Volume 406, Number 1, July IV 2003
|Page(s)||37 - 41|
|Section||Cosmology (including clusters of galaxies)|
|Published online||17 November 2003|
The Kelvin-Helmholtz instability in an expanding universe and its effect on dark matter
GRECO, Institut d'Astrophysique de Paris, CNRS, 98bis Boulevard Arago, 75014 Paris, France
2 Institute of Cosmology and Gravitation, University of Portsmouth, Portsmouth PO1 2EG, UK
Corresponding author: K. A. Malik, firstname.lastname@example.org
Accepted: 12 May 2003
We extend the Kelvin-Helmholtz instability to an expanding background. We study the evolution of a non-viscous irrotational fluid and find that for wavelengths much smaller than the Hubble scale small perturbations of the fluid are unstable for wavenumbers larger than a critical value. We then apply this result in the early universe, treating cold dark matter as a classical fluid with vanishing background pressure.
Key words: instabilities / cosmology: theory / cosmology: dark matter
© ESO, 2003
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.