LISA's role in time-domain and multi-messenger astronomy

The Galactic population of double stellar remnants will be the largest source class, by number, for LISA as well as potentially the largest noise source at frequencies below 1 mHz. Double white dwarf binaries make up the vast majority of the population and are flagship multi-messenger sources, observable both with electromagnetic (EM) light and gravitational waves (GWs). Binaries containing neutron stars and black holes will also be observed both in and outside of the Galaxy. In the years preceding LISA's launch, ground-based GW detectors will discover hundreds more double-compact-object mergers, while EM surveys continue to discover binaries containing compact objects and their progenitors. These rich datasets, combined with theoretical modeling of the formation pathways which produce them, will pave the way to a fully realized time-domain and multi-messenger catalog in the 2030s. In this talk, I will give an overview of a selection of science cases that will be made possible by combining LISA's GW observations with ground-based GW detections and EM observations.