  The Zeldovich approximation, 1st order Lagrangian perturbation theory,
provides a good description of the clustering of matter and galaxies on large
scales. The acoustic feature in the large-scale correlation function of
galaxies imprinted by sound waves in the early Universe has been successfully
used as a `standard ruler' to constrain the expansion history of the Universe.
The standard ruler can be improved if a process known as density field
reconstruction is employed. In this paper we develop the Zeldovich formalism to
compute the correlation function of biased tracers in both real- and
redshift-space using the simplest reconstruction algorithm with a Gaussian
kernel and compare to N-body simulations. The model qualitatively describes the
effects of reconstruction on the simulations, though its quantitative success
depends upon how redshift-space distortions are handled in the reconstruction
algorithm.
