Found 3 result(s)
Triangular Seminar Frank Ferrari (Universite Libre de Bruxelles, Intl. Solvay Inst., IBS)
at: 16:00 room S1.27  abstract: TRIANGULAR SEMINAR:
New techniques of large N and large D allow to study analytically planar matrix quantum mechanics at strong coupling in a reliable way. Using these techniques, we found a remarkable phase transition in these systems, which is very naturally interpreted as a quantum version of the phenomenon of black hole formation in a gravitational collapse.

Regular Seminar Frank Ferrari (Brussels U.)
at: 14:00 room G.O. Jones 610  abstract: In many instances of holographic correspondences between a d dimensional boundary theory and a d+1 dimensional bulk, a simple argument in the boundary theory implies that there must exist a direct relation between the onshell Euclidean gravitational bulk action and the onshell Euclidean action of a (d1)brane probing the bulk geometry. This relation is crucial for the consistency of holography but puzzling from the bulk perspective. We provide a full bulk derivation in the case of pure gravity. A central role is played by a nontrivial isoperimetric inequality that must be satisfied in a large class of PoincaréEinstein spaces. Remarkably, this inequality follows from a theorem by John Lee. 
Regular Seminar Frank Ferrari (ULB and International Solvay Institute)
at: 14:00 room H503  abstract: We explain how to define, in matrix (gauge) field theory, the notion of the effective action of k ``probe'' branes in the presence of N ``background'' branes on which the field theory lives. The analysis of the large N planar diagram expansion which computes the effective action yields a simple and generic mechanism explaining the emergence of holographic space dimensions. The resulting effective action matches the nonabelian Dbrane action in the closed string background dual to the field theory. We shall discuss briefly a few explicit examples, and also provide a general introduction to the notion of emerging space. 