Universe acceleration and nonlinear electrodynamics

Kruglov, S. I.

doi:10.1103/physrevd.92.123523

Cited by 109 publications

(82 citation statements)

References 14 publications

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“…For LRS BI metric (2), we calculate the relation of R, R ij R ij , R ijkl R ijkl with ρ and p. For FRW metric, relations of R, R ij R ij , R ijkl R ijkl with ρ and p has been obtained in [23]. With general n, our results generalizes the result of FRW metric.…”

Section: Discussionmentioning

confidence: 52%

“…This shows that GSLT is not always satisfied in the present model. For n = 1, our model reduces to FRW model [23]. With n, other than 1, our model generalizes [23], here we conclude that GSLT is not always satisfied in this class of NLE models given by Lagrangian density as in [22].…”

Section: Discussionmentioning

confidence: 67%

“…In the following, we will omit brackets. Under these assumptions, the energy-momentum tensor of EM field associated with L em suggest the following form of energy density (ρ) and pressure (p) [23] …”

Section: Cosmological Model and Equationsmentioning

confidence: 99%

“…The NLE coupled with gravity may give the negative pressure and hence accelerate the universe [16,17,21]. The evolution of universe in the Einstein-NLE background prevent the initial big bang singularity [22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 52%

Section: Discussionmentioning

confidence: 67%

Section: Cosmological Model and Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Accelerating cosmologies with nonlinear electrodynamics

Singh

Hulke

Singh³

2018

Can. J. Phys.

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“…In this scenario the NEF can be considered as a source of the gravitational field and, as a consequence, nonlinear magnetic fields may be a driven mechanism of the inflation of the Universe. In this line of research, very recently many NED models have been investigated using a stochastic magnetic background, i. e. the cosmic background with the wavelength smaller than the curvature, with a non-vanishing < B 2 >, where matter should be identified with a primordial plasma [5,6,8,[12][13][14]16,64]. Thermal fluctuations in a dissipative plasma, i.e.…”

Section: Introductionmentioning

confidence: 99%

Falsifying cosmological models based on a non-linear electrodynamics

et al. 2018

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Recently, the nonlinear electrodynamics (NED) has been gaining attention to generate primordial magnetic fields in the Universe and also to resolve singularity problems. Moreover, recent works have shown the crucial role of the NED on the inflation. This paper provides a new approach based on a new model of NED as a source of gravitation to remove the cosmic singularity at the big bang and explain the cosmic acceleration during the inflation era on the background of stochastic magnetic field. Also, we found a realization of a cyclic Universe, free of initial singularity, due to the proposed NED energy density. In addition, we explore whether a NED field without or with matter can be the origin of the late-time acceleration. For this we obtain explicit equations for H (z) and perform a MCMC analysis to constrain the NED parameters by using 31 observational Hubble data (OHD) obtained from cosmic chronometers covering the redshift range 0 < z < 1.97; and with the joint-light-analysis (JLA) SNIa compilation consisting in 740 data points in the range 0.01 < z < 1.2. All our constraints on the current magnetic field give B 0 ∼ 10 −31 cm −1 , which are larger than the upper limit 10 −33 cm −1 by the Planck satellite implying that NED cosmologies could not be suitable to explain the Universe late-time dynamics. However, the current data is able to falsify the scenario at late times. Indeed, one is able to reconstruct the deceleration parameter q(z) using the best fit values of the parameters obtained from OHD and SNIa data a e-mail: ali.ovgun@pucv.cl URL: https://www.aovgun.com b e-mail: genly.leon@ucn.cl c e-mail: juan.magana@uv.cl d e-mail: kimet.jusufi@unite.edu.mk sets. If the matter component is not included, the data sets predict an accelerated phase in the early Universe, but a non accelerated Universe is preferred in the current epoch. When a matter component is included in the NED cosmology, the data sets predict a q(z) dynamics similar to that of the standard model. Moreover, both cosmological data favor up to 2σ confidence levels an accelerating expansion in the current epoch, i.e., the Universe passes of a decelerated phase to an accelerated stage at redshift ∼ 0.6. Therefore, although the NED cosmology with dust matter predict a value B 0 higher than the one measured by Planck satellite, it is able to drive a late-time cosmic acceleration which is consistent with our dynamical systems analysis and it is preferred by OHD and SNIa data sets.

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Nonlinear arcsin‐electrodynamics and asymptotic Reissner‐Nordström black holes

Kruglov

2016

Annalen der Physik

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A model of nonlinear electrodynamics with the Lagrangian density L = −(1/β) arcsin(βF µν F µν /4) is proposed. The scale invariance and the dual invariance of electromagnetic fields are broken in the model. In the limit β → 0 one comes to Maxwell's electrodynamics and the scale and dual invariances are recovered. We investigate the effect of coupling electromagnetic fields with the gravitational field. The asymptotic black hole solution is found which is similar to the Reissner-Nordström solution. We obtain corrections to Coulomb's law and to the Reissner-Nordström solution in the model proposed. The existence of the regular asymptotic at r → 0 was demonstrated. The mass of the black hole is calculated possessing the electromagnetic origin. It was shown that there are not superluminal fluctuations and principles of causality and unitarity take place.

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Universe acceleration and nonlinear electrodynamics

Cited by 109 publications

References 14 publications

Accelerating cosmologies with nonlinear electrodynamics

Accelerating cosmologies with nonlinear electrodynamics

Falsifying cosmological models based on a non-linear electrodynamics

Nonlinear arcsin‐electrodynamics and asymptotic Reissner‐Nordström black holes

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