This book provides a thorough introduction to the specialized techniques needed to carry out numerical simulations of a description of lattice discretizations of fermions and gauge fields, methods for actually doing a simulation, descriptions of common strategies to connect simulation results to predictions of physical quantities, and a discussion of uncertainties in lattice simulations. More importantly, while lattice QCD is a well-defined field in its own right, it has many connections to continuum field theory and elementary particle physics phenomenology, which are carefully elucidated in this book.
Quantum Chromodynamics (QCD) is the theory describing how quarks and gluons interact to form protons, neutrons, and other particles. These interactions are super complex, so solving QCD equations directly is impossible in most cases. Lattice QCD simplifies the problem by imagining space and time as a grid (or lattice) instead of being continuous. This makes calculations manageable on supercomputers.