One Loop to Rule Them All: Eight and Nine Dimensional String Vacua from Junctions

Abstract

String and 5-brane junctions are shown to succinctly classify all known 8d $\mathcal{N}$=1 string vacua. This requires an extension of the description for ordinary $[p,q]$-7-branes to consistently include O7${}^{+}$-planes, which then naturally encodes the dynamics of ${\mathfrak{sp}}_n$ gauge algebras, including their higher-form center symmetries. Central to this analysis are loop junctions, i.e., strings/5-branes which encircle stacks of 7-branes and O7${}^{+}$'s. Loop junctions further signal the appearance of affine symmetries of emergent 9d descriptions at the 8d moduli space's boundaries. Such limits reproduce all 9d string vacua, including the two disconnected rank (1,1) moduli components.

47 pages + appendices, 8 figures, long table in Appendix C

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• IIB Explored: Reflection 7-Branes
• New Supersymmetric String Theories from Discrete Theta Angles
• The Standard Model from String Theory: What Have We Learned?
• Bordism for the 2-group symmetries of the heterotic and CHL strings
• Unifying the 6D $\mathcal{N}=(1,1)$ String Landscape
• New Supersymmetric String Moduli Spaces from Frozen Singularities
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• Consistency of eight-dimensional supergravities: Anomalies, Lattices and Counterterms