Tachyon-free Orientifolds of Type 0B Strings in Various Dimensions

TL;DR

This paper constructs non-tachyonic, non-supersymmetric orientifold models of Type 0B string theory across multiple dimensions, featuring unitary gauge groups and charged matter, though often with uncanceled dilaton tadpoles.

Contribution

It presents new non-tachyonic, non-supersymmetric orientifold constructions of Type 0B strings in various dimensions, expanding the landscape of consistent string models.

Findings

Models have unitary gauge groups with charged matter

Typically exhibit uncanceled dilaton tadpoles

Constructed in 10, 6, and 4 dimensions

Abstract

We construct non-tachyonic, non-supersymmetric orientifolds of Type 0B strings in ten, six and four space-time dimensions. Typically, these models have unitary gauge groups with charged massless fermionic and bosonic matter fields. However, generically there remains an uncancelled dilaton tadpole.