Comments on Non-Supersymmetric Type I Vacua

TL;DR

This paper reviews non-supersymmetric Type IIB orbifolds with zero cosmological constant, highlighting that supersymmetry is preserved on branes but broken in the bulk, offering insights into string theory vacua.

Contribution

It provides a detailed analysis of open descendants of non-supersymmetric Type IIB orbifolds with zero cosmological constant, emphasizing the supersymmetry status on branes versus the bulk.

Findings

Supersymmetry remains unbroken on branes at all mass levels.

Supersymmetry is broken in the bulk of the orbifold.

The models maintain zero cosmological constant.

Abstract

We review open descendants of non-supersymmetric type IIB asymmetric orbifolds with zero cosmological constant. We find that supersymmetry remains unbroken on the branes at all mass levels, whereas it is broken in the bulk.