Astronomy and Astrophysics – Astrophysics
Scientific paper
1996-02-07
Phys.Rev. D54 (1996) 1291-1300
Astronomy and Astrophysics
Astrophysics
10 pages uuencoded LATeX, 4 figures included
Scientific paper
10.1103/PhysRevD.54.1291
We investigate hydromagnetic turbulence of primordial magnetic fields using magnetohydrodynamics (MHD) in an expanding universe. We present the basic, covariant MHD equations, find solutions for MHD waves in the early universe, and investigate the equations numerically for random magnetic fields in two spatial dimensions. We find the formation of magnetic structures at larger and larger scales as time goes on. In three dimensions we use a cascade (shell) model, that has been rather successful in the study of certain aspects of hydrodynamic turbulence. Using such a model we find that after ${\cal O}(10^9)$ times the initial time the scale of the magnetic field fluctuation (in the comoving frame) has increased by 4-5 orders of magnitude as a consequence of an inverse cascade effect (i.e. transfer of energy from smaller to larger scales). Thus {\it at large scales} primordial magnetic fields are considerably stronger than expected from considerations which do not take into account the effects of MHD turbulence.
Brandenburg Axel
Enqvist Kari
Olesen Poul
No associations
LandOfFree
Large-scale magnetic fields from hydromagnetic turbulence in the very early universe does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Large-scale magnetic fields from hydromagnetic turbulence in the very early universe, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Large-scale magnetic fields from hydromagnetic turbulence in the very early universe will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-377550