Simulating the Primordial Black Hole Binaries Formed in Dark Matter Halos*

Primordial Black Holes (PBHs) might be responsible for a number of gravitational-wave events detected by LIGO, possibly constituting a significant fraction of dark matter. By modifying "Rapster", a semi analytic code for rapid population synthesis of binary black-hole mergers in environments rich in dynamic interactions, we simulate the formation and evolution of PBH binaries within dark matter halos. We focus on their merger properties such as mass and spin. Assuming that dark matter halos are only made of PBHs, we highlight how halo characteristics such as concentration and scale radius might affect binary formation and mergers. We compare our findings with BBHs formed in dense environments, such as globular and nuclear star clusters, revealing their distinct properties. Our work provides important insights into the dynamics of PBHs in dark matter halos, advancing our understanding of gravitational-wave events detected in LIGO.