The sparkling Universe: a scenario for cosmic void motions

Understand

We perform a statistical study of the global motion of cosmic voids using both a numerical simulation and observational data.

• We analyse their relation to large-scale mass flows and the physical effects that drive those motions.
• We analyse the bulk motions of voids, defined by the mean velocity of haloes in the surrounding shells in the numerical simulation, and by galaxies in the Sloan Digital Sky Survey Data Release 7.
• We find void mean bulk velocities close to 400 km/s, comparable to those of haloes (~ 500-600 km/s), depending on void size and the large-scale environment.