Forthcoming Seminars

Fri, 11/02/2011
11:15 		Various OCCAM Special Seminar Add to calendar OCCAM Common Room (RI2.28)
OCCAM Group Meeting
  • Laura Gallimore - Modelling Cell Motility
  • Y. M. Lai - Stochastic Synchronization of Neural Populations
  • Jay Newby - Quasi-steady State Analysis of Motor-driven Transport on a 2D Microtubular Network
Fri, 11/02/2011
14:15 		Miklos Rasonyi (Edinburgh University) Nomura Seminar Add to calendar DH 1st floor SR
Behavioural investors in multiperiod markets
Fri, 11/02/2011
16:00 		Yakov Kremnitzer Aspects of Mathematical Foundations of Physics Add to calendar L3
Noncommutative algebraic geometry

There are several different approaches to noncommutative algebraic geometry. I will present one of these approaches. A noncommutative space will be an (abelian) category. I will show how to associate a ringed space to a category. In the case of the category of quasi-coherent sheaves on a scheme this construction will recover the scheme back. I will also give examples coming from quantum groups.

 
Mon, 14/02/2011
12:00 		Volker Braun (Dublin Institute of Advanced Studies) String Theory Seminar Add to calendar L3
To Be Announced
Mon, 14/02/2011
14:15 		David Coupier Stochastic Analysis Seminar Add to calendar Eagle House
Coexistence in the Last Passage Percolation model

Thanks to a Last Passage Percolation model, 3 colored sources are in competition to fill all the positive quadrant N2. There is coexistence when the 3 souces have infected an infinite number of sites.
A coupling between the percolation model and a particle system -namely, the TASEP- allows us to compute the coexistence probability.
Mon, 14/02/2011
15:45 		Martin Markl (Academy of Sciences of the Czech Republic) Topology Seminar Add to calendar L3
Deformations of algebras and their diagrams
Mon, 14/02/2011
15:45 		Pierre Tarres Stochastic Analysis Seminar Add to calendar Eagle House
Brownian Polymers
We consider a process $ X_t\in\R^d $, $ t\ge0 $, introduced by Durrett and Rogers in 1992 in order to model the shape of a growing polymer; it undergoes a drift which depends on its past trajectory, and a Brownian increment. Our work concerns two conjectures by these authors (1992), concerning repulsive interaction functions $ f $ in dimension $ 1 $ ($ \forall x\in\R $, $ xf(x)\ge0 $). We showed the first one with T. Mountford (AIHP, 2008, AIHP Prize 2009), for certain functions $ f $ with heavy tails, leading to transience to $ +\infty $ or $ -\infty $ with probability $ 1/2 $. We partially proved the second one with B. Tóth and B. Valkó (to appear in Ann. Prob. 2011), for rapidly decreasing functions $ f $, through a study of the local time environment viewed from the particule: we explicitly display an associated invariant measure, which enables us to prove under certain initial conditions that $ X_t/t\to_{t\to\infty}0 $ a.s., that the process is at least diffusive asymptotically and superdiffusive under certain assumptions.
Mon, 14/02/2011
17:00 		James Robinson (University of Warwick) Partial Differential Equations Seminar Add to calendar Gibson 1st Floor SR
Numerical verification of regularity for solutions of the 3D Navier-Stokes equations
I will show that one can (at least in theory) guarantee the "validity" of a numerical approximation of a solution of the 3D Navier-Stokes equations using an explicit a posteriori test, despite the fact that the existence of a unique solution is not known for arbitrary initial data. The argument relies on the fact that if a regular solution exists for some given initial condition, a regular solution also exists for nearby initial data ("robustness of regularity"); I will outline the proof of robustness of regularity for initial data in $ H^{1/2} $. I will also show how this can be used to prove that one can verify numerically (at least in theory) the following statement, for any fixed R > 0: every initial condition $ u_0\in H^1 $ with $ \|u\|_{H^1}\le R $ gives rise to a solution of the unforced equation that remains regular for all $ t\ge 0 $. This is based on joint work with Sergei Chernysehnko (Imperial), Peter Constantin (Chicago), Masoumeh Dashti (Warwick), Pedro Marín-Rubio (Seville), Witold Sadowski (Warsaw/Warwick), and Edriss Titi (UC Irivine/Weizmann).
Tue, 15/02/2011
11:00 		Jari Fowkes (Mathematics (Oxford)) Applied Dynamical Systems and Inverse Problems Seminar Add to calendar DH 3rd floor SR
On Optimisation
Tue, 15/02/2011
17:00 		Jim Langley (Nottingham) Functional Analysis Seminar Add to calendar L3
Non-real zeros of real meromorphic functions

This will be mainly a survey talk covering recently-resolved conjectures of Polya and Wiman for entire functions, and progress on extensions to meromorphic functions
Tue, 15/02/2011
17:00 		Prof. Martin Liebeck (Imperial) Algebra Seminar Add to calendar L2
Triangle groups, algebraic groups and rigidity
Wed, 16/02/2011
11:30 		Matt Towers (University of Oxford) Algebra Kinderseminar Add to calendar ChCh, Tom Gate, Room 2
Non-standard analysis
I will give a short introduction to non-standard analysis using Nelson's Internal Set Theory, and attempt to give some interesting examples of what can be done in NSA. If time permits I will look at building models for IST inside the usual ZFC set theory using ultrapowers.
Wed, 16/02/2011
12:45 		Prof. Dr. Ernst Eberlein (Universitaet Freiburg) Nomura Seminar Add to calendar Oxford-Man Institute
To Be Announced

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

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