Quantum Field Theory: -- General Relativistic and Ultraviolet Divergence Free. Part I --

Relativistic Quantum Field Theory

Quantum Field Theory without Divergence A

On the basis a new conjecture, we present a new Lagrangian density and a new quantization method for QED, construct coupling operators and mass operators, derive scattering operators Sf and Sw which are dependent on each other and supplement new Feynman rules. Sf and Sw together determine a Fenman integral. Hence all Feynman integrals are convergent and it is unnecessary to introduce regulariza...

8.324 Relativistic Quantum Field Theory II

The renormalization program has been shown to be a success operationally: 1. For a renormalizable theory, all ultraviolet divergences can be absorbed into redefinitions of bare quan­ tities, which are not observable. What is meant by the set of physical observables is unambiguous: it is well-defined in terms of a small number of physical couplings, masses and so forth. 2. The requirement of ren...

Introduction to Relativistic Quantum Field Theory

Quasiparticle excitations in relativistic quantum field theory

We analyze the particle-like excitations arising in relativistic field theories in states different than the vacuum. The basic properties characterizing the quasiparticle propagation are studied using two different complementary methods. First we introduce a frequency-based approach, wherein the quasiparticle properties are deduced from the spectral analysis of the twopoint propagators. Second,...