Topic: A Topological Vertex for Orientifolds and Freezing.pdf

Speaker: Assoc. Prof. Rui-Dong Zhu

Coordinates: PCFT C1124, 16:00, Thursday, June 13

Abstract: The topological vertex formalism provides an alternative way to calculate Nekrasov instanton partition functions for theories with brane construction. It has been extended to include O5-orientifolds in recent years. In this talk, we propose a new topological vertex formalism for O7^+-plane. We show its consistency with O5-construction based a mathematical identity, which further uncover a quantitative description of the freezing of O7^+/O6^+ in the string theory.