Emergent universe in a Jordan–Brans–Dicke theory

Campo, Sérgio del; Herrera, Ramón; Labraña, Pedro

doi:10.1088/1475-7516/2007/11/030

Cited by 84 publications

(86 citation statements)

References 43 publications

(110 reference statements)

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“…Universe based on alternative theories to General Relativity, like Jordan-Brans-Dicke [68], which present stable past eternal static regime [19,20]. It is interesting explore this possibility because emergent universe models based on GR suffer from instabilities, associated with the instability of the Einstein static universe.…”

Section: Discussionmentioning

confidence: 99%

“…It is interesting explore this possibility because emergent universe models based on GR suffer from instabilities, associated with the instability of the Einstein static universe. This instability is possible to cure by going away from GR, for example, by consider a Jordan Brans Dicke theory at the classical level, where it have been found that contrary to general relativity, a static universe could be stable, see [19,20]. Another possibility is considering non-perturbative quantum corrections of the Einstein field equations, either coming from a semiclassical state in the framework of loop quantum gravity [13,17] or braneworld cosmology with a timelike extra dimension [16,18].…”

Section: Discussionmentioning

confidence: 99%

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Emergent universe by tunneling

Labraña

2012

Phys. Rev. D

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In this work we propose an alternative scheme for an Emergent Universe scenario where the universe is initially in a static state supported by a scalar field located in a false vacuum. The universe begins to evolve when, by quantum tunneling, the scalar field decays into a state of true vacuum. The Emergent Universe models are interesting since they provide specific examples of nonsingular inflationary universes.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Emergent universe by tunneling

Labraña

2012

Phys. Rev. D

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“…However, most simple models developed in a context of General Relativity suffer from instabilities, associated with the instability of Einstein's static universe [17]. On the other hand, Tensor-Scalar theories can give us the possibility to explore the viability of a stable UE model in which there is no initial singularity [19,18]. The theory normally associated with Scalar-Tensor models is the Jordan-Brans-Dicke (JBD) theory of gravitation [20,21].…”

Section: Introductionmentioning

confidence: 99%

Tunneling and the Emergent Universe scheme in a JBD Theory

Cossio

Labraña

2018

J. Phys.: Conf. Ser.

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Abstract.In this work it is proposed an alternative scheme for an Emergent Universe scenario in the context of a Jordan-Brans-Dicke theory, where the universe is initially in a static state supported by a scalar field located in a false vacuum. The universe begins to evolve when, by quantum tunneling, the scalar field decays into a state of true vacuum.In particular, in this work we study the stability of the static universe, under the aforementioned characteristics, and the probability of creating a true vacuum bubble. It is shown that in this model, unlike what happens in previous works, the static universe is stable under small classical perturbations.

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“…The modified Gauss-Bonnet gravity as gravitational alternative for dark energy is however considered by Nojiri and Oddintsov [19]. It is also shown recently that EU model can be successfully implemented in Brane world gravity [20,21], Brans-Dicke theory [22]. A number of cosmological models are obtained with different cosmological fluids and fields [14,[23][24][25][26] where initial singularity problem is addressed.…”

Section: Introductionmentioning

confidence: 99%

Observational constraints on EoS parameters of emergent universe

Paul

Thakur²

2017

Astrophys Space Sci

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Abstract. We investigate emergent universe model using recent observational data for the background tests as well as for the growth tests. The background test data comprises of Hubble data, Baryon Acoustic Oscillation (BAO) data, cosmic microwave background (CMB) shift data, Union compilation data. The observational growth data are obtained from Wiggle-Z measurements and rms mass fluctuations data from Lyman-α measurements at different red shifts. The flat emergent universe model obtained by Mukherjee et. al. is permitted with a non-linear equation of state (in short, EoS) (p = Aρ − Bρ 1 2 ), where A and B are constants. The observed cosmological data are used here to estimate the range of allowed values of EoS parameters numerically. The best-fit values of the EoS and growth parameters are determined making use of chi-square minimization technique. The analysis is carried out here considering the Wang-Steinhardt ansatz for growth index (γ) and growth function (f defined as f = Ω γ m (a)). Subsequently, the best-fit values of the EoS parameters are used to study the evolution of the growth function f , growth index γ, state parameter ω with red shift parameter z. The present value of the parameters, namely, f , γ, ω, Ω m are also estimated. The late accelerating phase of the universe in the model is accommodated satisfactorily.

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Emergent universe in a Jordan–Brans–Dicke theory

Cited by 84 publications

References 43 publications

Emergent universe by tunneling

Emergent universe by tunneling

Tunneling and the Emergent Universe scheme in a JBD Theory

Observational constraints on EoS parameters of emergent universe

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