Title: Black Holes as Discovery Channels for New Particles

Abstract: The extreme environments near black holes (BHs) offer unique opportunities to probe fundamental physics. These regions can host extraordinarily high particle densities, effectively turning BHs into natural concentrators of new physics. Notable examples include the superradiant amplification of ultralight bosons, which can reach near–Planck-scale field strengths, and the adiabatic growth of dark matter density spikes. Such enhancements can greatly amplify observational signatures relevant to BH studies, from black hole images captured by the Event Horizon Telescope to gravitational-wave backgrounds detected by Pulsar Timing Arrays. Moreover, dense bosonic backgrounds around BHs can trigger phenomena previously considered only in early-universe cosmology, such as parametric particle production, opening new avenues for discovery.

https://lbnl.zoom.us/j/94928022788?pwd=emVQWG1mTnhSbHVqekVuenk0VEVQZz09