Quasi-Jacobi Forms, Elliptic Genera and Strings in Four Dimensions

21 May 2020 Lee Seung-Joo Lerche Wolfgang Lockhart Guglielmo Weigand Timo

We investigate the interplay between the enumerative geometry of Calabi-Yau fourfolds with fluxes and the modularity of elliptic genera in four-dimensional string theories. We argue that certain contributions to the elliptic genus are given by derivatives of modular or quasi-modular forms, which encode BPS invariants of Calabi-Yau or non-Calabi-Yau threefolds that are embedded in the given fourfold... (read more)

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  • HIGH ENERGY PHYSICS - THEORY