Contribution of peculiar shear motions to large-scale structure

Details Contribution of peculiar shear motions to large-scale structure Contribution of peculiar shear motions to large-scale structure

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...427l...5m&link_type=abstract

Astrophysical Journal, Part 2 - Letters, vol. 427, no. 1, p. L5-L8

Astronomy and Astrophysics

Astrophysics

Astronomical Models, Dark Matter, Gravitational Fields, Kelvin-Helmholtz Instability, Shear Flow, Density Distribution, Euler Equations Of Motion, Expansion, Poisson Equation, Variations, Velocity

Scientific paper

Self-gravitating shear flow instability simulations in a cold dark matter-dominated expanding Einstein-de Sitter universe have been performed. When the shear flow speed exceeds a certain threshold, self-gravitating Kelvin-Helmoholtz 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.

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