Particle Physics Seminar, Matthew Baumgart, Carnegie Mellon, "De Sitter Wavefunctionals and the Resummation of Time"

Feb 27, 2015, 4:00 pm5:30 pm
Joseph Henry Room


Event Description
The holographic RG of Anti-De Sitter gives a powerful clue about the underlying AdS/CFT correspondence. The question is whether similar hints can be found for the heretofore elusive holographic dual of De Sitter. The framework of stochastic inflation uses nonperturbative insight to tame bad behavior in the perturbation series of a massless scalar in DS at late times. Remarkably, this fully quantum system loses phase information in the leading approximation, but retains a probabilistic character and allows for a controlled prediction of late time Green's functions. Recasting this as a "resummation of time", we wish to understand whether the distributions that result can be thought of as an attractive UV fixed point of a theory living on a spacelike slice of DS. We derive stochastic inflation via the wavefunctional approach to Quantum Field Theory. This allows for the straightforward implementation of corrections to the original framework.