Forthcoming Seminars

Wed, 21/10/2009
11:30 		Peter Pappas (Vassar College) Algebra Kinderseminar Add to calendar ChCh, Tom Gate, Room 2
On the Semisimplicity Problem for Group Rings
The semisimplicity problem is the long-standing conjecture that the group algebra $ KG $ of a $ p' $-group $ G $ over a field $ K $ of characteristic $ p\geqslant 0 $ has zero Jacobson radical. We will discuss recent advances in connection with this problem.
Thu, 22/10/2009
11:00 		V. Solanki (Oxford) Advanced Logic Class Add to calendar SR2
Zariski geometry from Quantum harmonic oscillator
Thu, 22/10/2009
12:00 		Alan Thompson (Oxford) Junior Geometry and Topology Seminar Add to calendar SR1
Degenerations of <2>-polarised K3 surfaces
A <2>-polarised K3 surface admits an embedding into weighted projective space defined by its polarisation. Let X be a family of such surfaces, then one can construct a projective model W of X such that the map from X to W realises this embedding on the general fibre. This talk considers what happens to W when we allow the fibres of the family X to degenerate.
Thu, 22/10/2009
14:00 		Prof. Charalambos Makridakis (University of Crete) Computational Mathematics and Applications Add to calendar 3WS SR
Mesh redistribution algorithms and error control for time-dependent PDEs
Self adjusted meshes have important benefits approximating PDEs with solutions that exhibit nontrivial characteristics. When appropriately chosen, they lead to efficient, accurate and robust algorithms. Error control is also important, since appropriate analysis can provide guarantees on how accurate the approximate solution is through a posteriori estimates. Error control may lead to appropriate adaptive algorithms by identifying areas of large errors and adjusting the mesh accordingly. Error control and associated adaptive algorithms for important equations in Mathematical Physics is an open problem. In this talk we consider the main structure of an algorithm which permits mesh redistribution with time and the nontrivial characteristics associated with it. We present improved algorithms and we discuss successful approaches towards error control for model problems (linear and nonlinear) of parabolic or hyperbolic type.
Thu, 22/10/2009
14:30 		Andrzej Skowronski (Torun, Poland) Representation Theory Seminar Add to calendar L3
Tame symmetric algebras with periodic modules
Thu, 22/10/2009
16:00 		Fernando Rodriguez Villegas (Austin) Number Theory Seminar Add to calendar L3
Computation of the L-series of the quintic
Thu, 22/10/2009
16:30 		Norm Zabusky (Rutgers University) Differential Equations and Applications Seminar Add to calendar DH 1st floor SR
Dynamics of Vesicles: Experiments, Analytics, and Simulations:
An overview of the experiments of Steinbergs group, Theory-and-models and comparison of the applicability of recent reduced models.
Thu, 22/10/2009
17:00 		Zoe Chatzidakis (Université Paris 7) Logic Seminar Add to calendar L3
Canonical bases of types of finite SU-rank
I will speak about the CBP (canonical base property) for types of finite SU-rank. This property first appears in a paper by Pillay and Ziegler, who show that it holds for types of finite rank in differentially closed fields of characteristic 0, as well as in existentially closed difference fields. It is unknown whether this property holds for all finite rank types in supersimple theories. I will first recall the definition of a canonical base, and give some natural examples. I will then  talk about a reduction of the problem (which allows one to extend the Pillay-Ziegler result to existentially closed fields of any characteristic), and finally derive some consequences of the CBP, in particular the UCBP, thus answering a question of Moosa and Pillay.  If time permits, I will show an application of these results to difference   fields.    
Fri, 23/10/2009
11:45 		OCIAM Internal Seminar (Oxford) Industrial and Interdisciplinary Workshops Add to calendar DH 1st floor SR
Anthony Lock and Becky Shipley
Anthony Lock will speak on "A Column Model of Moist Convection".
Fri, 23/10/2009
14:15 		Albert Shiryaev (Steklov) Nomura Seminar Add to calendar DH 1st floor SR
Stochastic version of the rule "Buy and Hold"
For a logarithmic utility function we extend our rezult with Xu and Zhou for case of the geometrical Brownian motion with drift term which depends of the some hidden parameter.
Fri, 23/10/2009
14:30 		Dr Rob Style (Oxford) Mathematical Geoscience Seminar Add to calendar DH 3rd floor SR
Frost flower growth on sea ice
Fri, 23/10/2009
16:30 		Professor Norm Zabusky (Weizmann Institute) Colloquia Add to calendar L2
*My Nonlinear Odyssey : Analytics*, * Simulation & Visualization *
An overview of the early history of the soliton (1960-1970) and equipartition in nonlinear 1D lattices : From Fermi-Pasta-Ulam to Korteweg de Vries, to Nonlinear Schrodinger*…., and recent developments .
Fri, 23/10/2009
16:30 		Yichao Zhu (University of Oxford) Junior Applied Mathematics Seminar Add to calendar DH 1st floor SR
Dislocation dynamics and instability
Dislocation channel-veins and Persist Slip Band (PSB) structures are characteristic configurations in material science. To find out the formation of these structures, the law of motion of a single dislocation should be first examined. Analogous to the local expansion in electromagnetism, the self induced stress is obtained. Then combining the empirical observations, we give a smooth mobility law of a single dislocation. The stability analysis is carried our asymptotically based on the methodology in superconducting vortices. Then numerical results are presented to validate linear stability analysis. Finally, based on the evidence given by the linear stability analysis, numerical experiments on the non-linear evolution are carried out.
Mon, 26/10/2009
12:00 		Joe Conlon (Oxford) String Theory Seminar Add to calendar L3
Gauge Threshold Corrections for Local String Models
Local string models are those where Standard Model degrees of freedom arise on a small region inside a large bulk volume. I study threshold effects on gauge coupling running for such models. The Kaplunovsky-Louis formula for locally supersymmetric gauge theories predicts the unification scale should be the bulk winding mode scale, parametrically large than the string scale where divergences are naively cut off. Analysis of explicit string models on orbifold/orientifold geometries confirms this; the winding mode scale arises from the presence of tadpoles uncancelled in the local model. I briefly discuss phenomenological applications to supersymmetry breaking and gauge coupling unification.
Mon, 26/10/2009
14:15 		Michael Roeckner (Bielefeld University) Stochastic Analysis Seminar Add to calendar Eagle House
Self-Organised Criticality via Stochastic Partial Differential Equations
Mon, 26/10/2009
14:15 		Carlos Simpson (Nice) Geometry and Analysis Seminar Add to calendar L3
Partial opers
Mon, 26/10/2009
15:45 		Alex Coward (Oxford) Topology Seminar Add to calendar L3
Upper bounds onReidemeistermoves
Given any two diagrams of the same knot or link, we provide an explicit upper bound on the number of Reidemeister moves required to pass between them in terms of the number of crossings in each diagram. This provides a new and conceptually simple solution to the equivalence problem for knot and links. This is joint work with Marc Lackenby.

For any corrections/updates to these listings, please contact seminars [-at-] maths [dot] ox [dot] ac [dot] uk.

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