arXiv subjects

K. Ikegami

Publications and source records attributed to K. Ikegami.

3 recordsLinked to original sources

arXiv1993

Superfield Formalism of Stochastic Quantization Method with Field-Dependent Kernels

I consider a Langevin equation with field-dependent kernels and investigate supersymmetry of the stochastic generating functional constructed from the Langevin equation. Moreover I describe the stochastic generating functional in terms of a superfield. In the superfield formalism, it becomes clear that the stochastic quantization method with the field-dependent kernel is equivalent to the path-integral quantization method.

hep-th↗

arXiv1992

Treatment of Constraints in Stochastic Quantization Method and Covariantized Langevin Equation

We study the treatment of the constraints in stochastic quantization method. We improve the treatment of the stochastic consistency condition proposed by Namiki et al. by suitably taking account of the Ito calculus. Then we obtain an improved Langevin equation and the Fokker-Planck equation which naturally leads to the correct path integral quantization of the constrained system as the stochastic equilibrium state. This treatment is applied to $O(N)$ non-linear $σ$ model and it is shown that singular terms appearing in the improved Langevin equation cancel out the $δ^n(0)$ divergences in one loop order. We also ascertain that the above Langevin equation, rewritten in terms of independent variablesis, actually equivalent to the one in the general-coordinate-transformation-covariant and vielbein-rotation-invariant formalism.

hep-th↗

arXiv1992

Dynamical Symmetry Breaking on Langevin Equation : Nambu $\cdot$ Jona-Lasinio Model

In order to investigate dynamical symmetry breaking, we study Nambu$\cdot$Jona-Lasinio model in the large-N limit in the stochastic quantization method. Here in order to solve Langevin equation, we impose specified initial conditions and construct ``effective Langevin equation'' in the large-N limit and give the same non-perturbative results as path-integral approach gives. Moreover we discuss stability of vacuum by means of ``effective potential''.

hep-th↗