A Zeldovich reconstruction method for measuring redshift space distortions using cosmic voids

Understand

Redshift space distortions (RSD) in the void-galaxy correlation $\xi^s$ provide information on the linear growth rate of structure in low density environments.

• Accurate modelling of these RSD effects can also allow the use of voids in competitive Alcock-Paczynski measurements.
• Linear theory models of $\xi^s$ are able to provide extremely good descriptions of simulation data on all scales provided the real space void positions are known.
• However, by reference to simulation data we demonstrate the failure of the assumptions implicit in current models of $\xi^s$ for voids identified directly in redshift space, as would be simplest using real observational data.