Inflation Driven by Non-Linear Electrodynamics

Abstract

We investigate the inflation driven by a nonlinear electromagnetic field based on an NLED lagrangian density ${\mathcal{L}}_{\text{nled}}=-Ff\left(F\right)$, where $f\left(F\right)$ is a general function depending on $F$. We first formulate an $f$-NLED cosmological model with a more general function $f\left(F\right)$ and show that all NLED models can be expressed in this framework; then, we investigate in detail two interesting examples of the function $f\left(F\right)$. We present our phenomenological model based on a new Lagrangian for NLED. Solutions to the field equations with the physical properties of the cosmological parameters are obtained. We show that the early Universe had no Big-Bang singularity, which accelerated in the past. We also investigate the qualitative implications of NLED by studying the inflationary parameters, like the slow-roll parameters, spectral index $n_s$, and tensor-to-scalar ratio $r$, and compare our results with observational data. Detailed phase-space analysis of our NLED cosmological model is performed with and without matter source. As a first approach, we consider the motion of a particle of unit mass in an effective potential. Our systems correspond to fast-slow systems for physical values of the electromagnetic field and the energy densities at the end of inflation. We analyze a complementary system using Hubble-normalized variables to investigate the cosmological evolution before the matter-dominated Universe.

27 pages, 13 compound figures

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• Universe inflation and nonlinear electrodynamics
• New Black Hole Solutions of Second and First Order Formulations of Nonlinear Electrodynamics
• Qualitative analysis of a quasi-magnetic universe
• How to obtain slow roll inflation driven by non-linear electrodynamics