
arXiv: 1608.07835
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.
High Energy Physics - Theory, Mathematics - Number Theory, moonshine, FOS: Physical sciences, mock modular form, 510, Relationship to Lie algebras and finite simple groups, group cohomology, High Energy Physics - Theory (hep-th), FOS: Mathematics, Number Theory (math.NT), finite group representations, Representation Theory (math.RT), Forms of half-integer weight; nonholomorphic modular forms, Representations of sporadic groups, Mathematics - Representation Theory
High Energy Physics - Theory, Mathematics - Number Theory, moonshine, FOS: Physical sciences, mock modular form, 510, Relationship to Lie algebras and finite simple groups, group cohomology, High Energy Physics - Theory (hep-th), FOS: Mathematics, Number Theory (math.NT), finite group representations, Representation Theory (math.RT), Forms of half-integer weight; nonholomorphic modular forms, Representations of sporadic groups, Mathematics - Representation Theory
| selected citations These citations are derived from selected sources. This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | 2 | |
| popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network. | Average | |
| influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | Average | |
| impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network. | Average |
