Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2011-12-28
Phys.Rev.D85:063514,2012
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
Minor changes. References added and updated. Published version
Scientific paper
We study the role of viscosity and the effects of a magnetic field on a rotating, self-gravitating fluid, using Newtonian theory and adopting the ideal magnetohydrodynamic approximation. Our results confirm that viscosity can generate vorticity in inhomogeneous environments, while the magnetic tension can produce vorticity even in the absence of fluid pressure and density gradients. Linearizing our equations around an Einstein-de Sitter cosmology, we find that viscosity adds to the diluting effect of the universal expansion. Typically, however, the dissipative viscous effects are confined to relatively small scales. We also identify the characteristic length bellow which the viscous dissipation is strong and beyond which viscosity is essentially negligible. In contrast, magnetism seems to favor cosmic rotation. The magnetic presence is found to slow down the standard decay-rate of linear vortices, thus leading to universes with more residual rotation than generally anticipated.
Brandenburg Axel
Dosopoulou F.
Sordo Fabio Del
Tsagas Christos G.
No associations
LandOfFree
Vorticity production and survival in viscous and magnetized cosmologies 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 Vorticity production and survival in viscous and magnetized cosmologies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Vorticity production and survival in viscous and magnetized cosmologies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-32749