Stability of the accelerated expansion in nonlinear electrodynamics

Sharif, M.; Mumtaz, Saadia

doi:10.1140/epjc/s10052-017-4704-1

Cited by 22 publications

(16 citation statements)

References 34 publications

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“…≡μ 2 ǫ . The equation of motion (13), implies that we can take an effective potential forφ whose behavior around the initial point is determined by…”

Section: Hybrid Quintessence With Nonminimal Couplingmentioning

confidence: 99%

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Cosmic acceleration in screening hybrid quintessence model

Sadjadi¹

2018

Physics of the Dark Universe

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A formalism for the appearance of dark energy in the matter dominated era, leading to a persistent de Sitter expansion at the late time is proposed. Our framework is a hybrid quintessence model with a nonminimal coupling to the Ricci scalar. Coupling to the curvature leads to the screening effect and triggers the dark energy evolution. The coupling of the scalar fields drives this evolution to a de Sitter stable fixed point. These occur via successive Z 2 symmetry breakings. * mohsenisad@ut.ac.ir

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“…≡μ 2 ǫ . The equation of motion (13), implies that we can take an effective potential forφ whose behavior around the initial point is determined by…”

Section: Hybrid Quintessence With Nonminimal Couplingmentioning

confidence: 99%

“…Astrophysical data indicate that the expansion of the Universe is accelerating [1,2]. The origin of this positive acceleration which has begun from the matter dominated era is still unclear but may be caused by a scalar field, whose pressure is negative, called quintessence [3][4][5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Cosmic acceleration in screening hybrid quintessence model

Sadjadi¹

2018

Physics of the Dark Universe

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“…So, as it has been shown in Refs. [38][39][40][41][42][55][56][57][58][59][60][61][62][63][64][65][66], a nonlinear magnetic monopole field can also play an important role in the inflationary dynamics, despite breaking the conformal invariance of the Maxwell theory [39,40]. Furthermore, since a nonminimal coupling with curvature can affect significantly the physical results obtained in these models [26], here, we are going to study a nonlinear magnetic monopole field nonminimally coupled to curvature and its implications for the early inflationary phase.…”

Section: Introductionmentioning

confidence: 99%

Inflation from a nonlinear magnetic monopole field nonminimally coupled to curvature

Otalora

Овгун

Saavedra

et al. 2018

J. Cosmol. Astropart. Phys.

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In the context of nonminimally coupled f (R) gravity theories, we study early inflation driven by a nonlinear monopole magnetic field which is nonminimally coupled to curvature. In order to isolate the effects of the nonminimal coupling between matter and curvature we assume the pure gravitational sector to have the Einstein-Hilbert form. Thus, we study the most simple model with a nonminimal coupling function which is linear in the Ricci scalar. From an effective fluid description, we show the existence of an early exponential expansion regime of the Universe, followed by a transition to a radiation-dominated era. In particular, by applying the most recent results of the Planck collaboration we set the limits on the parameter of the nonminimal coupling, and the quotient of the nonminimal coupling and the nonlinear monopole magnetic scales. We found that these parameters must take large values in order to satisfy the observational constraints. Furthermore, by obtaining the relation for the graviton mass, we show the consistency of our results with the recent gravitational wave data GW170817 of LIGO and Virgo.

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“…A study of GSLT in magnetic universe in light of non-linear electrodynamics in isotropic [41] and anisotropic background [42] has been investigated. Sharif et al [43] have recently discussed the stability of accelerated expansion in light of non-linear electrodynamics.…”

Section: Introductionmentioning

confidence: 99%

Accelerating cosmologies with nonlinear electrodynamics

Singh

Hulke

Singh³

2018

Can. J. Phys.

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In this paper, we consider the framework of nonlinear electrodynamics in locally rotationally symmetric (LRS) Bianchi-I universe model composed of magnetic fluid. It has been shown that an accelerated universe expansion takes place if the nonlinear electromagnetic field is a source of gravitational field. In this model, after the big bang, the universe undergoes inflation and the accelerated expansion, dissipates the initial anisotropy of the curvature part without using a selected initial condition. Further validity of generalised second law of thermodynamics in the cosmological model enclosed by apparent horizon is investigated. We also discuss the classical stability of the cosmological model and observational viability of the model.

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Stability of the accelerated expansion in nonlinear electrodynamics

Cited by 22 publications

References 34 publications

Cosmic acceleration in screening hybrid quintessence model

Cosmic acceleration in screening hybrid quintessence model

Inflation from a nonlinear magnetic monopole field nonminimally coupled to curvature

Accelerating cosmologies with nonlinear electrodynamics

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