Cosmological Magnetic Fields

Abstract

Magnetic fields are observed on nearly all scales in the universe, from stars and galaxies upto galaxy clusters and even beyond. The origin of cosmic magnetic fields is still an open question, however a large class of models puts its origin in the very early universe. A magnetic dynamo amplifying an initial seed magnetic field could explain the present day strength of the galactic magnetic field. However, it is still an open problem how and when this initial magnetic field was created. Observations of the cosmic microwave background (CMB) provide a window to the early universe and might therefore be able to tell us whether cosmic magnetic fields are of primordial, cosmological origin and at the same time constrain its parameters. We will give an overview of the observational evidence of large scale magnetic fields, describe generation mechanisms of primordial magnetic fields and possible imprints in the CMB.

8 pages. EPS-Invited talk at the 40th EPS Conference on Plasma Physics, Espoo, Finland, July 1-5, 2013. Submitted to Plasma Physics and Controlled Fusion

References in corpus (9)

• On the Origin of Cosmic Magnetic Fields
• The anisotropic power spectrum and bispectrum in the f(phi) F^2 mechanism
• A Global Probe of Cosmic Magnetic Fields to High Redshifts
• Constraints on the Evolution of the Primordial Magnetic Field from the Small-Scale Cosmic Microwave Background Angular Anisotropy
• CMB anisotropies in the presence of a stochastic magnetic field
• Slow decay of magnetic fields in open Friedmann universes
• Completing magnetic field generation from gravitationally coupled electrodynamics with the curvaton mechanism
• Magnetic fields in our Milky Way Galaxy and nearby galaxies
• Magnetic Fields in Clusters of Galaxies

Cited by in corpus (17)

• Bouncing Cosmologies: Progress and Problems
• Planck 2015 results. XIX. Constraints on primordial magnetic fields
• Falsifying cosmological models based on a non-linear electrodynamics
• Inflation and Acceleration of the Universe by Nonlinear Magnetic Monopole Fields
• Inflation Driven by Non-Linear Electrodynamics
• Cosmology with variable $G$ and nonlinear electrodynamics
• The amplification of cosmological magnetic fields in Extended $f(T,B)$ Teleparallel Gravity
• A Holographic Bound on Cosmic Magnetic Fields
• Torsion driven Inflationary Magnetogenesis
• Magnetic Fields in an Expanding Universe
• Diamagnetic field states in cosmological plasmas
• Inflationary cosmology- A new approach using Non-linear electrodynamics
• Propagators of charged particles in an external magnetic field, expanded over Landau levels
• Non-linear Electrodynamics in Blandford-Znajeck Energy Extraction
• Ill-posedness of the mean-field dynamo equations with a linear electromotive force
• Black bounces as magnetically charged phantom regular black holes in Einstein-nonlinear electrodynamics gravity coupled to a self-interacting scalar field
• Primordial magnetic fields in theories of gravity with non-minimal coupling between curvature and matter