Part 1/10:
Understanding the Challenges of Quantum Field Theory
Quantum Field Theory (QFT) represents one of the cornerstones of modern physics, encoding our understanding of fundamental particles and their interactions. Despite its success in computing scattering amplitudes and predicting experimental outcomes with remarkable accuracy, QFT remains a domain fraught with challenges and ambiguities. In exploring the difficulties surrounding the rigorous definition of QFT, particularly beyond the path integral approach, one must delve into the nuances that underlie its theoretical framework.