Contribution of Peculiar Shear Motions to LargeScale Structure
Abstract
Selfgravitating shear flow instability simulations in a cold dark matterdominated expanding Einsteinde Sitter universe have been performed. When the shear flow speed exceeds a certain threshold, self gravitating KelvinHelmholtz instability occurs, forming density voids and excesses along the shear flow layer which serve as seeds for large scale structure formation. A possible mechanism for generating shear peculiar motions are velocity fluctuations induced by the density perturbations of the postinflation era. In this scenario, short scales grow earlier than large scales. A model of this kind may contribute to the cellular structure of the luminous mass distribution in the universe.
 Publication:

The Astrophysical Journal
 Pub Date:
 May 1994
 DOI:
 10.1086/187351
 Bibcode:
 1994ApJ...427L...5M
 Keywords:

 Astronomical Models;
 Dark Matter;
 Gravitational Fields;
 KelvinHelmholtz Instability;
 Shear Flow;
 Density Distribution;
 Euler Equations Of Motion;
 Expansion;
 Poisson Equation;
 Variations;
 Velocity;
 Astrophysics;
 GRAVITATION;
 COSMOLOGY: LARGESCALE STRUCTURE OF UNIVERSE