N=1/2 supersymmetric four-dimensional non-linear sigma-models from non-anti-commutative superspace

TL;DR

This paper analyzes the structure of N=1/2 supersymmetric non-linear sigma-models in four-dimensional non-anti-commutative superspace, revealing effects like splitting and fuzziness of potentials, and demonstrating non-uniqueness of such deformations.

Contribution

It provides a detailed component-level analysis of N=1/2 supersymmetric NLSMs in NAC superspace, including explicit results for CP(n) models and insights into the non-uniqueness of deformations.

Findings

Splitting of potentials for single chiral superfield

Fuzziness of potentials with multiple chiral superfields

Deformation non-uniqueness in NAC superspace

Abstract

The component structure of a generic N=1/2 supersymmetric Non-Linear Sigma-Model (NLSM) defined in the four-dimensional (Euclidean) Non-Anti-Commutative (NAC) superspace is investigated in detail.The most general NLSM is described in terms of arbitrary K"ahler potential,and chiral and anti-chiral superpotentials. The case of a single chiral superfield gives rise to splitting of the NLSM potentials, whereas the case of several chiral superfields results in smearing (or fuzziness) of the NLSM potentials, while both effects are controlled by the auxiliary fields. We eliminate the auxiliary fields by solving their algebraic equations of motion, and demonstrate that the results are dependent upon whether the auxiliary integrations responsible for the fuzziness are performed before or after elimination of the auxiliary fields. There is no ambiguity in the case of splitting, i.e. for a single chiral superfield. Fully explicit results are derived in the case of the N=1/2 supersymmetric NAC-deformed CP(n) NLSM in four dimensions. Here we find another surprise that our results differ from the N=1/2 supersymmetric CP(n) NLSM derived by the quotient construction from the N=1/2 supersymmetric NAC-deformed gauge theory. We conclude that an N=1/2 supersymmetric deformation of a generic NLSM from the NAC superspace is not unique.