Velocity differences as a probe of non-Gaussian density fields

Abstract:

We examine the multipoint linear velocity field for non-Gaussian models as a probe of non-Gaussian behavior. The two-point velocity correlation is not a useful indicator of a non-Gaussian density field, since it depends only on the power spectrum, even for non-Gaussian models. However, we show that the distribution of velocity differences υ1-υ2, where υ1 and υ2 are measured at the points r1 and r2, respectively, is a good probe of non-Gaussian behavior, in that P(υ1-υ2) tends to be non-Gaussian when the density field is non-Gaussian. As an example, we examine the behavior of p(υ1-υ2) for non-Gaussian seed models, in which the density field is the convolution of a distribution of points with a set of density profiles. We apply these results to the global texture model.

Año de publicación:

1995

Keywords:

• Galaxies: clusters: general
• Cosmology: theory
• Galaxies: distances and redshifts
• Large-scale structure of universe

Fuente:

scopus