Evolution of magnetic fields in cosmic string wakes

The Structure of Cosmic String Wakes

The clustering of baryons and cold dark matter induced by a single moving string is analyzed numerically, making use of the new three-dimensional Eulerian cosmological hydrocode of Sornborger et al., which uses the piecewise parabolic method to track the baryons and the particle-in-cell method to evolve the dark matter particles. A long straight string moving with a speed comparable to c induce...

Evolution of cosmic string configurations.

We extend and develop our previous work on the evolution of a network of cosmic strings. The new treatment is based on an analysis of the probability distribution of the end-to-end distance, or extension, of a randomly chosen segment of left-moving string of given length. The description involves three distinct length scales: ξ, related to the overall string density, ¯ ξ, the persistence length...

Cosmic Magnetic Fields

Damping of Cosmic Magnetic Fields

We examine the evolution of magnetic fields in an expanding fluid composed of matter and radiation with particular interest in the evolution of cosmic magnetic fields. We derive the propagation velocities and damping rates for relativistic and non-relativistic fast and slow magnetosonic, and Alfvén waves in the presence of viscous and heat conducting processes. The analysis covers all MHD modes...

Cosmic string formation from correlated fields

We simulate the formation of cosmic strings at the zeros of a complex Gaussian field with a power spectrum P (k) ∝ k, specifically addressing the issue of the fraction of length in infinite strings. We make two improvements over previous simulations: we include a non-zero random background field in our box to simulate the effect of long-wavelength modes, and we examine the effects of smoothing ...