Bard College
Talks by Hal Haggard
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PSI 2018/2019  Explorations in Quantum Gravity  Lecture 14

Hal Haggard Bard College
Brief introduction to gravitational wave detection
Quantum gravity and black hole spin in gravitational wave observations: a test of the BekensteinHawking entropy
Black hole entropy is a robust prediction of quantum gravity with no observational test to date. We use the BekensteinHawking entropy formula to determine the probability distribution of the spin of black holes at equilibrium in the microcanonical ensemble. We argue that this ensemble is relevant for black holes formed in the early universe and predicts the existence of a population of black holes with zero spin.
Complex Quantum Tunneling, PicardLefschetz Theory, and the Decay of Black Holes
Quantum effects render black holes unstable. In addition to Hawking radiation, which leads to the prediction of a long lifetime, there is the possibility of quantum tunneling of the black hole geometry itself. A robust possibility for treating the quantum tunneling of a spacetime geometry is through a complex path integral and PicardLefschetz theory.
Finite regions, spherical entanglement, and quantum gravity
Black Holes  3

Norbert Bodendorfer FriedrichAlexanderUniversität ErlangenNürnberg

Yasha Neiman Okinawa Institute of Science and Technology (OIST)

Marc Geiller École normale supérieure (ENS)

Hal Haggard Bard College