Redshift-Space versus Real Space: A Dynamical Probe of Fundamental Cosmological Parameters
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**Session 29 -- The Dynamics of Large Scale Structure**
*Oral presentation, Tuesday, June 13, 1995, 2:00pm - 5:30pm*

## [29.04] Redshift-Space versus Real Space: A Dynamical Probe of Fundamental Cosmological Parameters

*Karl B. Fisher (Institute for Advanced Study)*

Historically, redshift surveys have provided the raw data
and impetus for much of the research into the nature of
the three dimensional galaxy distribution. The distribution
of galaxy redshifts can, however, be systematically different
from the distribution of actual galaxy distances.
Redshift-space is a projection of the full six-dimensional
phase space describing the positions and velocities of the
galaxies. Consequently, the difference between
clustering in real and redshift-space offers a invaluable
dynamical probe of the relationship between the density
and velocity fields. The dynamical mapping between the
density field in real and redshift-space will be discussed
in the context of linear and non-linear gravitational instability theory.
A few examples will illustrate how
modeling the distortion of the clustering pattern in the
next generation of large redshift surveys, such as the
planned Sloan Digital Sky Survey, offers the promise
of high-precision determinations of fundamental cosmological parameters,
such a the mean mass density of the universe, $\Omega$.

**Tuesday
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