ty in the merger rate density and mass spectrum of BBH mergers from each channel. Future observations of gravitational waves from merging BBHs will help to constrain
these uncertainties and provide valuable insights into the formation and evolution of black holes and binary star systems.</p></li>
<li><p>In particular, Einstein Telescope and Cosmic explorer, next-generation gravitational wave detectors (3G), are expected to detect a significant number of BBH mergers from all three channels. This will provide