysis, due to constraints imposed on the signs of µ0 from the phenomenological parameters involved in quartessence models (Ω * m , c 2 s , ρ * ), for an expanding and accelerating late universe, all three QCMs can be stable in the vicinity of the critical points. The requirement of stability for these quartessence models in case of admission of a minimum invariant length, can yield a flat as well as non-flat expanding and accelerating universe in which Big-Bang singularity is absent. This feedback also phenomenologically credits to braneworld-like framework versus loop quantum cosmology-like one as two possible scenarios which can be NC Snyder spacetime generators (correspond to µ0 < 0 and µ0 > 0, respectively). As a result, our analysis show that between quartessence models with Chaplygin gas equation-of-states and accelerating FRW backgrounds occupied by a minimum invariant length, there is a possibility of viability.

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Section: Introductionmentioning

confidence: 99%