General Relativity and Cosmology

This lecture covers the fundamental concepts of general relativity and cosmology, exploring topics such as the structure of the universe, gravitational lenses, black holes, and the expansion of the universe. It delves into the historical development of these theories, from Newtonian physics to Einstein's revolutionary ideas, and discusses the implications of Einstein's equations on the curvature of spacetime and the behavior of matter. The lecture also addresses the discovery of gravitational lensing, the nature of black holes, the expansion of the universe, and the composition of cosmic energy. It concludes with a reflection on dark energy and the potential role it may play in shaping our understanding of the universe.