Matter-antimatter asymmetry induced by non-linear electrodynamics

Abstract

In this work, we propose an economical model to address some open cosmological problems such as the absence of the initial cosmological singularity, an early acceleration of the Universe and the generation of matter–antimatter asymmetry. The model is based on a scenario in which the early Universe consists of a non-linear electrodynamics (NLED) fields. It is found that the NLED model has an equation of state p = 1 3 ρ − 4 3 β ρ 1 + α which shows that the Universe undergoes an early epoch acceleration to a radiation era given by p = 1 3 ρ . We show that the singularities in the energy density, pressure and curvature are absent at early stages. In our scenario, the baryon asymmetry is generated by the non-linearity parameter β. Additionally, we calculate the resulting baryon asymmetry and discuss how a successful gravitational baryogenesis is obtained for different values of the model’s parameter space.

Non‐Linear Electrodynamics in Blandford–Znajek Energy Extraction

“…[56][57][58][59][60][61][62][63][64][65][66][67][68][69] In the context of primordial physics, instead, NLED, when coupled to a gravitational field, can give the necessary negative pressure and enhance cosmic inflation [70] and some models also prevent cosmic singularity at the big bang [71][72][73][74][75] and ensure matter-antimatter asymmetry. [76] The reason to consider NLED in the primordial Universe comes from the assumption that electromagnetic and gravitational fields were very strong during the evolution of the early universe, thereby leading to quantum correction and giving birth to NLED. [77,78] Recently, the non-linear electrodynamics has been also invoked as an available framework for generating the primordial magnetic fields (PMFs) in the Universe.…”

Periodic cosmic evolution in f(Q) gravity formalism

“…Similarly, with the presence of nonlinear electrodynamics, the cyclic behavior of the universe has been studied without initial singularity. However this nonlinear electrodynamics with or without matter can represent late-time acceleration [3,4].…”

“…In the present work, we concentrate on the newer f (Q) theory of gravity which recently is centre of much research attention, see [4][5][6][7][8][9][10][11][12][13][14][15] and the references therein for a detailed list of publications on this theory. The cyclic behavior of the universe in the presence of a perfect fluid matter source.…”