Introduction to Lightcone Conformal Truncation: QFT Dynamics from CFT Data

Understand

We both review and augment the lightcone conformal truncation (LCT) method.

• LCT is a Hamiltonian truncation method for calculating dynamical quantities in QFT in infinite volume.
• This document is a self-contained, pedagogical introduction and "how-to" manual for LCT.
• We focus on 2D QFTs which have UV descriptions as free CFTs containing scalars, fermions, and gauge fields, providing a rich starting arena for LCT applications.