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The multitude of binary black hole coalescence detections in gravitationalwaves has renewed our interest on environments that can be the cradle of thesemergers. In this work we study merger rates of binary black holes in globularclusters that are among the most dense stellar environments and a natural placefor the creation of black hole binaries. To model these systems with all theirvariations we rely on the observational properties of the known Milky Wayglobular clusters. We consider direct capture events between black holes, aswell as soft interactions of black hole binaries with stars as third bodiesthat accelerate the evolution of these binaries. We find that binary blackholes from direct captures merge at an averaged rate of $0.3-5 \times 10^{-11}$yr$^{-1}$ per cluster. Third body soft interactions are a much more prominentchannel giving an averaged rate of $2-4 \times 10^{-10}$ yr$^{-1}$ per cluster.Those rates in globular clusters can lead to a cumulative merger rate of about100 mergers per year up to redshift of 1, i.e. a significant fraction of thedetectable in the near future binary black hole coalescence events. Furtherobservations of cluster properties both in terms of their masses, profileproperties, velocity dispersion of stars and their cosmological distribution,will allow us to better constrain the contribution of these environments to thedetectable coalescence events rate.

Evaluating the Merger Rate of Binary Black Holes from Direct Captures and Third-Body Soft Interactions Using the Milky Way Globular Clusters