The Kelvin-Helmholtz Instability in an Expanding Universe and its Effect on Dark Matter

Details The Kelvin-Helmholtz Instability in an Expanding Universe and its Effect on Dark Matter The Kelvin-Helmholtz Instability in an Expanding Universe and its Effect on Dark Matter

2002-08-14

arxiv.org/abs/astro-ph/0208272v3

Astron.Astrophys. 406 (2003) 37

Astronomy and Astrophysics

Astrophysics

5 pages, 1 figure. v2 extended to cover density perturbations and now applies to both compressible and incompressible irrotati

Scientific paper

10.1051/0004-6361:20030778

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.

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