On the Role of Space-Time Foam in Breaking Supersymmetry via the Barbero-Immirzi Parameter

TL;DR

This paper explores how space-time foam and a dilaton/axion superfield can induce supersymmetry breaking in supergravity theories, linking quantum gravity effects with low-energy phenomenology and string theory models.

Contribution

It proposes a novel mechanism where the Barbero-Immirzi parameter and space-time foam induce supersymmetry breaking through a dilaton/axion superfield in supergravity.

Findings

Dilaton/axion superfield can act as a Barbero-Immirzi field.

Fermionic component may serve as a Goldstino in low-energy effective action.

Supersymmetry breaking communicated via supergravity coupling in a D-foam model.

Abstract

We discuss how: (i) a dilaton/axion superfield can play the role of a Barbero-Immirzi field in four-dimensional conformal quantum supergravity theories, (ii) a fermionic component of such a dilaton/axion superfield may play the role of a Goldstino in the low-energy effective action obtained from a superstring theory with F-type global supersymmetry breaking, (iii) this global supersymmetry breaking is communicated to the gravitational sector via the supergravity coupling of the Goldstino, and (iv) such a scenario may be realized explicitly in a D-foam model with D-particle defects fluctuating stochastically.