Event Details

High frequency gravitational waves are motivated by many primordial cosmology phenomena. In this talk, I will discuss the connection between high frequency gravitational waves and light primordial black holes in the early universe. Primordial black holes can generate the dark matter relic abundance and the baryon asymmetry with their Hawking radiation, which provides a portal to the beyond Standard Model sector. However, light black holes completely evaporated away before Big Bang Nucleosynthesis may leave no observable traces in the late universe, making it difficult to test these mechanisms. This talk proposes that MHz-GHz gravitational waves could be a new channel to probe the existence of such black holes, using examples of two formation mechanisms: primordial curvature fluctuation and first order phase transition. Finally, I will discuss prospects for detection in the high frequency gravitational wave frontier.