Modified GBIG scenario as an alternative for dark energy

Nozari, Kourosh; Rashidi, Narges

doi:10.1088/1475-7516/2009/09/014

Cited by 19 publications

(20 citation statements)

References 130 publications

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“…The induced gravity on the brane is modified in the spirit of f (R) gravity which itself provides the facility to selfaccelerate even the normal, ghost-free branch of the DGP-inspired model [11,19]. The model also considers a non-minimal coupling between the canonical scalar field on the brane and the modified induced gravity.…”

Section: Discussionmentioning

confidence: 99%

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Holographic Dark Energy From a Modified Gbig Scenario

Nozari

Rashidi

2010

Int. J. Mod. Phys. D

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We construct a holographic dark energy model in a braneworld setup that gravity is induced on the brane embedded in a bulk with Gauss-Bonnet curvature term. We include possible modification of the induced gravity and its coupling with a canonical scalar field on the brane. Through a perturbational approach to calculate the effective gravitation constant on the brane, we examine the outcome of this model as a candidate for holographic dark energy. PACS: 04.50.-h, 98.80.-k, 95.36.+x

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Section: Discussionmentioning

confidence: 99%

“…The generalized cosmological dynamics of this setup is given by the following Friedmann equation ( see [11] for details)…”

Section: The Setupmentioning

confidence: 99%

Holographic Dark Energy From a Modified Gbig Scenario

Nozari

Rashidi

2010

Int. J. Mod. Phys. D

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“…The phantom-like behavior is based on the definition of an effective energy density which is corresponding to a balance between the cosmological constant and geometrical effects encoded on the Hubble rate evolution [36][37][38][39][40][41][42][43][44][45], [47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66]. The phantom-like behavior on the brane is based on the definition of an effective energy density ρ ef f which increases with cosmic time and an effective equation of state parameter always less than −1, ω ef f < −1.…”

Section: The Phantom-like Behaviormentioning

confidence: 99%

“…Late-time acceleration can be explained in the self-accelerating branch without invoking any unknown dark energy component. However, the normal branch requires a dark energy component to accommodate the current observations [36][37][38][39][40][41][42][43][44][45]. Although the self-accelerating branch explains the late-time acceleration in a fascinating manner, it suffers from serious theoretical problems such as the ghost issue [46].…”

Section: Introductionmentioning

confidence: 99%

“…Fortunately the normal branch is free from instabilities. Recently it has been shown that the normal branch of the DGP braneworld scenario which is not self-accelerating can realize phantom-like behavior without introducing any phantom field on the brane [36][37][38][39][40][41][42][43][44][45]. By phantom-like behavior we mean an effective energy density which is positive and grows with time and its equation of state parameter stays always less than −1.…”

Section: Introductionmentioning

confidence: 99%

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Phantom Mimicry on the Normal Branch of a DGP-Inspired Braneworld Scenario With Curvature Effect

Nozari

Alipour

2010

Mod. Phys. Lett. A

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It has been shown recently that phantom-like effect can be realized on the normal branch of the DGP setup without introduction of any phantom matter neither in the bulk nor on the brane and therefore without violation of the null energy condition. It has been shown also that inclusion of the Gauss-Bonnet term in the bulk action modifies this picture via curvature effects. Here, based on the Lue-Starkman conjecture on the dynamical screening of the brane cosmological constant in the DGP setup, we extend this proposal to a general DGP-inspired f (R, φ) model that stringy effects in the ultraviolet sector of the theory are taken into account by inclusion of the Gauss-Bonnet term in the bulk action. We study cosmological dynamics of this setup, especially its phantom-like behavior and possible crossing of the phantom divide line especially with a non-minimally coupled quintessence field on the brane. In this setup, scalar field and curvature quintessence are treated in a unified framework. 95.36.+x, 98.80.Cq

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Observational constraints on the normal branch of a warped DGP cosmology

Azizi¹,

Movahed²,

Nozari³

2012

New Astronomy

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We investigate observational constraints on the normal branch of the warped DGP braneworld cosmology by using observational data from Type Ia Supernovae (SNIa), Baryon Acoustic Oscillations (BAO), Cosmic Microwave Background (CMB) and Baryon Gas Mass Fraction of cluster of galaxies. The best fit values of model free parameters are: Ω m = 0.240 +0.050 −0.130 and Ω rc = 0.000 +0.014 at 1σ confidence interval by using Gold sample SNIa+CMB shift parameter+BAO+Gas mass fraction of baryons in cluster of galaxies. The results for essence sample SNIa combined with CMB shift parameter, BAO and Baryon Gas mass fraction correspont to: Ω m = 0.220 +0.020 −0.170 and Ω rc = 0.000 +0.025 at 68.3% confidence interval. We determine the age of the universe by using these best fit values. We also study the effective cosmological dynamics on the brane via an effective equation of state parameter and the deceleration parameter to conclude that an effective phantom-like behavior arises in this scenario. 98.80.Es, 95.36.+x PACS AbstractWe investigate observational constraints on the normal branch of the warped DGP braneworld cosmology by using observational data from Type Ia Supernovae (SNIa), Baryon Acoustic Oscillations (BAO), Cosmic Microwave Background (CMB) and Baryon Gas Mass Fraction of cluster of galaxies. The best fit values of model free parameters are: Ω m = 0.240 +0.050 −0.130 and Ω rc = 0.000 +0.014 at 1σ confidence interval by using Gold sample SNIa+CMB shift parameter+BAO+Gas mass fraction of baryons in cluster of galaxies. The results for essence sample SNIa combined with CMB shift parameter, BAO and Baryon Gas mass fraction correspont to: Ω m = 0.220 +0.020 −0.170 and Ω rc = 0.000 +0.025 at 68.3% confidence interval. We determine the age of the universe by using these best fit values. We also study the effective cosmological dynamics on the brane via an effective equation of state parameter and the deceleration parameter to conclude that an effective phantom-like behavior arises in this scenario. 98.80.Es, 95.36.+x PACS

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Modified GBIG scenario as an alternative for dark energy

Cited by 19 publications

References 130 publications

Holographic Dark Energy From a Modified Gbig Scenario

Holographic Dark Energy From a Modified Gbig Scenario

Phantom Mimicry on the Normal Branch of a DGP-Inspired Braneworld Scenario With Curvature Effect

Observational constraints on the normal branch of a warped DGP cosmology

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