Multi-messenger astrophysics has become a distinct discipline with the great potential to reveal new clues on the properties and processes of the physical universe. Gravitational waves provide a radical new way to study the darkest depths of the cosmos, black holes. With the first three observing runs performed by LIGO, Virgo and KAGRA we are now capable of performing population studies revealing the first identification of intermediate-mass black holes. These sources are of particular interest since they may hold the key to one of the big puzzles in astrophysics and cosmology: the origin and evolution of supermassive black holes. As extraordinary as the past few years of discoveries have been, they have only revealed the tip of the iceberg and in order to gather a complete understanding of the life cyle of these enigmatic objects we need to rely on the multi-messenger approach and combine the observations from Pulsar Timing Arrays, neutrinos, and electromagnetic observatories. The goal of the third edition of the Gravi-Gamma workshop is to bring together experts in the fields of observational and theoretical multi-messenger science to explore the black hole life cycle.

This workshop is funded by a grant from the Italian Ministry of Foreign Affairs and International Cooperation. This event is also supported by AHEAD2020, funded by the Horizon 2020 Framework Programme of the European Union, GA No. 871158