"Heads or Tails: Black Holes, Information, and the Geometry of Spacetime"

This survey examines the deep link between information and geometry in general relativity, treating them as two sides of the same physical reality. It traces this duality through Einstein’s field equations, the cosmological constant, and black hole physics — covering the event horizon, Hawking radiation, the information paradox, and the holographic principle — to show how curvature and information converge most sharply at a black hole’s edge.