Optimal execution and speculation with trade signals
 Bank, P Cartea, A Koerber, L Finance and Stochastics
Thu, 27 Nov 2025

14:00 - 15:00
Lecture Room 3

The Role of Inexactness in Krylov Subspace Regularization for Inverse Problems

Dr Malena Sabate Landman
((Mathematical Institute University of Oxford))
Abstract

Linear discrete inverse problems arise in many areas of science and engineering, from medical imaging and geophysics to atmospheric modelling. Their numerical solution often relies on iterative algorithms, particularly Krylov subspace methods, that can efficiently handle large-scale, ill-posed systems. In many practical settings, however, exact computations of matrix–vector products, preconditioners, or right-hand sides are either infeasible or unnecessary, leading to inexact iterations. This talk explores the interplay between inexactness and the regularizing behaviour of Krylov subspace methods for inverse problems. We discuss how approximate computations influence the regularization effect inherent in early iterations, as well as  semiconvergence, and how controlled inexactness may be exploited to improve computational efficiency. The aim is to provide a broad perspective on recent insights and open questions at the interface of inverse problems, iterative solvers, and computational inexactness.

Diffusive dynamics and electrochemical regulation of weak polyelectrolytes across liquid interfaces
 Celora, G Blossey, R Muench, A Wagner, B Physical Review Research
Tue, 11 Nov 2025
13:00
L2

The Cosmological Grassmannian

Guilherme Leite Pimentel
(Pisa SNS)
Abstract
I will show how a Grassmannian turns out to be the natural kinematic space for describing correlation functions of massless spinning particles, in four dimensional (Anti)-de Sitter space.
In this kinematic space, tree-level cosmological correlators factorize in a simple way and can be bootstrapped with rather ease, revealing some hidden beauty.

Boost your research impact with The Conversation

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Session 1: Introduction to Writing for The Conversation

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Equali-Tea on 1 July

The Interim Head of the Equality and Diversity Unit, Marilyn Verghis, is delighted to invite staff and students to an Equali-tea on Tuesday, 1 July from 10.30-11.30am. The tea will be hosted by the Department of Statistics, 24-29 St Giles.

Staff briefings on congestion charge proposals

An online staff briefing on proposals for a temporary congestion charge in Oxford have been arranged with the County Council. This will take place at 11.30am-12.30pm on Monday 30 June. Colleagues interested in the proposals and their potential impact are welcome to join using the Teams links provided.

The mathematics of serocatalytic models with applications to public health data
 Kamau, E Chen, J Bajaj, S Torres, N Creswell, R Pavlich-Mariscal, J Donnelly, C Cucunubá, Z Lambert, B Statistics in Medicine volume 44 issue 15-17 (22 Jul 2025)

Help shape how the University communicates with staff

Following a University-wide communications survey in January 2025, the Internal Communications team is inviting staff to take part in follow-up discussion groups or share their views through a short, anonymous questionnaire during July. The aim is to gather more nuanced feedback that will help shape how the University communicates with staff in the future.

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