Generalised Umbral Moonshine

Abstract

Umbral moonshine describes an unexpected relation between 23 finite groups arising from lattice symmetries and special mock modular forms. It includes the Mathieu moonshine as a special case and can itself be viewed as an example of the more general moonshine phenomenon which connects finite groups and distinguished modular objects. In this paper we introduce the notion of generalised umbral moonshine, which includes the generalised Mathieu moonshine [Gaberdiel M.R., Persson D., Ronellenfitsch H., Volpato R., Commun. Number Theory Phys. 7 (2013), 145-223] as a special case, and provide supporting data for it. A central role is played by the deformed Drinfel'd (or quantum) double of each umbral finite group $G$, specified by a cohomology class in $H^3(G,U(1))$. We conjecture that in each of the 23 cases there exists a rule to assign an infinite-dimensional module for the deformed Drinfel'd double of the umbral finite group underlying the mock modular forms of umbral moonshine and generalised umbral moonshine. We also discuss the possible origin of the generalised umbral moonshine.

References in corpus (7)

• Mock Theta Functions
• Notes on the K3 Surface and the Mathieu group M_24
• Note on Twisted Elliptic Genus of K3 Surface
• A proof of the Thompson Moonshine Conjecture
• Weight One Jacobi Forms and Umbral Moonshine
• Super Vertex Algebras, Meromorphic Jacobi Forms and Umbral Moonshine
• Representation Theory of Twisted Group Double

Cited by in corpus (8)

• The Moonshine Anomaly
• Weight One Jacobi Forms and Umbral Moonshine
• K3 String Theory, Lattices and Moonshine
• Third Homology of some Sporadic Finite Groups
• Niemeier Lattices in the Free Fermionic Heterotic-String Formulation
• TASI Lectures on Moonshine
• Genus-One data and Anomaly Detection
• Topological Mathieu Moonshine