arXiv subjects

Donal O'Driscoll

Publications and source records attributed to Donal O'Driscoll.

3 recordsLinked to original sources

arXiv1999

Towards a supersymmetric classification of D-brane configurations with odd spin structure

We consider the construction of a general tree level amplitude for the interactions between dynamical D-branes where the configurations have non-zero odd spin structure. Using Riemann Theta Identities we map the conditions for the preservation of some supersymmetry to a set of integer matrices satisfying a simple but non-trivial equation. We also show how the regularization of the RR zero modes plays an important role in determining which configurations are permitted.

hep-th↗

arXiv1999

Non-Perturbative Structure in Heterotic Strings from Dual F-Theory Models

We examine how to construct explicit heterotic string models dual to F-theory in eight dimensions. In doing so we learn about where the moduli spaces of the two theories overlap, and how non-perturbative features leave traces on a purely perturbative level. We also propose a modified T-duality linking M and F-theories based on non-perturbative structures of string theories in eight dimensions.

hep-th↗

arXiv1998

General Abelian Orientifold Models and One Loop Amplitudes

We construct a one loop amplitude for any Abelian orientifold point group for arbitary complex dimensions. From this we show several results for orientifolds in this general class of models as well as for low dimensional compactifications. We also discuss the importance and structure of the contribution of orientifold planes to the dynamics of D-branes, and give a physical explaination for the inconsistency of certain Z_4 models as discovered by Zwart.

hep-th↗