A bstract We study the formation of primordial black holes (PBHs) in strongly super-cooled first-order phase transitions. The mechanism is based on presence remnants dominated by false vacuum that scale slower with expansion Universe than their surroundings where this energy was already converted into radiation. compute PBH from these including contribution and bubble walls, estimating collapse using hoop conjecture considering both regions collapsing immediately when entering horizon...

Slow first-order phase transitions generate large inhomogeneities that can lead to the formation of primordial black holes. We show gravitational wave spectrum then consists a primary component sourced by bubble collisions and secondary one induced perturbations. The latter gives dominant peak if β/H_{0}<12, impacting, in particular, interpretation recent pulsar timing array data. signal associated with particular hole population is stronger than typical scenarios because negative...

Slow first-order phase transitions generate large inhomogeneities that can lead to the formation of primordial black holes (PBHs). We show gravitational wave (GW) spectrum then consists a primary component sourced by bubble collisions and secondary one induced perturbations. The latter gives dominant peak if $\beta/H_0 < 10$, impacting, in particular, interpretation recent PTA data. GW signal associated with particular PBH population is stronger than typical scenarios because negative...

We study realistic models predicting primordial black hole (PBH) formation from density fluctuations generated in a first-order phase transition. show that the second-order correction expansion of bubble nucleation rate is necessary for accurate predictions and quantify its impact on abundance PBHs gravitational waves (GWs). find distribution becomes more Gaussian as term increases. Consequently, predict same PBH abundances can produce different GW spectra.

We study the formation of primordial black holes (PBHs) in strongly supercooled first-order phase transitions. The mechanism is based on presence remnants dominated by false vacuum that scale slower with expansion Universe than their surroundings where this energy was already converted into radiation. compute PBH from these including contribution and bubble walls, estimating collapse using hoop conjecture considering both regions collapsing immediately when entering horizon sub-horizon as...