This is highly influential in astrophysics for understanding how galaxies and large-scale structures formed and grew in the universe! The Massively Accreting Cluster A2029 - OSTI.GOV
The authors found that the merger rate per unit redshift is nearly universal and independent of redshift, scaling simply with halo mass and mass ratio.
It utilizes the massive public database of the Millennium Simulation to track merger trees over a wide dynamic range in time and mass.