Forthcoming Seminars
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Mon, 27/10/2008 16:00 |
Damiano Testa (University of Oxford) |
Junior Number Theory Seminar  |
SR1 |
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Mon, 27/10/2008 17:00 |
Peter Constantin (Chicago) |
Partial Differential Equations Seminar |
Gibson 1st Floor SR |
| I will talk about recent work concerning the Onsager equation on metric spaces. I will describe a framework for the study of equilibria of melts of corpora – bodies with finitely many degrees of freedom, such as stick-and-ball models of molecules. | |||
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Tue, 28/10/2008 12:00 |
Christopher Mudry (PSI, visiting Newton Institute) |
Quantum Field Theory Seminar |
L3 |
| The problem of Anderson localization in graphene has generated a lot of renewed attention since graphene flakes have been accessible to transport and spectroscopic probes. The popularity of graphene derives from it realizing planar Dirac fermions. I will show under what conditions disorder for planar Dirac fermions does not result in localization but rather in a metallic state that might be called a topological metal. | |||
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Tue, 28/10/2008 14:30 |
Andy Twigg (Oxford) |
Combinatorial Theory Seminar |
L3 |
| Given a graph G, we are asked to preprocess G and compute labels L(u) for vertices such that given L(x) and L(y) we can efficiently answer d_G(x,y). I will describe some results in this area and some open problems. | |||
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Tue, 28/10/2008 15:45 |
Andras Szenes (Université de Genève) |
Algebraic and Symplectic Geometry Seminar |
L3 |
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Tue, 28/10/2008 16:30 |
Dr Stephen Peppin (Oxford) |
Geophysical and Nonlinear Fluid Dynamics Seminar |
Dobson Room, AOPP |
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Tue, 28/10/2008 17:00 |
Michael Vaughan-Lee (Oxford) |
Algebra Seminar |
L2 |
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Wed, 29/10/2008 11:30 |
Richard Williamson (University of Oxford) |
Algebra Kinderseminar |
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Thu, 30/10/2008 11:00 |
Laura Campbell (University of Oxford) |
Applied Dynamical Systems and Inverse Problems Seminar |
Gibson 1st Floor SR |
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Thu, 30/10/2008 12:00 |
Steven Rayan (Oxford) |
Junior Geometry and Topology Seminar |
SR1 |
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Thu, 30/10/2008 13:00 |
Xunyu Zhou (Oxford) |
Mathematical Finance Internal Seminar |
DH 1st floor SR |
| A new portfolio choice model in continuous time is formulated and solved, where the quantile function of the terminal cash flow, instead of the cash flow itself, is taken as the decision variable. This formulation covers and leads to solutions to many existing and new models including expected utility maximisation, mean-variance, goal reaching, VaR and CVaR, Yaari's dual model, Lopes' SP/A model, and behavioural model under prospect theory. | |||
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Thu, 30/10/2008 14:00 |
Prof Simon Tavener (Colorado State University) |
Computational Mathematics and Applications |
Comlab |
| Operator decomposition methods are an attractive solution strategy for computing complex phenomena involving multiple physical processes, multiple scales or multiple domains. The general strategy is to decompose the problem into components involving simpler physics over a relatively limited range of scales, and then to seek the solution of the entire system through an iterative procedure involving solutions of the individual components. We analyze the accuracy of an operator decomposition finite element method for a conjugate heat transfer problem consisting of a fluid and a solid coupled through a common boundary. We derive accurate a posteriori error estimates that account for both local discretization errors and the transfer of error between fluid and solid domains. We use these estimates to guide adaptive mesh refinement. In addition, we show that the order of convergence of the operator decomposition method is limited by the accuracy of the transferred gradient information, and how a simple boundary flux recovery method can be used to regain the optimal order of accuracy in an efficient manner. This is joint work with Don Estep and Tim Wildey, Department of Mathematics, Colorado State University. | |||
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Thu, 30/10/2008 14:30 |
Rudolf Tange (York) |
Representation Theory Seminar |
L3 |
| It is well-known that there is a strong link between the representation theories of the general linear group and the symmetric group over the complex numbers. J.A.Green has shown that this in also true over infinite fields of positive characteristic. For this he used the Schur functor as introduced by I.Schur in his PhD thesis. In this talk I will show that one can do the same thing for the symplectic group and the Brauer algebra. This is joint work with S.Donkin. As a consequence we obtain that (under certain conditions) the Brauer algebra and the symplectic Schur algebra in characteristic p have the same block relation. Furthermore we obtain a new proof of the description of the blocks of the Brauer algebra in characteristic zero as obtained by Cox, De Visscher and Martin. | |||
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Thu, 30/10/2008 16:00 |
Tejaswi Navilarekallu (Amsterdam) |
Number Theory Seminar |
L3 |
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Thu, 30/10/2008 16:30 |
Chris Bell (Oxford) |
Differential Equations and Applications Seminar |
DH 1st floor SR |
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Thu, 30/10/2008 17:00 |
Ken Dykema |
Functional Analysis Seminar |
L2 |
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Thu, 30/10/2008 17:00 |
Ken Dykema (Texas A & M) |
Functional Analysis Seminar |
L2 |
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Thu, 30/10/2008 17:00 |
Jochen Koenigsmann (Oxford) |
Logic Seminar |
L3 |
| I will present a universal definition of the integers in the field of rational numbers, building on work discussed by Bjorn Poonen in his seminar last term. I will also give, via model theory, a geometric criterion for the non-diophantineness of Z in Q. | |||
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Fri, 31/10/2008 11:45 |
Gabor Csanyi and others |
OxMOS Workshop/Meeting/Lecture |
Gibson 1st Floor SR |
| 11.30 Coffee (1st floor Gibson Common Room). 11.45 Atomistics and Dislocations - Gabor Csanyi (followed by a short time for discussion). 13.00 Sandwich lunch (1st floor Common Room). 13.45 (approx) Persistent Slip Bands (PSB's) - Angus Wilkinson and/or Jon Chapman. 14:30 Discussion. | |||
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Fri, 31/10/2008 11:45 |
TBA |
Industrial and Interdisciplinary Workshops |
Gibson 1st Floor SR |
