Cosmic voids uncovered -- first-order statistics of depressions in the biased density field

Understand

Cosmic voids are the major volume component in the matter distribution of the Universe.

• They posses great potential for constraining dark energy as well as for testing theories of gravity.
• Nevertheless, in spite of their growing popularity as cosmological probes, a gap of knowledge between cosmic void observations and theory still persists.
• In particular, the void size function models proposed in literature have been proven unsuccessful in reproducing the results obtained from cosmological simulations in which cosmic voids are detected from biased tracers of the density field, undermining the possibility of using them as cosmological probes.