Vanishing Perturbative Vacuum Energy in Non-Supersymmetric Orientifolds

TL;DR

This paper introduces a new mechanism for supersymmetry breaking in orientifold models that results in a vanishing vacuum energy contribution at multiple perturbative levels, suggesting a potential solution to the cosmological constant problem.

Contribution

It proposes a novel source of supersymmetry breaking in orientifold models that leads to zero vacuum energy contributions at all perturbative levels.

Findings

Vacuum energy vanishes at genus zero and three-half.

All higher-genus perturbative contributions also vanish.

Supports the idea of stable non-supersymmetric vacua with zero cosmological constant.

Abstract

We present a novel source for supersymmetry breaking in orientifold models, and show that it gives a vanishing contribution to the vacuum energy at genus zero and three-half. We also argue that all the corresponding perturbative contributions to the vacuum energy from higher-genus Riemann surfaces vanish identically.