Towards N=2 $SUSY$ Homogeneous Quantum Cosmology; Einstein--Yang--Mills systems

TL;DR

This paper explores the use of N=2 supersymmetric quantum mechanics to quantize homogeneous gravitational systems, specifically Einstein-Yang-Mills models, revealing supersymmetry structures and spontaneous breaking mechanisms.

Contribution

It develops a superfield formulation for N=2 SUSY sigma models applied to Einstein-Yang-Mills cosmologies, providing explicit superpotentials and analyzing SUSY breaking by YM instantons.

Findings

All studied models admit embedding into N=2 SUSY sigma models.

Superpotentials are sums of gravitational and YM parts, with YM parts matching Chern-Simons terms.

SUSY breaking occurs spontaneously due to YM instantons.

Abstract

The application of N=2 supersymmetric quantum mechanics for the quantization of homogeneous systems coupled with gravity is discussed. Starting with the superfield formulation of an N=2 SUSY sigma model, Hermitian self-adjoint expressions for quantum Hamiltonians and Lagrangians for any signature of a sigma-model metric are obtained. This approach is then applied to coupled SU(2) Einstein-Yang-Mills (EYM) systems in axially symmetric $Bianchi$-type I, II, VIII, IX, $Kantowski-Sachs$, and closed $Friedmann-Robertson-Walker$ cosmological models. It is shown that all these models admit the embedding into the N=2 SUSY sigma model with the explicit expressions for superpotentials being direct sums of gravitational and Yang-Mills (YM) parts. In addition, the YM parts of superpotentials exactly coincide with the corresponding Chern-Simons terms. The spontaneous SUSY breaking caused by YM instantons in EYM systems is discussed in a number of examples.