# Physics & Astronomy Colloquium
3:30 PM, Friday, April 26, 2013
Room 155, Chem-Phys Building
** Dr. Frans Pretorius**
Princeton University
** Black Holes: Probes of the Cosmos and Fundamental Physics
**
The class of spacetimes with event horizons contain some of the most
fascinating solutions to the equations of general relativity. Over
the past few years, numerical simulations have begun to reveal many
dynamical, strong-field solutions not amenable to exact analytical or
perturbative treatments. In this talk, I will describe 3 such scenarios. First,
the inspiral and merger of two black holes, which is thought to
occur frequently in the universe. Such events are powerful emitters
of gravitational waves, and a concerted world-wide effort is currently
underway to observe them. Second, I will discuss the ultra-relativistic collision
of two solitons. Arguments suggest that at sufficiently high velocities
gravity dominates the interaction, causing a black hole to form. These
arguments underlie claims that the Large Hadron Collider, or cosmic
ray collisions with the Earth, will produce black holes in speculative large extra
dimension scenarios. Finally, I will show results elucidating the fate of a black
string in 5 dimensions, subject to the Gregory-Laflamme instability. Rather
remarkably, the event horizon exhibits dynamics akin to a low viscosity fluid stream
suffering the Raleigh-Plateau "beading" instability. In the gravitational process
arbitrarily large spacetime curvatures are revealed to an external observer, culminating
in naked singularities.
Refreshments will be served in CP 179 at 3:15 PM |