Acceleration of universe by nonlinear electromagnetic fields

Kruglov, S. I.

doi:10.1142/s0218271816400022

Cited by 54 publications

(59 citation statements)

References 36 publications

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“…Recently, the idea of NED has been proposed as a solution to source the Universe acceleration [5][6][7]. In the early Universe the effect of the NED may have been very strong and, in principle, this may also explain the inflation.…”

Section: Introductionmentioning

confidence: 99%

“…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%

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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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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Falsifying cosmological models based on a non-linear electrodynamics

et al. 2018

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“…Vollick [15] considered the FRW model of the universe with NLED and found that the model entailed will show a period of late-time acceleration for E 2 < 3B 2 . Kruglov [16] found that the universe tends to accelerate in a magnetic background at the early era due to NLED model. Ovgun [17] formulated an analytical nonsingular extension of isotropic and homogeneous solutions by presenting a new mathematical model in nonlinear magnetic monopole fields.…”

Section: Introductionmentioning

confidence: 99%

Stability of the accelerated expansion in nonlinear electrodynamics

Sharif

Mumtaz

2017

Eur. Phys. J. C

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This paper is devoted to the phase space analysis of an isotropic and homogeneous model of the universe by taking a noninteracting mixture of the electromagnetic and viscous radiating fluids whose viscous pressure satisfies a nonlinear version of the Israel-Stewart transport equation. We establish an autonomous system of equations by introducing normalized dimensionless variables. In order to analyze the stability of the system, we find corresponding critical points for different values of the parameters. We also evaluate the power-law scale factor whose behavior indicates different phases of the universe in this model. It is concluded that the bulk viscosity as well as electromagnetic field enhances the stability of the accelerated expansion of the isotropic and homogeneous model of the universe.

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“…Such problems may be absent in NLED. It is interesting that NLED coupled with general relativity (GR) can give the universe acceleration [12] - [19]. But electromagnetic fields in BI electrodynamics do not drive the universe to accelerate [15].…”

Section: Introductionmentioning

confidence: 99%

Magnetized black holes and nonlinear electrodynamics

Kruglov

2017

Int. J. Mod. Phys. A

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A new model of nonlinear electrodynamics with two parameters is proposed. We study the phenomenon of vacuum birefringence, the causality and unitarity in this model. There is no singularity of the electric field in the center of point-like charges and the total electrostatic energy is finite. We obtain corrections to the Coulomb law at r → ∞. The weak, dominant and strong energy conditions are investigated. Magnetized charged black hole is considered and we evaluate the mass, metric function and their asymptotic at r → ∞ and r → 0. The magnetic mass of the black hole is calculated. The thermodynamic properties and thermal stability of regular black holes are discussed. We calculate the Hawking temperature of black holes and show that there are first-order and second-order phase transitions. The parameters of the model when the black hole is stable are found.

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Acceleration of universe by nonlinear electromagnetic fields

Cited by 54 publications

References 36 publications

Falsifying cosmological models based on a non-linear electrodynamics

Falsifying cosmological models based on a non-linear electrodynamics

Stability of the accelerated expansion in nonlinear electrodynamics

Magnetized black holes and nonlinear electrodynamics

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