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Department of Mathematical Sciences

Seminar Archives

On this page you can find information about seminars in this and previous academic years, where available on the database.

Pure Maths Colloquium: Aperiodic order, number theory and topology

Presented by James Walton, Durham

27 February 2017 16:00 in CM221

In this talk I shall introduce the field of aperiodic order, a branch of geometry which aims to study infinite patterns which display a great amount of structural order, despite lacking translational symmetry, i.e., without "repeating themselves". These intriguing patterns make for instructive models of "quasicrystals", amongst other physical applications, but I shall show how they alsoarise in areas of pure mathematics. In particular, the properties of a special class of these patterns, called cut-and-project sets, are intimately linked with questions in Diophantine approximation, the area of number theory which investigates quantitatively how rational numbers approximate real numbers. As time permits, I shall also explain the approach to studying aperiodic patterns through topology, via associated moduli spaces of patterns.

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