BHI Colloquium


Tuesday, December 8, 2020, 1:30pm to 2:30pm


Zoom link in description

Eva Silverstein (Physics) - Stanford University

Title: String Spreading and Black Hole Physics

Abstract: Any black hole is a gradual accelerator, generating large center of mass energy for pairs of test objects in the near horizon region. For Schwarzschild, there is a large but nonlocal energy invariant between early and late near-horizon systems, while for very near-extremal Kerr even locally enhanced energies arise for fine-tuned probes. In quantum gravity, we find extended objects exemplified by perturbative strings, which may interact nonlocally (but still causally). S-matrix as well as light cone gauge calculations in perturbative string theory indicate a specific long-range interaction known as longitudinal spreading. In this talk, we will first summarize the basic physics and calculations of this effect, recently upgraded to an Eikonal resummation in closed string theory. Then we will explain two applications: (i) implications for information transfer in black hole evaporation and (ii) a de-tuning of the Banados-Silk-West high energy scattering effect in Kerr black holes.

Bio: Eva Silverstein received her PhD in physics from Harvard University in 1992.  She is currently a Professor of Physics at Stanford University’s Institute for Theoretical Physics.  Her research includes studying the basic degrees of freedom and interactions underlying gravitational and particle physics as well as the mechanism behind the initial seeds of structure in the universe. 

Link to Zoom

See also: Physics