Primordial magnetic fields from a non-singular bouncing cosmology

Abstract

Although inflation is a natural candidate to generate the lengths of coherence of magnetic fields needed to explain current observations, it needs to break conformal invariance of electromagnetism to obtain significant magnetic amplitudes. Of the simplest realizations are the kinetically-coupled theories $f^2(\varphi )F_{\mu \nu }{F}^{\mu \nu }$ (or $IFF$ theories). However, these are known to suffer from electric fields backreaction or the strong coupling problem. In this work we shall confirm that such class of theories are problematic to support magnetogenesis during inflationary cosmology. On the contrary, we show that a bouncing cosmology with a contracting phase dominated by an equation of state with $p>-\rho /3$ can support magnetogenesis, evading the {backreaction/strong-coupling problem}. Finally, we study safe magnetogenesis in a particular bouncing model with an ekpyrotic-like contracting phase. In this case we found that $f^2(\varphi )F^2$-instabilities might arise during the final kinetic-driven expanding phase for steep ekpyrotic potentials.

33 pages, 7 figures, v2: references added, typos corrected, v3 Final version published in NPB

References in corpus (41)

• The galileon as a local modification of gravity
• Astrophysical magnetic fields and nonlinear dynamo theory
• The Ekpyrotic Universe: Colliding Branes and the Origin of the Hot Big Bang
• Generalized G-inflation: Inflation with the most general second-order field equations
• Covariant Galileon
• Magnetic Fields in the Early Universe
• Origin of Galactic and Extragalactic Magnetic Fields
• Cosmic Evolution in a Cyclic Universe
• Cosmological Magnetic Fields: Their Generation, Evolution and Observation
• Generalized Galileons: All scalar models whose curved background extensions maintain second-order field equations and stress tensors
• Cluster Magnetic Fields
• A Cyclic Model of the Universe
• Inflationary Universe with Anisotropic Hair
• Ekpyrotic and Cyclic Cosmology
• The Magnetized Universe
• Gauge Fields and Inflation
• Primordial magnetogenesis
• New Ekpyrotic Cosmology
• Strong magnetic fields in normal galaxies at high redshifts
• Kasner and Mixmaster behavior in universes with equation of state w \ge 1
• Arbitrary p-form Galileons
• Evidence for Gamma-Ray Halos Around Active Galactic Nuclei and the First Measurement of Intergalactic Magnetic Fields
• The Causal Interpretation of Dust and Radiation Fluids Non-Singular Quantum Cosmologies
• Determination of intergalactic magnetic fields from gamma ray data
• A Global Probe of Cosmic Magnetic Fields to High Redshifts
• Magnetic fields in barred galaxies. IV. NGC 1097 and NGC 1365
• A Faraday Rotation Search for Magnetic Fields in Large Scale Structure
• Cosmology without inflation
• Anisotropy in a Nonsingular Bounce
• A non inflationary model with scale invariant cosmological perturbations
• CMB bispectrum from primordial magnetic fields on large angular scales
• The Cyclic Model Simplified
• Milestones in the Observations of Cosmic Magnetic Fields
• A new duality relating density perturbations in expanding and contracting Friedmann cosmologies
• Nonperturbative analysis of the evolution of cosmological perturbations through a nonsingular bounce
• An 84 microGauss Magnetic Field in a Galaxy at Redshift z=0.692
• Cosmic Microwave Background Trispectrum and Primordial Magnetic Field Limits
• Non-Gaussian features of primordial magnetic fields in power-law inflation
• A Galileon Design of Slow Expansion: II
• G-Curvaton
• Bouncing Cosmologies

Cited by in corpus (22)

• The origin, evolution and signatures of primordial magnetic fields
• Pre-reheating Magnetogenesis in the Kinetic Coupling Model
• Inflationary magnetogenesis with reheating phase from higher curvature coupling
• Bounce cosmology in generalized modified gravities
• Duality and scale invariant magnetic fields from bouncing universes
• Generation of scale invariant magnetic fields in bouncing universes
• Generation of large-scale magnetic fields, non-Gaussianity, and primordial gravitational waves in inflationary cosmology
• Effective Theory of Inflationary Magnetogenesis and Constraints on Reheating
• Primordial Gravitational Waves Induced by Magnetic Fields in an Ekpyrotic Scenario
• Inflationary magneto-(non)genesis, increasing kinetic couplings, and the strong coupling problem
• Magnetogenesis in Matter - Ekpyrotic Bouncing Cosmology
• Cross-correlations between scalar perturbations and magnetic fields in bouncing universes
• Primordial Magnetogenesis in a Bouncing Universe
• Enhance Primordial Black Hole Abundance through the Non-linear Processes around Bounce Point
• Superhorizon magnetic fields
• Large-scale gauge spectra and pseudoscalar couplings
• Smooth magnetogenesis
• Revisiting primordial magnetic fields through 21-cm physics: Bounds and forecasts
• The hypermagnetic power spectra and the phases of Sakharov oscillations
• Primordial magnetogenesis in a bouncing model with dark energy
• Primordial magnetic non-Gaussianity with generic vacua and detection prospects in CMB spectral distortions
• Primordial Magnetic Field from Gravitationally Coupled Electrodynamics in Bouncing Scenario