On two-loop effective action of 2d sigma model
P. V. Akacevich, А. В. Иванов
Abstract
Abstract In this paper, we study two-loop contribution to the effective action of a two-dimensional non-linear sigma model. We derive a new formula, which can be applicable to a regularization of general type. As examples, we obtain known results for the dimensional regularization and investigate new types of a cutoff one. Also, we discuss non-local contributions and restrictions on the regularization.
Topics & Concepts
Action (physics)Loop (graph theory)SigmaSix SigmaMathematicsPhysicsEngineeringCombinatoricsOperations managementQuantum mechanicsLean manufacturingBlack Holes and Theoretical PhysicsCosmology and Gravitation TheoriesQuantum Chromodynamics and Particle Interactions