Development of cosmological perturbations against a background of large-scale inhomogeneities

Details Development of cosmological perturbations against a background of large-scale inhomogeneities Development of cosmological perturbations against a background of large-scale inhomogeneities

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993arep...37..329n&link_type=abstract

Astronomy Reports, Volume 37, Issue 4, July 1993, pp.329-333

Astronomy and Astrophysics

Astronomy

Scientific paper

We solve the equations for the evolution of small-scale linear perturbations against the background of a spherically symmetric inhomogeneity with an arbitrary density distribution. We show that the growth rate of density perturbations is enhanced in comparison with perturbations against a critical background. At the stopping time for a homogeneous background with {OMEGA} > 1, the perturbation amplitude is three times that for a flat Friedmann background. In the problem of the formation of galaxies, the effect is important in models with a spectrum containing a higher intensity at the scales of clusters and larger, and it may be responsible for the fragmentation of a large-scale perturbation into smaller-scale objects.

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