Fox and Hedgehog Seminar Series - Where do low-energy states live in QFT?

Quantum field theory (QFT) forms the backbone of our conceptual understanding of most physical systems, yet our ability to use this framework to make quantitative predictions is largely limited to systems which are weakly-interacting or have large amounts of symmetry, leaving a significant gap in our understanding of the physical world. I will discuss a simple but important first step in closing this gap: understanding the structure of low-energy states in general QFTs. As I will explain, these states are not only some of the most relevant to actual experiments (both in particle physics and condensed matter), but they also have unique properties that allow us to make concrete predictions about their dynamics, even in general strongly-interacting systems.