Orateur
Prof.
Francesco Nitti
(APC)
Description
Constructing cosmological solutions in the context of string theory has been notoriously elusive. In this talk I will discuss, from a bottom up point of view, possible ways of obtaining de Sitter/cosmological geometries based on the gauge/gravity duality. These methods are alternative to the standard route (finding a semiclassical vacuum solution of string theory with an effective positive vacuum energy), avoid some common pitfalls and problems, and can potentially be implemented as top-down string theory constructions. These solutions have a field theory dual description as non-vacuum states in (deformed) conformal field theories, and arise due to either non-trivial sources or non-trivial initial conditions.
