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Explore how gravitational waves serve as powerful tools for investigating fundamental physics in this lecture from the Graduate School "ISAPP2025: Gravitational Waves: From Theory to Detection" at the Erwin Schrödinger International Institute for Mathematics and Physics. Delve into the theoretical foundations and practical applications of gravitational wave astronomy as a probe for understanding the deepest principles governing our universe. Learn how these ripples in spacetime, first predicted by Einstein's general relativity and now routinely detected by advanced interferometers, provide unprecedented insights into fundamental physical phenomena that cannot be accessed through traditional electromagnetic observations. Discover the cutting-edge research methodologies and analytical techniques used to extract fundamental physics information from gravitational wave signals, including tests of general relativity, constraints on alternative theories of gravity, and investigations into the nature of compact objects and extreme matter states. Gain understanding of how gravitational wave detections are revolutionizing our comprehension of black holes, neutron stars, and the fundamental structure of spacetime itself, while opening new avenues for exploring physics beyond the Standard Model.
