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Durham University

Research & business

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.


 

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Events for 14 November 2019

Antibacterial Clay Therapy - Workshop: Sociology of AMR

10:00am to 4:00pm, Seminar Room, Institute of Advanced Study

Contact kimberly.jamie@durham.ac.uk for more information about this event.


Drew Duffield: The Wildness and Local Structure of Automorphic Lie Algebras

1:00pm, CM301

Automorphic Lie algebras are a class of infinite-dimensional Lie algebras that are closely related to a wide variety of algebraic structures that appear in integrable systems theory, mathematical physics and geometry. They can be viewed as a certain generalisation of the well-studied (twisted) loop algebras and current algebras. It can often be difficult to immediately gain an intuitive understanding of the algebraic structure behind an automorphic Lie algebra. However, this task can be made easier using techniques in representation theory. Associated to an automorphic Lie algebra is a commutative algebra of functions. Studying automorphic Lie algebras via evaluation maps parameterised by the representations of the associated commutative algebra provides a descending chain of ideals of the automorphic Lie algebra. A detailed study of this chain of ideals immediately shows that the representation theory of automorphic Lie algebras is wild, and enables us to describe the local Lie structure of the automorphic Lie algebra.

Contact mark.a.powell@durham.ac.uk, andrew.lobb@durham.ac.uk, wilhelm.klingenberg@durham.ac.uk for more information about this event.


Jean-Claude Cuenin: Improved eigenvalue bounds for Schrödinger operators with slowly decaying potentials

2:00pm, CM301

We extend a result of Davies and Nath [1] on the location of eigenvalues of Schrödinger operators $-\Delta+V$ with slowly decaying complex-valued potentials to higher dimensions. We also discuss examples related to the Laptev--Safronov conjecture [2], which stipulates that the absolute value of any complex eigenvalue can be bounded in terms of the $L^q$ norm of $V$, for a certain range of exponents $q$. The talk is based on [3].

1

Davies, E. B. and Nath, J. Schrödinger operators with slowly decaying potentials J. Comput. Appl. Math., 2002, 148, 1-28

2

Laptev, A. and Safronov, O. Eigenvalue estimates for Schrödinger operators with complex potentials Comm. Math. Phys., 2009, 292, 29-54

3

Cuenin, J.-C. Improved eigenvalue bounds for Schr\"odinger operators with slowly decaying potentials arXiv e-prints, 2019, arXiv:1904.03954

Contact djoko.wirosoetisno@durham.ac.uk for more information about this event.


Marek Schoenherr: The electroweak sector of the Standard Model and precision calculations for the LHC

2:00pm, OC218

The LHC has completed its second run at the unprecedented energy of 13 TeV and prepares for the upcoming Run-3, with the High-Luminosity upgrade on the horizon. While the search for new physics continues in the soon-to-be-accessible high-energy regime, precision measurements of inclusive observables are likewise on the experiments physics programme. In this presentation I will review the role and properties of the electroweak half of the Standard Model and detail how its precise understanding is crucial to the success of both objectives in these seemingly so very dissimilar regimes.

Contact stefano.cremonesi@durham.ac.uk, p.e.dorey@durham.ac.uk for more information about this event.


Matthias Taeufer: A robust initial scale estimate and localization at band edges of the Anderson model

4:00pm, CM107

We prove that Anderson localization near band edges of ergodic continuum
random Schroedinger operators with periodic background potential in in
dimension two and larger is universal.
In particular, Anderson localization holds without extra decay
assumptions on the random variables and independently of regularity or
degeneracy of the Floquet eigenvalues of the background operator.
Our approach is based on a robust initial scale estimate the proof of
which avoids Floquet theory altogether and uses instead an interplay
between quantitative unique continuation and large deviation estimates.
Furthermore, our reasoning is sufficiently flexible to prove this
initial scale estimate in a non-ergodic setting, which promises to be an
ingredient for understanding band edge localization also in these
situations.

Based on joint work with Albrecht Seelmann (TU Dortmund).

Contact sunil.chhita@durham.ac.uk for more information about this event.