Spinors and Supersymmetry

TL;DR

This paper surveys the properties of spinors and supersymmetry across various flat and curved spaces, analyzing algebraic structures and recent advances in superspace realizations, with progress in certain geometries.

Contribution

It provides a comprehensive comparison of SUSY algebra structures in different spaces and reports on new superspace realizations in specific geometries.

Findings

SUSY generators anti-commute to translation generators in flat spaces.

SUSY generators anti-commute to isometry generators in curved spaces.

Progress in superspace realizations varies across different geometries.

Abstract

In this paper, we survey the nature of spinors and supersymmetry (SUSY) in various types of spaces. We treat two distinct types of spaces: flat spaces and spaces of constant (non-zero) curvature. The flat spaces we consider are either three or four dimensional of signatures 3 + 1, 4 + 0, 2 + 2 and 3 + 0. In each of these cases, SUSY generators anti-commute to yield the generators of translations in the non-compact flat spaces. The spaces of constant curvature we consider are two-dimensional: the surface of the sphere S_2 and the Anti-deSitter space AdS_2. S_2 is embedded in a 3 + 0 Euclidean space while AdS_2 is embedded in 2 + 1 Minkowski space. The SUSY generators in these cases anti-commute to yield the generators of the isometry groups (SO(3) or SO(2,1)) of the space involved. We also report on some recent developments in looking for superspace realizations of these SUSY algebras. We can report good progress in the 3 + 0 Euclidean and in the AdS_2 case, somewhat less in the S_2 case. In each of the compact cases, we can construct field multiplet models carrying invariance under the full SUSY algebra.