Probing dark energy with braneworld cosmology in the light of recent cosmological data

García‐Aspeitia, Miguel A.; Magaña, Juan; Hernández-Almada, A.; Motta, V.

doi:10.1142/s0218271818500062

Cited by 32 publications

(28 citation statements)

References 44 publications

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“…According to Verde et al (2019), the increased Hubble rate and the fact that the deviations from the ΛCDM model concerns only the earliest epochs prepares the brane cosmology as a candidate to overcome the tensions between the early and late universe. This seems to be confirmed by the Planck Data from 2015, since the best fit values of the Hubble constant do not generate a tension between the early and late universe (see García-Aspeitia et al (2018)).…”

Section: Cosmological Evolution On the Branesupporting

confidence: 52%

Standard Cosmology on the Anti-de Sitter boundary

Henke

2020

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Despite the great success of the standard model of cosmology, called ΛCDM (Lambda Cold Dark Matter) model, there are many open questions and problems associated with it. For example, this model is formulated in a space-time with positive curvature (de Sitter space-time), while gravity can probably only connected to quantum field theories in a space-time with negative curvature (Anti-de Sitter space-time). Moreover, the cosmological vacuum energy density is of the same order of magnitude as the matter energy density (coincidence problem) and shows a large discrepancy to the vacuum energy density of quantum field theories (cosmological constant problem). Also, it has recently been agreed that there is a tension between the early and late universe.As a minimum requirement for an alternative model, it should have a clear physical origin and keep the observational quality of the ΛCDM model. These conditions apply to the well-known brane world cosmology. However, to be an alternative, the quadratical energy density of this model requires an undesirable fine tuning.The paper develops a new brane world model which is formulated in an Anti-de Sitter (AdS) universe and avoids the quadratical energy density by using a holographic renormalisation. The renormalised quasilocal energy-momentum tensor is applied for space-time and matter as originally proposed by Brown and York (1993) and not as the expectation value of the energy-momentum tensor in the conformal field theory (CFT). On the AdS boundary it is demonstrated that this brane model equals an effective de Sitter ΛCDM model, whereas the brane model near the AdS boundary agrees to the ΛCDM model except the earliest times. Finally, it is shown that the coincidence problem is avoided and the cosmological constant problem, if not solved, is greatly reduced.

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Section: Cosmological Evolution On the Branesupporting

confidence: 52%

Standard Cosmology on the Anti-de Sitter boundary

Henke

2020

Preprint

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“…Due to Λ CDM tensions [5], particularly those associated with the problems that unfold from the cosmological constant (CC) [6,7], such as the well-known fine-tuning and coincidence problems [8], a plethora of models have emerged to explain the dark energy nature as an alternative to the CC [9]. Examples of them are quintessence [10], k-essence [11], braneworlds [12][13][14][15], among others (see for instance [16]). However, many models are focused only on a fluid (or topology) with the capability of accelerating the universe (DE), being the DM treated as a separate entity, lacking a unifying framework with the DE.…”

Section: Introductionmentioning

confidence: 99%

Cosmological constraints on alternative model to Chaplygin fluid revisited

et al. 2019

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In this work we explore an alternative phenomenological model to Chaplygin gas proposed by H. Hova et. al.[1], consisting on a modification of a perfect fluid, to explain the dynamics of dark matter and dark energy at cosmological scales immerse in a flat or curved universe. Adopting properties similar to a Chaplygin gas, the proposed model is a mixture of dark matter and dark energy components parameterized by only one free parameter denoted as µ. We focus on contrasting this model with the most recent cosmological observations of Type Ia Supernovae and Hubble parameter measurements. Our joint analysis yields a value µ = 0.843 +0.014 −0.015 (0.822 +0.022 −0.024 ) for a flat (curved) universe. Furthermore, with these constraints we also estimate the deceleration parameter today q 0 = −0.67 ± 0.02 (−0.51 ± 0.07), the acceleration-deceleration transition redshift z t = 0.57 ± 0.04 (0.50 ± 0.06), and the universe age t A = 13.108 +0.270 −0.260 × (12.314 +0.590 −0.430 ) Gyrs. We also report a best value of Ω k = 0.183 +0.073 −0.079 consistent at 3σ with the one reported by Planck Collaboration. Our analysis confirm the results by Hova et al, this Chaplygin gas-like is a plausible alternative to explain the nature of the dark sector of the universe.

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“…Extra-dimensions scenarios have been proposed to solve the CC problems such as Brane-world models, which accelerate the Universe under the assumption of a 4 + 1-dimensional space-time (the bulk) containing an ordinary 3 + 1-dimensional manifold (the brane) through a threshold radius r s . However, the majority of them (including the Randall and Sundrum (RS) 1 [11,12] models) 1 RS models are divided in the case of two (RSI) and one brane achieve a stable late cosmic acceleration only by including DE [13,14]. Although models with variable brane tension (VBT), λ(t) ∝ a(t), sourcing from thermodynamics assumptions (Eötvös law) have been studied previously 2 [15][16][17][18][19][20][21][22][23], they either have not been contrasted with recent observations or still need the introduction of a DE fluid to reproduce the late acceleration.…”

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confidence: 99%

Brane with variable tension as a possible solution to the problem of the late cosmic acceleration

et al. 2018

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Braneworld models have been proposed as a possible solution to the problem of the accelerated expansion of the Universe. The idea is to dispense the dark energy (DE) and drive the late-time cosmic acceleration with a five-dimensional geometry. Here, we investigate a brane model with variable brane tension as a function of redshift called chrono-brane. We propose the polynomial λ = (1 + z) n function inspired in tracker-scalar-field potentials. To constrain the n exponent we use the latest observational Hubble data from cosmic chronometers, Type Ia Supernovae from the full JLA sample, baryon acoustic oscillations and the posterior distance from the cosmic microwave background of Planck 2015 measurements. A joint analysis of these data estimates n 6.19 which generates a DE-like or cosmological-constant-like term, in the Friedmann equation arising from the extra dimensions. This model is consistent with these data and can drive the Universe to an accelerated phase at late times. PACS numbers: 04.50.-h,98.80.-k

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Probing dark energy with braneworld cosmology in the light of recent cosmological data

Cited by 32 publications

References 44 publications

Standard Cosmology on the Anti-de Sitter boundary

Standard Cosmology on the Anti-de Sitter boundary

Cosmological constraints on alternative model to Chaplygin fluid revisited

Brane with variable tension as a possible solution to the problem of the late cosmic acceleration

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