Thu, 25 Apr 2024
16:00
Lecture Room 4, Mathematical Institute

The leading constant in Malle's conjecture

Dan Loughran
(University of Bath)
Abstract

A conjecture of Malle predicts an asymptotic formula for the number of number fields with given Galois group and bounded discriminant. Malle conjectured the shape of the formula but not the leading constant. We present a new conjecture on the leading constant motivated by a version for algebraic stacks of Peyre's constant from Manin's conjecture. This is joint work with Tim Santens.

A sharp isoperimetric-type inequality for Lorentzian spaces satisfying timelike Ricci lower bounds
Cavalletti, F Mondino, A (08 Jan 2024)
Grothendieck lines in 3d $\mathcal{N}=2$ SQCD and the quantum K-theory of the Grassmannian
Closset, C Khlaif, O (13 Sep 2023)
Symmetries and charges in Weyl-Fefferman-Graham gauge
Ciambelli, L Delfante, A Ruzziconi, R Zwikel, C Physical Review D volume 108 issue 12 126003 (15 Dec 2023)
Predicting radiotherapy patient outcomes with real-time clinical data using mathematical modelling
Browning, A Lewin, T Baker, R Maini, P Moros, E Caudell, J Byrne, H Enderling, H Bulletin of Mathematical Biology volume 86 issue 2 (18 Jan 2024)
Single cell spatial analysis of lungs from patients with fatal COVID-19 reveals a cellular network marked by inflammatory foci of immature neutrophil and CD8 T cells localised to alveolar progenitor cells
Weeratunga, P Denney, L Bull, J Repapi, E Sergeant, M Vuppusetty, C Byrne, H Taylor, S Ho, L European Respiratory Journal volume 62 issue S67 (27 Oct 2023)
Grothendieck lines in 3d N = 2 SQCD and the quantum K-theory of the Grassmannian
Closset, C Khlaif, O Journal of High Energy Physics volume 2023 issue 12 82 (12 Dec 2023)
Fri, 08 Mar 2024

12:00 - 13:00
Quillen Room

Another Flavour of String Topology

Joe Davies
(University of Oxford)
Abstract

String topology is an umbrella under which lives a family of algebraic structures on the homology of the (compact-open) loop space of a closed smooth manifold, M. Of great interest are the string product and coproduct, in view of the failure of the latter to be a homotopy invariant. We will discuss some existing algebraic and geometric perspectives on these operations, and give some examples that probe the extent to which the string coproduct fails to be a homotopy invariant. We will sketch an alternative point of view on string topology as the study of the derived bornological smooth loop stack and explain why this is a promising model for the observed phenomena of string topology.

Fri, 23 Feb 2024

12:00 - 13:00
Quillen Room

Homotopy type of SL2 quotients of simple simply connected complex Lie groups

Dylan Johnston
(University of Warwick)
Abstract
We say an element X in a Lie algebra g is nilpotent if ad(X) is a nilpotent operator. It is known that G_{ad}-orbits of nilpotent elements of a complex semisimple Lie algebra g are in 1-1 correspondence with Lie algebra homomorphisms sl2 -> g, which are in turn in 1-1 correspondence with Lie group homomorphisms SL2 -> G.
Thus, we may denote the homogeneous space obtained by quotienting G by the image of a Lie group homomorphism SL2 -> G by X_v, where v is a nilpotent element in the corresponding G_{ad}-orbit.
In this talk we introduce some algebraic tools that one can use to attempt to classify the homogeneous spaces, X_v, up to homotopy equivalence.
Thu, 22 Feb 2024
18:00
The Auditorium, Citigroup Centre, London, E14 5LB

Frontiers in Quantitative Finance: Statistical Predictions of Trading Strategies in Electronic Markets

Prof Samuel N Cohen
Abstract

We build statistical models to describe how market participants choose the direction, price, and volume of orders. Our dataset, which spans sixteen weeks for four shares traded in Euronext Amsterdam, contains all messages sent to the exchange and includes algorithm identification and member identification. We obtain reliable out-of-sample predictions and report the top features that predict direction, price, and volume of orders sent to the exchange. The coefficients from the fitted models are used to cluster trading behaviour and we find that algorithms registered as Liquidity Providers exhibit the widest range of trading behaviour among dealing capacities. In particular, for the most liquid share in our study, we identify three types of behaviour that we call (i) directional trading, (ii) opportunistic trading, and (iii) market making, and we find that around one third of Liquidity Providers behave as market markers.

This is based on work with Álvaro Cartea, Saad Labyad, Leandro Sánchez-Betancourt and Leon van Veldhuijzen. View the working paper here.
 

Attendance is free of charge but requires prior online registration. To register please click here.

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