... starting point for us is the quantum- mechanical phase-space path integrals studied in chapter 2. In most practical applications in QFT, these path integrals can be reduced to the Feynman path integrals ... vector indices µ,ν, take, in some expressions, Path Integrals in PhysicsVo l um e I I Quantum Field Theory, Statistical Physics andother Modern Applications10 Quantum field theory: the path- integral ... applicationof path (functional) integrals in this area is highly natural.♦ Path integrals in scalar field theory In fact, the introduction of quantum fields, presented in this section, as the limit...