Niels Obers, Niels Bohr Institute
Blackfold approach to higher-dimensional black holes

During the last decade it has become clear that the phase structure of higher-dimensional black hole spacetimes is far more complex and vast than what was a priori thought. I will discuss a new method that has been recently developed to to understand the landscape of higher dimensional black holes. This is an effective world-volume approach to the construction of black holes, called the blackfold approach, obtained by curving black branes into a submanifold of a background spacetime. I will discuss the essentials of this formalism, which regards the black hole as an effective fluid living on a dynamical worldvolume. A number of illustrative applications to new families of stationary black holes, including charged cases and black holes in anti-de Sitter backgrounds will be discussed. I will also comment on relations to extremal black holes in string theory and the DBI action. Finally, I will exhibit how the fluid-dynamical aspects of the blackfold approach can be used to address stability of black holes.