Reflection groups of Lorentzian lattices
classification
🧮 math.GR
math.NT
keywords
groupsreflectionlatticeslorentzianexamplesprinciplecertaincontrolled
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The aim of this paper is to provide evidence for the following new principle: interesting reflection groups of Lorentzian lattices are controlled by certain modular forms with poles at cusps. We use this principle to explain many of the known examples of such reflection groups, and to find several new examples of reflection groups of Lorentzian lattices, including one whose fundamental domain has 960 faces.
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