Cosmic strings and primordial black holes

Understand

Cosmic strings and primordial black holes (PBHs) commonly and naturally form in many scenarios describing the early universe.

• Here we show that if both cosmic strings and PBHs are present, their interaction leads to a range of interesting consequences.
• At the time of their formation, the PBHs get attached to the strings and influence their evolution, leading to the formation of black-hole-string networks and commonly to the suppression of loop production in a range of redshifts.
• Subsequently, reconnections within the network give rise to small nets made of several black holes and connecting strings.