Quantisation of the holographic Ricci dark energy model

Albarran, Imanol; Bouhmadi-López, Mariam

doi:10.1088/1475-7516/2015/08/051

Cited by 14 publications

(14 citation statements)

References 79 publications

(149 reference statements)

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“…The classical singular asymptotic behaviour of these dark energy models has led to a quantum cosmological analysis of these setups [39][40][41][42]95]. In these works, it was concluded that once the Universe enters in a genuinely quantum phase; i.e., where coherence and entanglement effects are important, the Universe would evade a doomsdayà la rip.…”

Section: Introductionmentioning

confidence: 99%

Cosmological perturbations in an effective and genuinely phantom dark energy Universe

Albarran

Bouhmadi-López

Morais

2017

Physics of the Dark Universe

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We carry out an analysis of the cosmological perturbations in general relativity for three different models which are good candidates to describe the current acceleration of the Universe. These three set-ups are described classically by perfect fluids with a phantom nature and represent deviations from the most widely accepted ΛCDM model. In addition, each of the models under study induce different future singularities or abrupt events known as (i) Big Rip, (ii) Little Rip and (iii) Little Sibling of the Big Rip. Only the first one is regarded as a true singularity since it occurs at a finite cosmic time. For this reason, we refer to the others as abrupt events. With the aim to find possible footprints of this scenario in the Universe matter distribution, we not only obtain the evolution of the cosmological scalar perturbations but also calculate the matter power spectrum for each model. We have carried the perturbations in the absence of any anisotropic stress and within a phenomenological approach for the speed of sound. We constrain observationally these models using several measurements of the growth rate function, more precisely f σ8, and compare our results with the observational ones.

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Section: Introductionmentioning

confidence: 99%

Cosmological perturbations in an effective and genuinely phantom dark energy Universe

Albarran

Bouhmadi-López

Morais

2017

Physics of the Dark Universe

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“…However, as energy density diverges in all the cases presented, one might expect that quantum effects become important at some point in the future evolution. In fact, a quantum analysis shows that in all cases, the classical abrupt event can be avoided from a quantum point of view [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Cosmological Perturbations in Phantom Dark Energy Models

2017

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Abstract:The ΛCDM paradigm, characterised by a constant equation of state w = −1 for dark energy, is the model that better fits observations. However, the same observations strongly support the possibility of a dark energy content where the corresponding equation of state is close to but slightly smaller than −1. In this regard, we focus on three different models where the dark energy content is described by a perfect fluid with an equation of state w −1 which can evolve or not. The three proposals show very similar behaviour at present, while the asymptotic evolution of each model drives the Universe to different abrupt events known as (i) Big Rip; (ii) Little Rip (LR); and (iii) Little Sibling of the Big Rip. With the aim of comparing these models and finding possible imprints in their predicted matter distribution, we compute the matter power spectrum and the growth rate f σ 8 . We conclude that the model which induces a LR seems to be favoured by observations.

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“…For a FLRW universe, this singularity is usually present in a universe which is spatially closed and filled with matter satisfying the strong energy conditions (but see [54] for a counterexample). Type I A big rip singularity takes place at finite cosmic time with infinite scale factor, where the Hubble parameter and its cosmic time derivative diverge [55,56,37,30,57,58,59,60,2,61]. The occurrence of this singularity is intrinsic to phantom dark energy.…”

Section: Cosmic Curvature Singularities (At a Finite Time): Gr And Bementioning

confidence: 99%

Phantom singularities and their quantum fate: general relativity and beyond—a CANTATA COST action topic

2019

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Cosmological observations allow the possibility that dark energy is caused by phantom fields. These fields typically lead to the occurrence of singularities in the late Universe. We review here the status of phantom singularities and their possible avoidance in a quantum theory of gravity. We first introduce phantom energy and discuss its behavior in cosmology. We then list the various types of singularities that can occur from its presence. We also discuss the possibility that phantom behavior is mimicked by an alternative theory of gravity. We finally address the quantum cosmology of these models and discuss in which sense the phantom singularities can be avoided.

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Quantisation of the holographic Ricci dark energy model

Cited by 14 publications

References 79 publications

Cosmological perturbations in an effective and genuinely phantom dark energy Universe

Cosmological perturbations in an effective and genuinely phantom dark energy Universe

Cosmological Perturbations in Phantom Dark Energy Models

Phantom singularities and their quantum fate: general relativity and beyond—a CANTATA COST action topic

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