O-vertex, O7+^+-plane, and Topological Vertex

Dec 27, 2024
32 pages
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Abstract: (arXiv)
We revisit the instanton partition function for 5d N=1\mathcal{N}=1 SO(NN) gauge theories compactified on S1^1, computed from the topological vertex formalism with the O-vertex based on a 5-brane web diagram with an O5-plane. We introduce an identity that enables us to rewrite the unrefined partition function into a new expression in terms of the Nekrasov factors summed over Young diagrams, which can be interpreted as the freezing of an O7-plane. Based on this, we propose topological vertex formalism with an O7+^+-plane.
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  • 32 pages, 12 figures