Gravitational waves from the merger of two primordial black hole clusters

Understand

The orbital evolution of a binary system consisting of two primordial black hole clusters is investigated.

• Such clusters are predicted in some theoretical models with broken symmetry in the inflation Lagrangian.
• A cluster consists of the most massive central black hole surrounded by many smaller black holes.
• Similar to single primordial black holes, clusters can form gravitationally bounded pairs and merge during their orbital evolution.