Introduction

We study some of the most energetic phenomena in the Universe — colliding black holes and neutron stars, merging supermassive black holes and galaxies, gamma ray-bursts and relativistic jets, spinning neutron stars and exploding stars, and even the birth of the Universe itself.

Most of these phenomena are very powerful sources of gravitational waves, electromagnetic radiation, high-energy particles, which are central to the new field of multi-messenger astrophysics!