# Mock modularity and a secondary elliptic genus

@article{Gaiotto2019MockMA, title={Mock modularity and a secondary elliptic genus}, author={Davide Gaiotto and Theo Johnson-Freyd}, journal={arXiv: High Energy Physics - Theory}, year={2019} }

The theory of Topological Modular Forms suggests the existence of deformation invariants for two-dimensional supersymmetric field theories that are more refined than the standard elliptic genus. In this note we give a physical definition of some of these invariants. The theory of mock modular forms makes a surprise appearance, shedding light on the integrality properties of some well-known examples.

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