Hal Haggard: Random Geometries, Gravitational Waves, and the Black Hole Spin Puzzle
One of the most striking inroads into observations of quantum phenomena is through statistical predictions, such as Planck's prediction of black-body radiation. I will describe how to use the Bekenstein-Hawking entropy formula and general-relativistic statistical mechanics to determine the probability distribution of random geometries uniformly sampled in phase space. This statistics (in the limit hbar → 0) is relevant to large curvature perturbations, resulting in a population of primordial black holes with zero natal spin. In principle, the identification of such a population at LIGO, Virgo, and future gravitational wave observatories could provide the first observational evidence for the statistical nature of black hole entropy.
Steve Giddings: Quantum black holes: crisis to observational prospects
Attempts to reconcile black holes with quantum evolution have produced a crisis, which may yield observational opportunities arising from new quantum gravitational effects. After briefly summarizing this crisis, I’ll overview some leading proposed resolutions. A common theme of many of these is new dynamics on the horizon scale; combining this with our newfound access to both electromagnetic and gravitational wave observations of this scale suggests seeking observational signatures. I’ll particularly outline a scenario with `minimal’ new quantum effects, and its possible observational windows.
https://uni-jena-de.zoom.us/j/69556470634
Meeting ID: 695 5647 0634
Passcode: QG-AA