Fields, Strings and Geometry seminars

These are the research seminars of the Fields, Strings and Geometry Group.

Seminar details

Time and day: Our regular seminar slot is 4pm - 5pm on Tuesdays during term.
Venue: Seminars held on zoom.
Open to: Staff, postgraduate research students and visiting researchers.

Please contact the organiser Andrea Prinsloo by email ( to request the zoom meeting details.

Upcoming seminars

Speaker: Yuta Hamada (APC, Paris Diderot University)
Time and Date: 4pm - 5pm on Tuesday 2 June 2020
Title: Weak Gravity Conjecture from Unitarity and Causality
Abstract: The weak gravity conjecture states that quantum gravity theories have to contain a charged state with a charge-to-mass ratio bigger than unity. By studying unitarity and causality constraints on higher derivative corrections to the charge-to-mass ratio of extremal back holes, we demonstrate that heavy extremal black holes can play the role of the required charged state under several assumptions. In particular, our argument is applicable when the higher spin states Reggeizing graviton exchange are subdominant in the photon scattering. It covers (1) theories with light neutral bosons, and (2) UV completion where the photon comes from open string theory. Our result provides an existence proof of the weak gravity conjecture in a wide class of theories, including generic string theory setups with the dilaton or other moduli stabilized below the string scale.

Speaker: Nabil Iqbal (Durham University)
Time and Date: 4pm - 5pm on Tuesday 16 June 2020
Title: Toward a 3d Ising Model with a weakly coupled string dual
Abstract: It has long been expected that the 3d Ising model can be thought of as a string theory, where one interprets the domain walls that separate up spins from down spins as two-dimensional string worldsheets. I will revisit this “string theory” from the modern point of view of higher form symmetries. The usual Ising Hamiltonian measures the area of these domain walls; as there is no explicit dependence on the genus of the domain walls, it can be thought of as a string theory with string coupling equal to unity. I discuss how to add new local terms to the Ising Hamiltonian that further weight each spin configuration by a factor depending on the genus of the corresponding domain wall, resulting in a new 3d Ising model that has a tunable bare string coupling gs. I will use a combination of analytical and numerical methods to analyze the phase structure of this model as gs is varied. I will also describe statistical properties of the topology of worldsheets and speculate on the prospects of using this new deformation at weak string coupling to find a worldsheet description of the 3d Ising transition.

Speaker: Severin Bunk (University of Hamburg)
Time and Date: 4pm - 5pm on Tuesday 22 September 2020
Title: TBA
Abstract: TBA

Past seminars

Speaker: Ines Aniceto (University of Southampton)
Date: 4pm - 5pm on Tuesday 12 May 2020
Title: Integrable field theories with an interacting massless sector

Speaker: Stefano Speziali (Swansea University)
Date: Tuesday 10 March 2020
Title: Holographic aspects of two- and four-dimensional field theories

Speaker: Silke Klemm (University of Milan)
Date: Tuesday 18 February 2020
Title: Unusual horizon geometries of black holes in gauged supergravity

Speaker: Masanori Hanada (University of Southampton)
Date: Tuesday 3 December 2019
Title: How colours make a black hole

Speaker: Ana Retore (Trinity College Dublin)
Date: Tuesday 19 November 2019
Title: New su(2) × su(2) integrable models

Speaker: Mahdi Godazgar (Queen Mary, University of London)
Date: Tuesday 22 October 2019
Title: Asymptotic charges in gravity

Speaker: Daniel Grumiller (Vienna University of Technology)
Date: Tuesday 15 October 2019
Title: Gravity and holography in lower dimensions

Speaker: Juan Miguel Nieto Garcia (Universidad Complutense de Madrid)
Date: Tuesday 11 June 2019
Title: Recent developments in the AdS3/CFT2 correspondence with mixed flux

Speaker: Giacomo Pope (University of Liverpool)
Date: Tuesday 4 June 2019
Title: From static to cosmological solutions of N=2 supergravity

Speaker: Jaco van Zyl (University of the Witwatersrand)
Date: Tuesday 21 May 2019
Title: On integrable subsectors of AdS/CFT and LLM geometries

Speaker: Ingo Runkel (University of Hamburg)
Date: Tuesday 14 May 2019
Title: Integrability in 2d CFT and line defects

Speaker: Istvan Szecsenyi (City, University of London)
Date: Tuesday 7 May 2019
Title: Entanglement content of quantum particle excitations

Speaker: Alessandro Torrielli (University of Surrey)
Date: Tuesday 26 March 2019
Title: Massless scattering in lower dimensional AdS/CFT

Speaker: Tommaso Macrelli (University of Surrey)
Date: Tuesday 19 March 2019
Title: Finite symmetry groups of two-dimensional toroidal conformal field theories

Speaker: Tomasz Lukowski (University of Hertfordshire)
Date: Tuesday 12 March 2019
Title: Amplituhedron meets Jeffrey-Kirwan residue

Speaker: Alec Barns-Graham (University of Cambridge)
Date: Tuesday 19 February 2019
Title: A superconformal index for hyperKähler cones

Speaker: Andrea Cavaglia (King's College London)
Date: Tuesday 5 February 2019
Title: Towards 3-point functions in N=4 super Yang-Mills theory with the Quantum Spectral Curve

Speaker: Rouven Frassek (Max Planck Institute for Mathematics, Bonn)
Date: Thursday 31 January 2019
Title: Q-operators for rational spin chains

Speaker: Martin Wolf (University of Surrey)
Date: Tuesday 4 December 2018
Title: L-algebras, the BV formalism and classical fields

Speaker: Valentina Forini (City University London)
Date: Tuesday 27 November 2018
Title: Superstring worldsheet beyond perturbation theory

Speaker: Tudor Dimofte (University of California, Davis)
Date: Tuesday 20 November 2018
Title: Higher algebraic structures in supersymmetric QFT

Speaker: Roberto Sisca (University of Surrey)
Date: Tuesday 6 November 2018
Title: The universal geometry of heterotic vacua (part 2)

Speaker: Charles Strickland-Constable (University of Hertfordshire)
Date: Tuesday 6 November 2018
Title: Finite heterotic deformations and holomorphic Courant algebroids

Speaker: Anthony Ashmore (University of Oxford)
Date: Tuesday 30 October 2018
Title: Moduli and obstructions of N=1 heterotic backgrounds.

Speaker: Tristan McLoughlin (Trinity College Dublin)
Date: Tuesday 23 October 2018
Title: A twistor approach to conformal higher spin theory

Speaker: Jock McOrist (University of Surrey)
Date: Tuesday 9 October 2018
Title: The universal geometry of heterotic vacua (part 1)

Speaker: Sebastian Lautz (King's College London)
Date: Tuesday 2 October 2018
Title: All AdS4 and AdS3 supergravity backgrounds with N > 16 supersymmetries: uniqueness and (non-)existence

Speaker: Andrea Fontanella (University of Surrey)
Date: Tuesday 4 September 2018
Title: Black Horizons and Integrable Structures in String Theory

Speaker: Oleg Smolyanov (Moscow State University)
Date: Wednesday 20 June 2018
Title: Hamiltonian method of the second quantization
(Joint seminar with the Dynamical Systems and PDEs Group)

Speaker: Christian Saemann (Heriot-Watt University)
Date: Tuesday 29 May 2018
Title: Symmetries from Derived Brackets in Generalized Geometry and Beyond

Speaker: Jan Gutowski (University of Surrey)
Date: Tuesday 15 May 2018
Title: Highly Supersymmetric AdS Solutions

Speaker: Mario Garcia-Fernandez (Autonomous University of Madrid)
Date: Tuesday 24 April 2018
Title: Canonical metrics on holomorphic Courant algebroids

Speaker: Marc-Antoine Fiset (University of Oxford)
Date: Tuesday 6 March 2018
Title: Heterotic G2 moduli and worldsheet BRST operator

Speaker: Silvia Penati (University of Milano-Bicocca)
Date: Tuesday 20 February 2018
Title: ABJM theory: A Matrix Model for latitude Wilson loops

Speaker: Lorenzo Raspollini (University of Surrey)
Date: Tuesday 13 February 2018
Title: Perturbative Quantisation of Gauge Theories (Part 3)

Speaker: Benjo Fraser (Chulalongkorn University, Bangkok)
Date: Tuesday 9 January 2018
Title: Non-abelian T-duality and coset CFTs

Speaker: Jeff Murugan (University of Cape Town)
Date: Friday 5 January 2018
Title: A 2-dimensional random supersymmetric model with disorder

Speaker: Renzo Ricca (University of Milano-Bicocca)
Date: Tuesday 13 December 2017
Title: Quantifying topological complexity by knot polynomials

Speaker: Luca Cassia (University of Milano-Bicocca)
Date: Tuesday 5 December 2017
Title: 4D N=1,2,3,4 SCFTs on a Riemann Surface

Speaker: Lorenzo Raspollini (University of Surrey)
Date: Tuesday 21 November 2017
Title: Perturbative Quantisation of Gauge Theories (Part 2)

Speaker: Marius de Leeuw (Trinity College, Dublin)
Date: Tuesday 14 November 2017
Title: One- and Two-point functions in AdS/dCFT

Speaker: Lorenzo Raspollini (University of Surrey)
Date: Tuesday 7 November 2017
Title: Perturbative Quantisation of Gauge Theories (Part 1)

Speaker: Oleg Smolyanov (Moscow State University)
Date: Tuesday 31 October 2017
Title: Transformations of Feynman Path Integrals and Quantum Anomalies
(Joint seminar with the Dynamical Systems and PDEs Group)

Speaker: Alexander Schenkel (University of Nottingham)
Date: Tuesday 24 October 2017
Title: The stack of Yang-Mills fields

Speaker: Pau Figueras (Queen Mary, University of London)
Date: Tuesday 10 October 2017
Title: Non-spherically symmetric collapse in asymptotically AdS spacetimes

Speaker: Francesco Ravanini (University of Bologna)
Date: Tuesday 5 September 2017
Title: The ceff-theorem: Irreversibility of RG Flows in 2D Non-unitary QFTs

Speaker: James Lucietti (University of Edinburgh)
Date: Tuesday 13 June 2017
Title: New black holes in five dimensions

Speaker: Roberto Sisca (University of Surrey)
Date: Tuesday 30 May 2017
Title: Connections in heterotic geometry

Speaker: John Huerta (University of Lisbon)
Date: Tuesday 23 May 2017
Title: M-theory from the superpoint

Speaker: Eoin Ó Cólgain (Pohang University of Science and Technology)
Date: Tuesday 14 March 2017
Title: Yang-Baxter sigma-models, conformal twists and NC Yang-Mills

Speaker: Martin Wolf (University of Surrey)
Date: Tuesday 7 March 2017
Title: Higher groupoid bundles and higher gauge theory

Speaker: Jock McOrist (University of Surrey)
Date: Tuesday 28 February 2017
Title: A metric and geometry for heterotic moduli

Speaker: Richard Szabo (Heriot-Watt University)
Date: Monday 27 February 2017
Title: Quantum Geometry and Non-Geometric Backgrounds

Speaker: Alessandro Sfondrini (ETH, Zurich)
Date: Tuesday 14 February 2017
Title: Integrable Bootstrap in AdS/CFT

Speaker: Anne Franzen (University of Lisbon)
Date: Tuesday 7 February 2017
Title: Strong Cosmic Censorship as seen from scalar waves in black hole interiors
(Joint seminar with the Dynamical Systems and PDEs Group)

Speaker: Urs Schreiber (Czech Academy of Sciences, Prague)
Date: Tuesday 6 December 2016
Title: Super Lie n-algebra of fundamental super p-branes

Speaker: Andrea Santi (University of Bologna, and the University of Edinburgh)
Date: Tuesday 29 November 2016
Title: Killing superalgebras and high supersymmetry

Speaker: Cristian Vergu (King’s College, London)
Date: Tuesday 15 November 2016
Title: Ten-dimensional light-like lines, smooth Wilson loops in N = 4 super Yang-Mills and twistors

Speaker: Carlo Meneghelli (Stony Brook University, New York)
Date: Tuesday 8 November 2016
Title: Pre-fundamental representations for the Hubbard model and AdS/CFT

Speaker: Eirik Svanes (Lagrange Institute, Paris)
Date: Tuesday 25 October 2016
Title: Recent Advances in Heterotic Moduli

Speaker: Andrew Royston (Texas A&M University)
Date: Tuesday 11 October 2016
Title: N = 2 super Yang-Mills and the Geometry of Magnetic Monopoles

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Department of Mathematics
AA Building, floor 4
University of Surrey