Abstract

Quantum Field Theory (QFT) stands as one of the most successful frameworks in modern physics, with more than thirty Nobel Prizes medals in Physics awarded for discoveries directly or indirectly related to it. It combines quantum mechanics and special relativity into a single consistent framework. Within the framework of the Standard Model, QFT unifies the three fundamental forces — electromagnetic, weak, and strong interactions — forming what is often regarded as an almost complete theory of all known phenomena except gravity.

Beyond being the foundation of elementary particle physics, QFT also offers powerful tools for understanding many phenomena in surface physics — such as quantum diffusion in open quantum systems, phonon lifetimes, and frequency shifts.

This seminar serves as both an introduction and a motivation for the subsequent talks in this series, including the more technical presentations by other group members in the coming weeks. A basic familiarity with quantum mechanics and the Euler–Lagrange formalism is assumed.