Multimessenger Astrophysics: An Introduction

Multimessenger astrophysics seeks to understand the Universe through the combined observation of electromagnetic radiation, gravitational waves, and other cosmic messengers. While the concept is deceptively simple, transforming these observations into physical insight requires an extraordinary breadth of expertise. Progress in this field depends on the close interplay of particle physics, fluid dynamics, nuclear and atomic physics, astrophysics, cosmology, gravitational physics, and advanced computational methods.

In this introductory talk, I will survey the currently available multimessenger observables and outline how they are used to probe extreme astrophysical environments. This overview will set the stage for the subsequent presentations, which will explore end-to-end modeling and the diagnostic tools needed to fully exploit current and future multimessenger observations.