Massive black holes interactions during the assembly of heavy
  sub-structures in the centre of galaxy clusters
  We performed a series of direct N-body simulations with the aim to follow the
dynamical evolution of a galaxy cluster (GC) ($M_{clus}\simeq 10^{14}
M_{\odot}$) in different environment. The results show the formation of heavy
sub-structures in the cluster centre in consequence of multiple merging among
the innermost galaxies. Moreover we investigate the dynamics of super-massive
black holes (SMBHs) residing in the centre of galaxies that form the most
massive sub-structure.
