The detection of gravitational waves (GWs) with ground-based interferometers opened a revolutionary vista on the Universe, upending our notions about the origin of stellar-mass black holes, and offering a spectacular multimessenger view of a binary neutron-star merger and of the ensuing radiation across the electromagnetic band. From a fundamental-physics standpoint, GWs provide experimental access to the strong-field regime of general relativity and to precision tests of modified gravity. This whirlwind tour of GW science is meant to give theoretical physicists and non-GW astrophysicists an appreciation of current topics of GW research, as well as an entry point to connect their work with GW applications or observations. The five lectures will cover: GW propagation and detection GW generation and waveform models Astrophysical GW sources, with focus on the LIGO-Virgo catalog GW data analysis, with focus on tests of GR Cosmology and cosmography with GWs Livestream on youtube.com/IPhT-TV: no subscription required Videoconference: subscribe to the course newsletter on the website to receive links courses page : https://courses.ipht.fr/?q=en/node/249

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