Mar 18 (Wed)
13:00 MCS3055 E&PChristian Lawson-Perfect (Newcastle): Accessibility of Maths E-assessment
13:00 zoom A&CZhongjie Huang (University of Chinese Academy of Sciences): Spinning Mellin Amplitudes
In this talk, I will show how to define Mellin amplitudes for conformal correlators involving arbitrary spinning bosonic operators. The strategy is to perform a discrete Mellin transformation on all scalar products containing polarization vectors, such that each polarization vector can be interpreted as the position of a fictitious scalar operator. I will also establish the general pole structures and factorization properties of these spinning Mellin amplitudes.
Venue: zoom
Online: https://teams.microsoft.com/meet/36466301429317?p=TErTcWVJUdglpu8Uss
Mar 19 (Thu)
13:00 MCS2068 G&TAndy Wand (Glasgow): Non-positive open books of Stein fillable contact 3-manifolds
We will discuss motivation for and approaches to the
question of when the monoid in the mapping class group of a surface with
boundary corresponding to monodromies of open book decompositions of
Stein fillable contact 3-manifolds differs from the monoid of mapping
classes which admit factorizations into positive Dehn twists. In
particular, combining new(ish) results with previous work of several
people, we give a complete solution to this problem, showing that the
monoids coincide only for planar surfaces. This is joint work with
Vitalijs Brejevs.
Venue: MCS2068
14:00 MCS2068 ProbDaniel Kious (University of Bath): Sharp threshold for the ballisticity of the random walk on the exclusion process
In this talk, I will overview works on random walks in dynamical random environments. I will recall a result obtained in collaboration with Hilario and Teixeira and then I will focus on a work with ConchonKerjan and Rodriguez. Our main interest is to investigate the long-term behavior of a random walker evolving on top of the simple symmetric exclusion process (SSEP) at equilibrium, with density in [0,1]. At each jump, the random walker is subject to a drift that depends on whether it is sitting on top of a particle or a hole. We prove that the speed of the walk, seen as a function of the density, exists for all density but at most one, and that it is strictly monotonic. We will explain how this can be seen as a sharpness result and provide an outline of the proof, whose general strategy is inspired by techniques developed for studying the sharpness of strongly-correlated percolation models.
Venue: MCS2068
Mar 20 (Fri)
13:00 MCS0001 HEPMDonal O'Connell (Edinburgh University): Supertranslations are Soft Dressings
In quantum field theories, the definition of a single particle state is ambiguous when there is no mass gap. I will discuss how this ambiguity for a single massive particle, in the regime of validity of the classical approximation, is intimately connected to large gauge transformations of classical theories. I will in particular discuss general BMS supertranslations from this point of view, as well as implications for classical observables such as impulses and waveforms.
Venue: MCS0001
Mar 23 (Mon)
13:00 MCS2068 StatRasa Remenyte-Prescott (Nottingham): Reliability and Efficiency Modelling in Healthcare
The talk will give an overview of current research needs in reliability and efficiency modelling in healthcare, with a focus on using approaches of engineering risk and system reliability analysis. It will then focus on some current projects at the University of Nottingham and their outcomes, with a focus on Newborn Life Support (NLS) procedure, and will discuss future avenues for research in the areas of healthcare applications. The talk will also give a brief overview of activities in the Resilience Engineering Research Group and open a discussion for potential future collaboration opportunities.
Venue: MCS2068
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Contact: arthur.lipstein@durham.ac.uk
Mar 18 13:00 Zhongjie Huang (University of Chinese Academy of Sciences): Spinning Mellin Amplitudes
In this talk, I will show how to define Mellin amplitudes for conformal correlators involving arbitrary spinning bosonic operators. The strategy is to perform a discrete Mellin transformation on all scalar products containing polarization vectors, such that each polarization vector can be interpreted as the position of a fictitious scalar operator. I will also establish the general pole structures and factorization properties of these spinning Mellin amplitudes.
Venue: zoom
Usual Venue: MCS3070
Contact: andrew.krause@durham.ac.uk
No upcoming seminars have been scheduled (not unusual outside term time).
Usual Venue: MCS2068
Contact: herbert.gangl@durham.ac.uk
No upcoming seminars have been scheduled (not unusual outside term time).
Usual Venue: OC218
Contact: mohamed.anber@durham.ac.uk
For more information, see HERE.
No upcoming seminars have been scheduled (not unusual outside term time).
Usual Venue: MCS3052
Contact: andrew.krause@durham.ac.uk
Mar 18 13:00 Christian Lawson-Perfect (Newcastle): Accessibility of Maths E-assessment
Ill give a brief introduction to the topic of accessibility, then talk about particular access considerations for mathematical e-assessment, based on years of experience developing and supporting mathematical e-assessment. Seminar slides: https://numbas.org.uk/talks/durham-2026-03-18/
Venue: MCS3055
Usual Venue: MCS2068
Contact: fernando.galaz-garcia@durham.ac.uk
Mar 19 13:00 Andy Wand (Glasgow): Non-positive open books of Stein fillable contact 3-manifolds
We will discuss motivation for and approaches to the
question of when the monoid in the mapping class group of a surface with
boundary corresponding to monodromies of open book decompositions of
Stein fillable contact 3-manifolds differs from the monoid of mapping
classes which admit factorizations into positive Dehn twists. In
particular, combining new(ish) results with previous work of several
people, we give a complete solution to this problem, showing that the
monoids coincide only for planar surfaces. This is joint work with
Vitalijs Brejevs.
Venue: MCS2068
Apr 02 13:00 Thiago de Paiva (Peking University): A simpler braid description for all links in the 3-sphere
By Alexander's theorem, every link in the 3-sphere can be
represented as the closure of a braid. Lorenz links and twisted torus
links are two families that have been extensively studied and are well
described in terms of braids. In this talk, we present a natural
generalization of Lorenz links and twisted torus links that produces all
links in the 3-sphere, providing a simpler braid description for every
link in the 3-sphere.
Venue: MCS2068
Apr 30 13:00 Anthea Monod (Imperial): TBA
Usual Venue: MCS0001
Contact: p.e.dorey@durham.ac.uk,enrico.andriolo@durham.ac.uk,tobias.p.hansen@durham.ac.uk
Mar 20 13:00 Donal O'Connell (Edinburgh University): Supertranslations are Soft Dressings
In quantum field theories, the definition of a single particle state is ambiguous when there is no mass gap. I will discuss how this ambiguity for a single massive particle, in the regime of validity of the classical approximation, is intimately connected to large gauge transformations of classical theories. I will in particular discuss general BMS supertranslations from this point of view, as well as implications for classical observables such as impulses and waveforms.
Venue: MCS0001
Mar 27 13:00 Sean Hartnoll (Cambridge University): TBA
Usual Venue: MCS2068
Contact: tyler.helmuth@durham.ac.uk,oliver.kelsey-tough@durham.ac.uk
Mar 19 14:00 Daniel Kious (University of Bath): Sharp threshold for the ballisticity of the random walk on the exclusion process
In this talk, I will overview works on random walks in dynamical random environments. I will recall a result obtained in collaboration with Hilario and Teixeira and then I will focus on a work with ConchonKerjan and Rodriguez. Our main interest is to investigate the long-term behavior of a random walker evolving on top of the simple symmetric exclusion process (SSEP) at equilibrium, with density in [0,1]. At each jump, the random walker is subject to a drift that depends on whether it is sitting on top of a particle or a hole. We prove that the speed of the walk, seen as a function of the density, exists for all density but at most one, and that it is strictly monotonic. We will explain how this can be seen as a sharpness result and provide an outline of the proof, whose general strategy is inspired by techniques developed for studying the sharpness of strongly-correlated percolation models.
Venue: MCS2068
Usual Venue: MCS3070
Contact: joe.thomas@durham.ac.uk
No upcoming seminars have been scheduled (not unusual outside term time).
Usual Venue: MCS2068
Contact: hyeyoung.maeng@durham.ac.uk,andrew.iskauskas@durham.ac.uk
Mar 23 13:00 Rasa Remenyte-Prescott (Nottingham): Reliability and Efficiency Modelling in Healthcare
The talk will give an overview of current research needs in reliability and efficiency modelling in healthcare, with a focus on using approaches of engineering risk and system reliability analysis. It will then focus on some current projects at the University of Nottingham and their outcomes, with a focus on Newborn Life Support (NLS) procedure, and will discuss future avenues for research in the areas of healthcare applications. The talk will also give a brief overview of activities in the Resilience Engineering Research Group and open a discussion for potential future collaboration opportunities.
Venue: MCS2068
