Class Notes for PHY33: Cosmology and Black Holes
(called Topics in String Theory in the schedule)
The Theoretical Minimum Class Series
Professor Leonard Susskind
Wrap up lecture for last quarter’s String Theory topic.
Light Paths, Metric of Black Hole, Entropy of Black Hole
The black hole metric near the horizon, the temperature and lifetime of black holes
Visualizing the metric around a black hole, the singularity, Penrose diagrams, Birkhoff’s theorem
Building a black hole and the Penrose diagram for the process. The temperature of a black hole observed near the horizon. Quantum limits on measuring the temperature of an object in free fall at the horizon.
The degrees of freedom on the horizon, the entropy of a string vs. the entropy of a black hole.
String configurations, resolving the entropy of strings with the entropy of black holes, an expanding universe has horizons too, De Sitter space.
The expanding universe and energy density scaling, horizons in de Sitter space. The universe will be a lonely place in a few billion years.
Cosmic horizons, how vacuum energy drives inflation, Poincaré recurrence, eternal inflation, the measure problem.