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6 papers · 2 filters
Gauge Independence in terms of the Functional Integral
T. Kashiwa, N. Tanimura
Among various approaches in proving gauge independence, models containing an explicit gauge dependence are convenient. The well-known example is the gauge parameter in the covarian…
Nonperturbative renormalization group in a light-front three-dimensional real scalar model
Takanori Sugihara, Masanobu Yahiro
The three-dimensional real scalar model, in which the symmetry spontaneously breaks, is renormalized in a nonperturbative manner based on the Tamm-Dancoff truncation of the F…
Perturbative Tamm-Dancoff Renormalization
Koji Harada, Atsushi Okazaki
A new two-step renormalization procedure is proposed. In the first step, the effects of high-energy states are considered in the conventional (Feynman) perturbation theory. In the…
Physical States and Gauge Independence of the Energy-Momentum Tensor in Quantum Electrodynamics
Taro Kashiwa, Naoki Tanimura
Discussions are made on the relationship between physical states and gauge independence in QED. As the first candidate take the LSZ-asymptotic states in a covariant canonical forma…
Multi-Periodic Coherent States and the WKB-Exactness
Kazuyuki Fujii, Kunio Funahashi
We construct the path integral formula in terms of ``multi-periodic'' coherent state as an extension of the Nielsen-Rohrlich formula for spin. We make an exact calculation of the f…
Dynamics of the Light-Cone Zero Modes: Theta Vacuum of the Massive Schwinger Model
Koji Harada, Atsushi Okazaki, Masa-aki Taniguchi
The massive Schwinger model is quantized on the light cone with great care on the bosonic zero modes by putting the system in a finite (light-cone) spatial box. The zero mode of $A…