The Cap in the Hat: Unoriented 2D Strings and Matrix(-Vector) Models
High Energy Physics - Theory
2009-11-10 v2
Abstract
We classify the possible bosonic and Type 0 unoriented string theories in two dimensions, and find their dual matrix(-vector) models. There are no RP^2 R-R tadpoles in any of the models, but many of them possess a massless tachyon tadpole. Thus all the models we find are consistent two-dimensional string vacua, but some get quantum corrections to their classical tachyon background. Where possible, we solve the tadpole cancellation condition, and find all the tachyon tadpole-free theories.
Cite
@article{arxiv.hep-th/0311068,
title = {The Cap in the Hat: Unoriented 2D Strings and Matrix(-Vector) Models},
author = {Oren Bergman and Shinji Hirano},
journal= {arXiv preprint arXiv:hep-th/0311068},
year = {2009}
}
Comments
34 pages, LaTeX; Errors corrected in some of the open string representations in tables 1, 2 and 3. References and acknowledgments added