Research lectures, seminars and events
The events listed in this area are research seminars, workshops and lectures hosted by Durham University departments and research institutes. If you are not a member of the University, but wish to enquire about attending one of the events please contact the organiser or host department.
|November 2018||January 2019|
Events for 10 December 2018
Research Seminar: Ethnic disproportionality in the identification of Social, Emotional and Mental Health (SEMH) Needs: A national longitudinal cohort age 4-11
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Dr Alison Jack: Refiguring the Prodigal Son in Literature in English: Five Hundred Years of Literary Homecomings
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There is an (easy) analogue of the prime number theorem (PNT) for polynomials over a finite field k with q elements: there are approximately q^d/d monic irreducible polynomials of degree d. You might also have counted the number of invertible matrices of fixed size n over k by “picking a basis”: (q^n-1)(q^n-q)…. In the context of this talk, both of these results are related to the study of the dynamics of the Frobenius operator (“raising to the power q”) on, respectively, the affine line and the algebraic group GL(n) over the algebraic closure K of k. For the first result, we count “prime” orbits; for the second, we count fixed points.
The general framework of our work is that of counting orbits and fixed points of endomorphisms of algebraic groups over K. We show there is a sharp dichotomy: either the associated dynamical zeta function is a rational function (like the Weil zeta function, e.g. in the above examples), and an analogue of PNT holds; or the zeta function is transcendental, and the set of limit points in PNT is uncountable. In the latter case, the number of fixed points of the k-th iteratre involves p-adic properties of k. The distinction is very similar to dichotomies observed in measurable dynamics (mixing/non-mixing). Sometimes, the dichotomy has a clear geometric interpretation (e.g., on abelian varieties, and on reductive groups, in relation to a famous formula of Steinberg generalizing the count for GL(n)). [Joint work with Jakub Byszewski and Marc Houben.]
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The KKLT (Kachru, Kallosh, Linde, Trivedi) construction of de-Sitter vacua (hep-th/0301240 ~ 3000 citations) is very important for string theory. One key ingredient of the KKLT paper is the result from a previous paper (hep-th/0112197) by KPV (Kachru, Pearson, Verlinde). However, the KPV paper is highly controversial so the KKLT construction is thrown into question as well. In this talk, I’ll (schematically) consider the debate around KPV and talk about our recent paper (1812.01067) on the topic. I’ll present our results, which I believe greatly affect the KPV debate, and also the conceptual ideas of our analysis.
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IAS Fellow's Public Lecture - The Strange and Prophetic Observations of Hootum the Owl : colonial modernity and the making of the post modern novel in India
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