In the 1980's, Atiyah introduced a mathematical definition of
the notion of a topological quantum field theory. In this talk,
I'll recall Atiyah's definition and explain the motivation for the
more elaborate notion of an extended topological field...
Although it is known that AdS/CFT as a quantum erasure
correction code is only approximate, there is still much to learn
about the precise bulk physical consequences of deviating from
exact erasure correction codes. In this talk, I will take...
Black holes are never isolated in realistic astrophysical
environments; instead, they are often perturbed by complicated
external tidal fields. How does a black hole respond to these tidal
perturbations? In this talk, I will discuss both the...
