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Domain walls (DWs) are topological defects originating from phase transitionsin the early universe. In the presence of an energy imbalance between distinctvacua, enclosed DW cavities shrink until the entire network disappears. Bystudying the dynamics of thin-shell bubbles in General Relativity, wedemonstrate that closed DWs with sizes exceeding the cosmic horizon tend toannihilate later than the average. This delayed annihilation allows for theformation of large overdensities, which, upon entering the Hubble horizon,eventually collapse to form Primordial Black Holes (PBHs). We rely on 3Dpercolation theory to calculate the number density of these late-annihilatingDWs, enabling us to infer the abundance of PBHs. A key insight from our studyis that DW networks with the potential to emit observable Gravitational Wavesare also likely to yield detectable PBHs. Additionally, we study the productionof wormholes connected to baby-universes and conclude on the possibility togenerate a multiverse.

Primordial Black Holes and Wormholes from Domain Wall Networks