MHD inverse cascade in the early Universe

Details MHD inverse cascade in the early Universe MHD inverse cascade in the early Universe

2002-01-29

arxiv.org/abs/astro-ph/0201466v1

Astronomy and Astrophysics

Astrophysics

Talk presented at COSMO-01, Rovaniemi, Finland, August 29 -- September 4, 2001

Scientific paper

We have carried out numerical simulations of freely decaying magnetohydrodynamic (MHD) turbulence in three dimensions, which can be applied to the evolution of stochastic magnetic fields in the early Universe. For helical magnetic fields an inverse cascade effect is observed in which magnetic helicity and energy is transfered from smaller scales to larger scales, accompanied by power law growth in the characteristic length scale of the magnetic field. The magnetic field quickly reaches a scaling regime with self-similar evolution, and power law behaviour at high wavenumbers. We also find power law decay in the magnetic and kinematic energies.

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