Precision cosmology with voids: definition, methods, dynamics

Understand

We propose a new definition of cosmic voids based on methods of Lagrangian orbit reconstruction as well as an algorithm to find them in actual data called DIVA.

• Our technique is intended to yield results which can be modeled sufficiently accurately to create a new probe of precision cosmology.
• We then develop an analytical model of the ellipticity of voids found by our method based on Zel'dovich approximation.
• We measure in N-body simulation that this model is precise at the 0.1% level for the mean ellipticity of voids of size greater than ~4 Mpc/h.