Anomalous Global Strings and Primordial Magnetic Fields

Abstract

We propose a new mechanism for the generation of primordial magnetic fields, making use of the magnetic fields which are induced by anomalous global strings which couple to electromagnetism via Wess-Zumino type interactions. This mechanism can be realized in QCD by utilizing pion strings, global vortices which appear in the linear sigma model which describes physics below the QCD confinement scale. During the chiral symmetry breaking phase transition, pion strings can be produced, thus leading to primordial magnetic fields. We calculate the magnitude and coherence length of these fields. They are seen to depend on the string dynamics. With optimistic assumptions, both the magnitude and coherence scale of the induced magnetic fields can be large enough to explain the seed magnetic fields of greater than $10^{-23}$ Gauss necessary to produce the observed galactic magnetic fields via the galactic dynamo mechanism.

6 pages, REVTEX format, short discussion of plasma effects added

References in corpus (9)

• Primordial Magnetic Fields, Right Electrons, and the Abelian Anomaly
• Primordial Magnetic Fields
• Magnetic field generation in first order phase transition bubble collisions
• Pion and Eta Strings
• Primordial Magnetic Fields from Superconducting Cosmic Strings
• Origin of Magnetic Fields in the Universe Due to Nonminimal Gravitational-Electromagnetic Coupling
• A Mechanism for Baryogenesis in Low Energy Supersymmetry Breaking Models
• Magnetic Fields in the Early Universe
• Primordial Magnetic Fields that Last?

Cited by in corpus (31)

• Primordial magnetogenesis
• Vortices and Other Topological Solitons in Dense Quark Matter
• Inflation and Brane Gases
• Searching for Cosmic Strings in New Observational Windows
• Interactions of Non-Abelian Global Strings
• Intermediate Mass Black Hole Seeds from Cosmic String Loops
• Challenges for creating magnetic fields by cosmic defects
• Stabilization of the Electroweak Z String in the Early Universe
• Non-Abelian Global Strings at Chiral Phase Transition
• Non-Abelian Global Vortices
• Thermal Stabilisation of Superconducting Sigma Strings and their Drum Vortons
• Non-abelian Topological Strings and Metastable States in Linear Sigma Model
• Inflationary magneto-(non)genesis, increasing kinetic couplings, and the strong coupling problem
• Primordial magnetic fields generated by the non-adiabatic fluctuations at pre-recombination era
• Reduced bispectrum seeded by helical primordial magnetic fields
• Note on Structure Formation from Cosmic String Wakes
• General relativistic density perturbations
• A phase of confined electroweak force in the early Universe
• Effects of a Thermal Bath of Photons on Embedded String Stability
• Signal of the pion string at high-energy collisions
• Embedded Domain Walls and Electroweak Baryogenesis
• Primordial magnetic seeds from string cosmology
• Magnetohydrodynamics in the Inflationary Universe
• Pion String evolving in a thermal bath
• Stability of the pion string in a thermal and dense medium
• Domain Wall in the Linear Sigma Model
• String melting in a photon bath
• Cosmological Symmetry Breaking and Generation of Electromagnetic Field
• Galactic dynamo seeds from non-superconducting spin-polarised strings
• Baryon production from embedded metastable strings
• PhD Thesis: String theory in the early universe