Power-Law NLED-Based Magnetic Universe Can Mimic Phantom Behavior
Ricardo Garc\'ia-Salcedo, Tame Gonzalez, Claudia Moreno, Israel Quiros

TL;DR
This paper explores how a magnetic universe governed by non-linear electrodynamics can exhibit phantom-like behavior, influence cosmic evolution, and potentially avoid singularities and rip events, especially when considering braneworld effects.
Contribution
It introduces a class of NLED models with power-law Lagrangians that can mimic phantom fields and analyzes their cosmological implications including stability and singularity avoidance.
Findings
Magnetic fields can mimic phantom behavior depending on model parameters.
Equilibrium points suggest possible transitions from matter-dominated to inflationary phases.
Braneworld effects can prevent big bang and big rip singularities.
Abstract
We study the cosmic dynamics of a magnetic universe supported by non-linear electrodynamics (NLED) Lagrangeans that are proportional to powers of the electromagnetic invariant ( is an overall constant). For simplicity we focus in the case when depends on the magnetic field alone, a case dubbed in the bibliography as ''magnetic universe''. Our results demonstrate that, depending on the values of the free parameter , the magnetic field can mimic phantom field behavior, an effect previously found in other contexts. It is demonstrated that, since there are found equilibrium points in the phase space of these models that can be associated with magnetic-dominated past and future attractors, a combination of positive and negative powers of may lead to interesting cosmological behavior. In particular, a cosmological scenario where the universe might evolve…
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Taxonomy
TopicsCosmology and Gravitation Theories · Solar and Space Plasma Dynamics · Geophysics and Gravity Measurements
