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Explore how the upcoming Gaia Data Release 4 will revolutionize our understanding of black holes in binary systems in this 45-minute conference talk by Hans-Walter Rix from the Max Planck Institute for Astronomy. Learn about the convergence of multiple astronomical detection methods that are unveiling new populations of stellar mass black holes, including gravitational wave detections, Gaia's discovery of dormant black holes in detached binaries, microlensing observations of isolated black holes, and time domain surveys capturing transient events. Discover how these complementary observational approaches are revealing black hole populations that extend far beyond the traditionally known accreting systems identified through X-ray and radio surveys. Examine the complete lifecycle of stellar black holes, from their origins as massive star progenitors through core collapse and associated transients, to their existence as dormant or accreting objects, and potentially their final fate as gravitational wave sources during mergers. Gain insights into how the astronomical community is developing new observational and theoretical strategies to address fundamental questions about stellar black hole evolution, presented as part of the Kavli Institute for Theoretical Physics conference on the lifecycle of stellar black holes.
