Change search
ReferencesLink to record
Permanent link

Direct link
Vorticity production and survival in viscous and magnetized cosmologies
Stockholm University, Faculty of Science, Department of Astronomy.
Stockholm University, Faculty of Science, Department of Astronomy.
2012 (English)In: Physical Review D, ISSN 1550-7998, Vol. 85, no 6, 063514- p.Article in journal (Refereed) Published
Abstract [en]

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 below 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.

Place, publisher, year, edition, pages
2012. Vol. 85, no 6, 063514- p.
National Category
Physical Sciences
URN: urn:nbn:se:su:diva-76131DOI: 10.1103/PhysRevD.85.063514ISI: 000301773100001OAI: diva2:526129
4Available from: 2012-05-10 Created: 2012-05-09 Last updated: 2012-05-10Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Del Sordo, FabioBrandenburg, Axel
By organisation
Department of Astronomy
In the same journal
Physical Review D
Physical Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 14 hits
ReferencesLink to record
Permanent link

Direct link