Void Replenishment: How Voids Accrete Matter Over Cosmic History

Cosmic voids are underdense regions filling up most of the volume in universe. They expected to emerge comprising negative initial density fluctuations, and subsequently expand as matter around them collapses forms walls, filaments, clusters. We report results from analysis a cosmological simulation specially designed accurately describe low-density regions, such cosmic voids. Contrary common expectation, we find that also experience significant mass inflows over history. On average, 10% sample at z ∼ 0 is accreted overdense reaching values beyond 35% for fraction More than half entering lingers on periods time ∼10 Gyr well inside them, inner radii. This would imply part gas lying given proceeds (e.g., clusters or filaments), where it could have been preprocessed, thus challenging scenario galaxy formation voids, dissenting idea being pristine environments.