Could the cosmic acceleration be transient? A cosmographic evaluation

Guimarães, Antonio C. C.; Lima, J. A. S.

doi:10.1088/0264-9381/28/12/125026

Cited by 60 publications

(45 citation statements)

References 50 publications

(82 reference statements)

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“…Those results are compatible with the ΛCDM paradigm [109][110][111][112][113][114][115][116] and correspond to a barotropic factor inside the interval: = −1.0820…”

Section: Late-time Evolutionsupporting

confidence: 83%

A Thermodynamic Approach to Holographic Dark Energy

Luongo

2017

Advances in High Energy Physics

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We propose a method to relate the holographic minimal information density to de Broglie's wavelength at a given universe temperature . To figure this out, we assume that the thermal length of massive and massless constituents represents the cutoff scale of the holographic principle. To perform our analysis, we suppose two plausible universe volumes, that is, the adiabatic and the horizon volumes, that is, ∝ 3 and ∝ −3 , respectively, assuming zero spatial curvature. With these choices in mind, we evaluate the thermal lengths for massive and massless particles and we thus find two cosmological models associated with late and early cosmological epochs. We demonstrate that both models depend upon a free term which enters the temperature parametrization in terms of the redshift . For the two treatments, we show evolving dark energy terms which can be compared with the CDM quintessence paradigm when the barotropic factor takes the formal values 0 = −(1/3)(2 + ) and 0 = −(1/3)(1 + 2 ), respectively, for late and early eras. From our analyses, we nominate the two models as viable alternatives to dark energy determined from thermodynamics in the field of the holographic principle.

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“…Those results are compatible with the ΛCDM paradigm [109][110][111][112][113][114][115][116] and correspond to a barotropic factor inside the interval: = −1.0820…”

Section: Late-time Evolutionsupporting

confidence: 83%

A Thermodynamic Approach to Holographic Dark Energy

Luongo

2017

Advances in High Energy Physics

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“…Further, a linear combination of the above rates [27] predicts two accelerating phases of the universe, one at early phase of its evolution and the second one stands for the present day acceleration. Furthermore, the same linear combination of the above rates claims the decelerating nature of our universe in future [22], as also predicted in some other contexts [46,47]. Therefore, we begin with some phenomenological but general choices for Γ of the form Γ = 3βHf (z) where f (z) is any arbitrary function of the redshift z, and β is any free non-negative parameter describing the rate of the creation.…”

Section: Field Equations In Flrw Universementioning

confidence: 84%

Gravitationally influenced particle creation models and late-time cosmic acceleration

Pan

Pal²,

Pramanik

2018

Int. J. Geom. Methods Mod. Phys.

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In this work we focus on the gravitationally influenced adiabatic particle creation process, a mechanism that does not need any dark energy or modified gravity models to explain the current accelerating phase of the universe. Introducing some particle creation models that generalize some previous models in the literature, we constrain the cosmological scenarios using the latest compilation of the Type Ia Supernovae data only, the first indicator of the accelerating universe. Aside from the observational constraints on the models, we examine the models using two model independent diagnoses, namely the cosmography and Om. Further, we establish the general conditions to test the thermodynamic viabilities of any particle creation model. Our analysis shows that at late-time, the models have close resemblance to that of the ΛCDM cosmology, and the models always satisfy the generalized second law of thermodynamics under certain conditions. PACS numbers: 05.70.Ln, 04.40.Nr, 98.80.Cq.

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“…This result is consistent with the one presented by Barrow, Bean and Magueijo [63], in which arises the possibility of a scenario with accelerated expansion of the universe and that does not imply an eternal accelerated expansion. In [60], an extensive analysis of this possibility is made (see also [64]), which includes a cosmographic analysis like the one presented in the current work. This transient accelerating phase can be also a clear behavior of dynamical DE at low redshift for models with variation of the density of DE over time.…”

Section: History Of the Expansion And Cosmographymentioning

confidence: 99%

Constraints on Dark Energy Models from Galaxy Clusters and Gravitational Lensing Data

Bonilla

Castillo

2018

Universe

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Abstract:The Sunyaev-Zel'dovich (SZ) effect is a global distortion of the Cosmic Microwave Background (CMB) spectrum as a result of its interaction with a hot electron plasma in the intracluster medium of large structures gravitationally viralized such as galaxy clusters (GC). Furthermore, this hot gas of electrons emits X-rays due to its fall in the gravitational potential well of the GC. The analysis of SZ and X-ray data provides a method for calculating distances to GC at high redshifts. On the other hand, many galaxies and GC produce a Strong Gravitational Lens (SGL) effect, which has become a useful astrophysical tool for cosmology. We use these cosmological tests in addition to more traditional ones to constrain some alternative dark energy (DE) models, including the study of the history of cosmological expansion through the cosmographic parameters. Using Akaike and Bayesian Information Criterion, we find that the wCDM and ΛCDM models are the most favoured by the observational data. In addition, we found at low redshift a peculiar behavior of slowdown of the universe, which occurs in dynamical DE models when we use data from GC.

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Could the cosmic acceleration be transient? A cosmographic evaluation

Cited by 60 publications

References 50 publications

A Thermodynamic Approach to Holographic Dark Energy

A Thermodynamic Approach to Holographic Dark Energy

Gravitationally influenced particle creation models and late-time cosmic acceleration

Constraints on Dark Energy Models from Galaxy Clusters and Gravitational Lensing Data

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