Forthcoming Seminars
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Thu, 05/11/2009 11:00 |
Alfonso Castrejon Pita (AOPP University of Oxford) |
Applied Dynamical Systems and Inverse Problems Seminar  |
DH 3rd floor SR |
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Thu, 05/11/2009 11:00 |
M. Bays (Oxford) |
Advanced Logic Class |
SR2 |
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Thu, 05/11/2009 12:00 |
Peter Arndt (Göttingen / Cambridge) |
Junior Geometry and Topology Seminar |
SR1 |
| The spectrum of the integers is an affine scheme which number theorists would like to complete to a projective scheme, adding a point at infinity. We will list some reasons for wanting to do this, then gather some hints about what properties the completed object might have. In particular it seems that the desired object can only exist in some setting extending traditional algebraic geometry. We will then present the proposals of Durov and Shai Haran for such extended settings and the compactifications they construct. We will explain the close relationship between both and, if time remains, relate them to a third compactification in a third setting, proposed by Toen and Vaquie. | |||
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Thu, 05/11/2009 14:00 |
Dr. Joris van Deun (University of Antwerp and University of Oxford) |
Computational Mathematics and Applications |
3WS SR |
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Thu, 05/11/2009 14:30 |
Erik Darpo (Oxford/Uppsala) |
Representation Theory Seminar |
L3 |
| The transformation algebra of an algebra A is the subalgebra of the algebra of linear endomorphisms of A generated by all left and right multiplications with elements in A. It was introduced by Albert as a part of an effort to create a unified structure theory for non-associative algebras. One problem with the transformation algebra is that it is a very crude invariant for general algebras. In the talk, I shall suggest a way to compensate for this and show that by adding certain information, the transformation algebra can be used to give a complete picture of the category of unital division algebras of fixed (finite) dimension over a field. | |||
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Thu, 05/11/2009 16:00 |
Dr Alan Lauder (Oxford) |
Number Theory Seminar |
L3 |
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Thu, 05/11/2009 16:30 |
Pascale Aussillous (Polytech Marseille) |
Differential Equations and Applications Seminar |
DH 1st floor SR |
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Thu, 05/11/2009 17:00 |
Anand Pillay (Leeds) |
Logic Seminar |
L3 |
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Fri, 06/11/2009 00:00 |
Mathematical Biology and Ecology Seminar |
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Fri, 06/11/2009 10:00 |
Pascale Aussillous (Polytech Marseille) |
Industrial and Interdisciplinary Workshops |
DH 1st floor SR |
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Fri, 06/11/2009 11:45 |
Sylvain Deville (Saint Gobain) |
Industrial and Interdisciplinary Workshops |
DH 1st floor SR |
| Understanding the critical parameters controlling the stability of solidification interfaces in colloidal systems is a necessary step in many domains were the freezing of colloids is present, such as materials science or geophysics. What we understand so far of the solidification of colloidal suspensions is derived primarily from the analogies with dilute alloys systems, or the investigated behaviour of single particles in front of a moving interface and is still a subject of intense work. A more realistic, multi-particles model should account for the particles movement, the various possible interactions between the particles and the multiple interactions between the particles and the solid/liquid cellular interface. In order to bring new experimental observations, we choose to investigate the stability of a cellular interface during directional solidification of colloidal suspensions by using X-ray radiography and tomography. I will present recent experimental results of ice growth (ice lenses) and particle redistribution observations, their implications, and open the discussion regarding the limitations of the technique and the potential for further progress in the field using this approach. | |||
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Fri, 06/11/2009 12:00 |
Matthew Bullimore (Oxford) |
Twistor Workshop |
Gibson 1st Floor SR |
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Fri, 06/11/2009 14:30 |
Dr Sylvain Deville (CNRS/Saint-Gobain) |
Mathematical Geoscience Seminar |
DH 3rd floor SR |
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Fri, 06/11/2009 16:30 |
Kit Yates (University of Oxford) |
Junior Applied Mathematics Seminar |
DH 1st floor SR |
| Abstract: Cell migration and growth are essential components of the development of multicellular organisms. The role of various cues in directing cell migration is widespread, in particular, the role of signals in the environment in the control of cell motility and directional guidance. In many cases, especially in developmental biology, growth of the domain also plays a large role in the distribution of cells and, in some cases, cell or signal distribution may actually drive domain growth. There is a ubiquitous use of partial differential equations (PDEs) for modelling the time evolution of cellular density and environmental cues. In the last twenty years, a lot of attention has been devoted to connecting macroscopic PDEs with more detailed microscopic models of cellular motility, including models of directional sensing and signal transduction pathways. However, domain growth is largely omitted in the literature. In this paper, individual-based models describing cell movement and domain growth are studied, and correspondence with a macroscopic-level PDE describing the evolution of cell density is demonstrated. The individual-based models are formulated in terms of random walkers on a lattice. Domain growth provides an extra mathematical challenge by making the lattice size variable over time. A reaction-diffusion master equation formalism is generalised to the case of growing lattices and used in the derivation of the macroscopic PDEs. | |||
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Mon, 09/11/2009 11:00 |
Valeriy Slastikov (University of Bristol) |
OxPDE Lunchtime Seminar |
Gibson 1st Floor SR |
| We address the effect of extreme geometry on a non-convex variational problem motivated by recent investigations of magnetic domain walls trapped by sharp thin necks. We prove the existence of local minimizers representing geometrically constrained walls under suitable symmetry assumptions on the domains and provide an asymptotic characterization of the wall profile. The asymptotic behavior, which depends critically on the scaling of length and width of the neck, turns out to be qualitatively different from the higher-dimensional case and a richer variety of regimes is shown to exist. | |||
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Mon, 09/11/2009 12:00 |
Amihay Hanany (Imperial College) |
String Theory Seminar |
L3 |
| Brane Tilings give a large class of SCFT's in 3+1 and 2+1 dimensions. In this talk I will discuss several attempt to classify all such models. Statistical properties of these models can be derived using some techniques in number theory. | |||
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Mon, 09/11/2009 14:15 |
Michael Cowling (Birmingham) |
Geometry and Analysis Seminar K-Theory Day |
L3 |
| Lattices in semisimple Lie groups have been studied from the point of view of number theory, algebraic groups, topology and geometry, and geometric group theory. The Fragestellung of one line of investigation is to what extent the properties of the lattice determine, and are determined by, the properties of the group. This talk reviews a number of results about lattices, and in particular looks at Mostow–Margulis rigidity. | |||
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Mon, 09/11/2009 14:15 |
Tom Cass (Oxford) |
Stochastic Analysis Seminar |
Eagle House |
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Mon, 09/11/2009 15:45 |
Ivan Fesenko (Nottingham) |
K-Theory Day Topology Seminar |
L3 |
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Mon, 09/11/2009 15:45 |
Stanislav Smirnov (Université de Genève) |
Stochastic Analysis Seminar |
Eagle House |
