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Explore the cutting-edge physics of black hole stability and ultracompact objects in this 59-minute astrophysics colloquium from the Institute for Advanced Study. Delve into how recent gravitational wave and electromagnetic observations have revolutionized our understanding of black holes and extreme gravity phenomena. Examine the paradoxical nature of black holes as both stable endpoints of gravitational collapse and objects teetering on the edge of instability, with their event horizons serving as crucial stabilizing mechanisms. Investigate how ultracompact objects without horizons develop new types of instabilities and learn about the latest insights into their evolutionary outcomes. Discover how the stability of rotating black holes depends on the existence of ultralight fields, making these cosmic giants potential detectors for dark matter particles. Understand the nonlinear development of gravitational instabilities and how this knowledge enables scientists to use strong gravity observations to test fundamental black hole physics and search for new particles in the universe.
