ITMP seminar, Feb 22, 2023
Speaker: Xiang Zhao, EPFL Lausanne, FSL
Title: QFT in AdS instead of LSZ
Abstract: Quantum field theories in AdS generate conformal correlation functions on the boundary, and in the limit where AdS is nearly flat one should be able to extract an S-matrix from such correlators. In this talk I will discuss a particularly simple position-space procedure to do so. In the first half I will state the prescription, motivate it through perturbative examples and discuss some of its subtleties. In the second half, I will move on to non-perturbative establishment of the flat-space limit prescription. With minimal assumptions I will show that the resulting S-matrix element from the flat-space limit obeys a dispersion relation and the non-linear unitarity conditions.
12 июл 2023
