Intermediate mass black hole seeds from cosmic string loops

Doubly peaked induced stochastic gravitational wave background: testing baryogenesis from primordial black holes

“…In the early radiation domination (eRD) PBHs can form through various mechanisms: due to the amplified scalar curvature perturbation from ultra slow roll models of inflation [60][61][62][63][64][65], warm inflation [66], the first-order phase transitions [67][68][69][70][71][72][73][74][75], the collapse of topological defects [76][77][78][79][80][81][82], due to the dynamics of scalar condensates [83,84], resonant reheating [85], tachyonic preheating [86,87] etc. Large amplitude of scalar perturbations required for PBH formation, also amplify the tensor perturbation at second order and lead to detectable induced stochastic gravitational wave background (ISGWB) [88][89][90].The effects of different reheating histories for the ISGWB have also been studied extensively [91][92][93].…”

Detailed Calculation of Primordial Black Hole Formation During First-Order Cosmological Phase Transitions

“…These mechanisms offer an interesting alternative to PBH production via the more widely studied collapse of density perturbations created during inflation [76][77][78][79][80][81][82], a mechanism that requires special, in particular very flat, inflaton potentials. Other proposed PBH production mechanisms include the collapse of topological defects [83][84][85][86][87][88][89] or scalar condensates [90,91], as well as collisions of bubble walls during a first-order phase transition [92][93][94][95][96][97][98].…”

Primordial Black Holes from First-Order Cosmological Phase Transitions

“…Depending on the time at which they form, PBHs can have almost any mass, and could solve a number of problems in cosmology: most importantly, they could constitute all or part of the dark matter (DM) [5,7,8,10], they could create other DM particles when they evaporate [11][12][13][14][15][16][17][18][19][20][21][22], change the expansion history of the Universe [17,23], remove unwanted monopoles or domain walls from the Universe [24,25], or provide seeds for the supermassive black holes observed at the centre of galaxies [26] or for large scale structure formation [9,[27][28][29][30]. There are several possible production mechanisms of PBHs: the most widely studied is collapse of density perturbations generated during inflation [31][32][33][34][35][36], while the collapse of topological defects [37][38][39][40][41][42], the dynamics of scalar condensates [43,44], or collisions of bubble walls during a first-order phase transition [45][46][47]…”