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Composite genus one Belyi maps
Authors:Raimundas Vidunas  Yang-Hui He
Institution:1. Graduate School of Information Science and Technology, Osaka University, Osaka, Japan;2. Department of Mathematics, City, University of London, EC1V 0HB, UK;3. School of Physics, NanKai University, Tianjin, 300071, PR China;4. Merton College, University of Oxford, OX14JD, UK
Abstract:Motivated by a demand for explicit genus 1 Belyi maps from theoretical physics, we give an efficient method of explicitly computing genus one Belyi maps by (1) composing covering maps from elliptic curves to the Riemann sphere with simpler (univariate) genus zero Belyi maps, as well as by (2) composing further with isogenies between elliptic curves. The computed examples of genus 1 Belyi maps has doubly-periodic dessins d’enfant that are listed in the physics literature as so-called brane-tilings in the context of quiver gauge theories.
Keywords:Dessin d’enfants  Belyi covering  Bipartite graphs  Gauge theories  Elliptic curves  Isogenies
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