Redshift-space effects in voids and their impact on cosmological tests. Part I: the void size function

Understand

Voids are promising cosmological probes.

• Nevertheless, every cosmological test based on voids must necessarily employ methods to identify them in redshift space.
• Therefore, redshift-space distortions (RSD) and the Alcock-Paczynski effect (AP) have an impact on the void identification process itself generating distortion patterns in observations.
• Using a spherical void finder, we developed a statistical and theoretical framework to describe physically the connection between the identification in real and redshift space.