Theoretical and Applied Physics

Quantum Field Theory

Quantum field theory, since its inception, has been the basic framework for describing the physics of the elementary particle and their interactions. Its success in quantum electrodynamics has been tremendous, leading to the best theoretical predictions of the whole physics as of now. Later, the use of QFT in the description of weak and strong interactions, was also extremely helpful and productive, converging for the standard model, which has a vast and impressive body of experimental support. During the 80’s, the efforts to produce a quantum field theory based grand unified model for the weak, strong and electromagnetic interactions, failed. It was considered to be the starting point for the attempts to use new methods such as string theory in high-energy physics.