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2d mathcal{N}=(0,1) Gauge Theories and Spin(7) Orientifolds

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arxiv 2110.03696 v2 pith:ZMFV3GNO submitted 2021-10-07 hep-th

2d mathcal{N}=(0,1) Gauge Theories and Spin(7) Orientifolds

classification hep-th
keywords spinmathcalorientifoldstheoriesanti-holomorphiccalabi-yauconstructionfolds
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We initiate the geometric engineering of 2d $\mathcal{N}=(0,1)$ gauge theories on D1-branes probing singularities. To do so, we introduce a new class of backgrounds obtained as quotients of Calabi-Yau 4-folds by a combination of an anti-holomorphic involution leading to a Spin(7) cone and worldsheet parity. We refer to such constructions as Spin(7) orientifolds. Spin(7) orientifolds explicitly realize the perspective on 2d $\mathcal{N}=(0,1)$ theories as real slices of $\mathcal{N}=(0,2)$ ones. Remarkably, this projection is geometrically realized as Joyce's construction of Spin(7) manifolds via quotients of Calabi-Yau 4-folds by anti-holomorphic involutions. We illustrate this construction in numerous examples with both orbifold and non-orbifold parent singularities, discuss the role of the choice of vector structure in the orientifold quotient, and study partial resolutions.

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  1. Elliptic Genera of 2d $\mathcal{N}=(0,1)$ Gauge Theories

    hep-th 2025-08 unverdicted novelty 7.0

    Derives a residue formula for elliptic genera in 2d (0,1) gauge theories that recovers the Jeffrey-Kirwan prescription for (0,2) theories and applies it to the Gukov-Pei-Putrov model to study its phase structure.