# All Upcoming Events

On Friday at 15:30 in Martin Wood Lecture Theatre, Clarendon Laboratory, Parks Road, a seminar in
the Colloquia Series Seminars series:

Prof Theodore (Ted) Shepherd (University of Reading)

Atmospheric Circulation and Climate Change

On Monday at 12:00 in L3, a seminar in
the String Theory series:

Sakura Schafer-Nameki (Oxford)

M5-branes and Matroshkas

*We study M5-branes on elliptically fibered Kaehler three-folds, which upon dimensional reduction give rise to N=4 SYM with varying complexified coupling \tau. Singularities in the fiber correspond to 2d surface defects, around which the N=4 theory undergoes an SL(2,Z) monodromy. Furthermore, there are point-like intersections of 2d defects. We provide a complete description of this 6d-4d-2d-0d 'Matroshka-setup'. Work to appear with Benjamin Assel (CERN).*

**Further information:**
On Monday at 14:15 in L4, a seminar in
the Geometry and Analysis series:

Dario Beraldo (Oxford)

Automorphic gluing in geometric Langlands via sheaves of categories with Hochschild cochains action

On Tuesday at 12:00 in L4, a seminar in
the Quantum Field Theory series:

Robert Schabinger (Trinity College Dublin)

On The Four-Loop Form Factors Of Massless QCD

*In this talk, we discuss an ongoing calculation of the four-loop form factors in massless QCD. We begin by discussing our novel approach to the calculation in detail. Of particular interest are a new polynomial-time integration by parts reduction algorithm and a new method to algebraically resolve the IR and UV singularities of dimensionally-regulated bare perturbative scattering amplitudes. Although not all integral topologies are linearly reducible for the more non-trivial color structures, it is nevertheless feasible to obtain accurate numerical results for the finite parts of the complete four-loop form factors using publicly available sector decomposition programs and bases of finite integrals. Finally, we present first results for the four-loop gluon form factor Feynman diagrams which contain three closed fermion loops.*

**Further information:**
On Tuesday at 14:00 in DWB 501 (Seminar Room), a seminar in
the Holography series:

Lata Kh Joshi (Indian Institute of Technology, Bombay)

Time-Dependent Holographic Spectral Function

On Tuesday at 14:15 in BIPAC Seminar Room, a seminar in
the Cosmology series:

Boris Leistedt (NYU)

Cosmology with modern galaxy surveys: from precision to accuracy

On Tuesday at 15:45 in L4, a seminar in
the Algebraic and Symplectic Geometry series:

Jørgen Rennemo (Oxford)

The global Torelli theorem for cubic 4-folds via derived categories

On Wednesday at 13:15 in N3.12, a seminar in
the Strings Junior series:

Mark Van Loon

Moonshine

On Thursday at 13:00 in Dalitz Institute, DWB, a seminar in
the Particle Phenomenology Forum series:

Cobi Sonnenschein (Tel Aviv University)

Holgraphy inspired stringy hadrons

On Thursday at 15:00 in Martin Wood Lecture Theatre, Clarendon Laboratory, Parks Road, a seminar in
the Colloquia Series Seminars series:

Prof Gabriella Gonzales (LIGO spokesperson)

LIGO Special

On Thursday at 16:00 in L6, a seminar in
the Number Theory series:

Abbes Ahmed (Institut des Hautes Etudes Scientifiques)

On Hodge-Tate local systems

*I will revisit the theory of Hodge-Tate local systems in the light of the p-adic Simpson correspondence. This is a joint work with Michel Gros.*

**Further information:**
On Thursday at 16:15 in Sciama Lecture Theatre, a seminar in
the Particles and fields series:

(special talk on gravitational waves) (TBA)

No seminar today

On Friday, October 28, at 14:00 in Dennis Sciama Lecture Theatre, a seminar in
the Theoretical Physics Colloquia series:

Matthias Troyer (Zurich)

tba

On Friday, October 28, at 15:30 in Martin Wood Lecture Theatre, Clarendon Laboratory, Parks Road, a seminar in
the Colloquia Series Seminars series:

Prof Seamus Davis (Cornell University, NY, USA)

Visualizing Quantum Matter

On Monday, October 31, at 12:00 in L3, a seminar in
the String Theory series:

Anthony Ashmore (Oxford)

TBA

On Monday, October 31, at 14:15 in L4, a seminar in
the Geometry and Analysis series:

Alex Ritter (Oxford)

The cohomological McKay correspondence via Floer theory

*Abstract: (This is joint work with Mark McLean, Stony Brook University N.Y.). The classical McKay correspondence is a 1-1 correspondence between finite subgroups G of SL(2,C) and simply laced Dynkin diagrams (the ADE classification). These diagrams determine the representation theory of G, and they also describe the intersection theory between the irreducible components of the exceptional divisor of the minimal resolution Y of the simple surface singularity C^2/G. In particular those components generate the homology of Y. In the early 1990s, Miles Reid conjectured a far-reaching generalisation to higher dimensions: given a crepant resolution Y of the singularity C^n/G, where G is a finite subgroup of SL(n,C), the claim is that the conjugacy classes of G are in 1-1 correspondence with generators of the cohomology of Y. This has led to much active research in algebraic geometry in recent years, in particular Batyrev proved the conjecture in 2000 using algebro-geometric techniques (Kontsevich's motivic integration machinery). The goal of my talk is to present work in progress, jointly with Mark McLean, which proves the conjecture using symplectic topology techniques. We construct a certain symplectic cohomology group of Y whose generators are Hamiltonian orbits in Y to which one can naturally associate a conjugacy class in G. We then show that this symplectic cohomology recovers the classical cohomology of Y. This work is part of a large-scale project which aims to study the symplectic topology of resolutions of singularities also outside of the crepant setup.*

**Further information:**
On Tuesday, November 1, at 12:00 in L5, a seminar in
the Relativity series:

Paul Fendley (Oxford)

TBA

On Tuesday, November 1, at 14:15 in BIPAC Seminar Room, a seminar in
the Cosmology series:

Viraj Sanghai (Queen Mary UL)

Relativistic cosmological modelling for non-linear structures

On Tuesday, November 1, at 15:45 in L4, a seminar in
the Algebraic and Symplectic Geometry series:

Adam Gal (Oxford)

A geometric approach to Hall algebras

*The Hall algebra can be constructed using the Waldhausen S-construction. We will give a systematic recipe for this and show how it extends naturally to give a bi-algebraic structure. As a result we obtain a more transparent proof of Green's theorem about the bi-algebra structure on the Hall algebra.*

**Further information:**
On Wednesday, November 2, at 13:15 in N3.12, a seminar in
the Strings Junior series:

Marc-Antoine Fiset

Seiberg-Witten solution - 1

On Thursday, November 3, at 13:00 in Dalitz Institute, DWB, a seminar in
the Particle Phenomenology Forum series:

N/A (N/A)

UK HEP Meeting -- No Pheno Forum

On Thursday, November 3, at 16:00 in L6, a seminar in
the Number Theory series:

Natalia Garcia-Fritz (University of Toronto)

Joint Number Theory and Logic Seminar

On Thursday, November 3, at 16:15 in Sciama Lecture Theatre, a seminar in
the Particles and fields series:

(Cosener's meeting on LHC) (various speakers)

No seminar today

On Friday, November 4, at 12:00 in C5, a seminar in
the String Theory series:

Andriy Haydys (Bielefeld University)

TBA

On Friday, November 4, at 15:30 in Martin Wood Lecture Theatre, Clarendon Laboratory, Parks Road, a seminar in
the Colloquia Series Seminars series:

Dr Cait McPhee (University of Edinburgh)

Proteins as switchable Janus ellipsoids

On Monday, November 7, at 12:00 in L3, a seminar in
the String Theory series:

Bengt Nilsson (Chalmers University of Technology)

TBA

On Monday, November 7, at 14:15 in L4, a seminar in
the Geometry and Analysis series:

Felix Schulze (UCL)

On short-time existence for mean curvature flow of surface clusters with triple edges

*We will discuss two recent short-time existence results for (1) mean curvature of surface clusters, where n-dimensional surfaces in R^{n+k}, are allowed to meet at equal angles along smooth edges, and (2) for planar networks, where curves are initially allowed to meet in multiple junctions that resolve immediately into triple junctions with equal angles. The first result, which is joint work with B. White, follows from an elliptic regularisation scheme, together with a local regularity result for flows with triple junctions, which are close to a static flow of the half-planes. The second result, which is joint work with T. Ilmanen and A.Neves, relies on a monotonicity formula for expanding solutions and a local regularity result for the network flow.*

**Further information:**
On Tuesday, November 8, at 12:00 in L4, a seminar in
the Relativity series:

Dr Christian Vergu (Kings College London)

TBA

On Tuesday, November 8, at 14:00 in DWB 501 (Seminar Room), a seminar in
the Holography series:

Frederic Br�nner (TU Vienna)

Glueball Decay in Gauge/Gravity Duality

On Tuesday, November 8, at 14:15 in BIPAC Seminar Room, a seminar in
the Cosmology series:

Shinji Mukohyama (Kyoto University)

Massive gravity and cosmology

On Tuesday, November 8, at 15:45 in L4, a seminar in
the Algebraic and Symplectic Geometry series:

Alan Thompson (Warwick)

TBA

On Wednesday, November 9, at 13:30 , a seminar in
the Strings Junior series:

Pietro Benetti Genolini

Seiberg-Witten solutions - 2

On Thursday, November 10, at 13:00 in Dalitz Institute, DWB, a seminar in
the Particle Phenomenology Forum series:

Isabel Garcia Garcia (University of Oxford)

The String Soundscape at Gravitational Wave Detectors

On Thursday, November 10, at 16:00 in L6, a seminar in
the Number Theory series:

Min Lee (University of Bristol)

TBD

On Thursday, November 10, at 16:15 in Sciama Lecture Theatre, a seminar in
the Particles and fields series:

Fabio Maltoni (Universit� Catholique de Louvain)

QCD

On Friday, November 11, at 14:00 in Dennis Sciama Lecture Theatre, a seminar in
the Theoretical Physics Colloquia series:

Ignacio Cirac (Max Planck)

tensor networks: a quantum information perspective of many-body systems

On Monday, November 14, at 12:00 in L3, a seminar in
the String Theory series:

Mathew Bullimore (Oxford)

TBA

On Monday, November 14, at 14:15 in L4, a seminar in
the Geometry and Analysis series:

Brent Pym (Oxford)

TBA

On Tuesday, November 15, at 12:00 in L4, a seminar in
the Quantum Field Theory series:

Lionel Mason

to be announced

On Tuesday, November 15, at 14:15 in BIPAC Seminar Room, a seminar in
the Cosmology series:

Thomas Sotiriou (University of Nottingham)

Scalar-tensor theories and strong gravity

On Tuesday, November 15, at 15:45 in L4, a seminar in
the Algebraic and Symplectic Geometry series:

Alastair Craw (Bath)

TBA

On Wednesday, November 16, at 13:15 in N3.12, a seminar in
the Strings Junior series:

Juan Carlos Calvo Jackson

Gromov-Witten invariants and instantons corrections

On Thursday, November 17, at 13:00 in Dalitz Institute, DWB, a seminar in
the Particle Phenomenology Forum series:

John March-Russell (University of Oxford)

Electromagnetic Memory

On Thursday, November 17, at 16:00 in L6, a seminar in
the Number Theory series:

Oleksiy Klurman (University College London)

TBD

On Thursday, November 17, at 16:15 in Sciama Lecture Theatre, a seminar in
the Particles and fields series:

Matt McCullough (CERN)

A clockwork theory

On Monday, November 21, at 12:00 in L3, a seminar in
the String Theory series:

Hans Jockers (Bonn University)

TBA

On Monday, November 21, at 14:15 in L4, a seminar in
the Geometry and Analysis series:

Mark McLean (Stony Brook)

Minimal Log Discrepancy of Isolated Singularities and Reeb Orbits

*Let A be an affine variety inside a complex N dimensional vector space which either has an isolated singularity at the origin or is smooth at the origin. The intersection of A with a very small sphere turns out to be a contact manifold called the link of A. Any contact manifold contactomorphic to the link of A is said to be Milnor fillable by A. If the first Chern class of our link is 0 then we can assign an invariant of our singularity called the minimal discrepancy. We relate the minimal discrepancy with indices of certain Reeb orbits on our link. As a result we show that the standard contact 5 dimensional sphere has a unique Milnor filling up to normalization. This generalizes a Theorem by Mumford.*

**Further information:**
On Tuesday, November 22, at 12:00 in L4, a seminar in
the Relativity series:

Federico Zerbini (Bonn)

TBA

On Tuesday, November 22, at 15:45 in L4, a seminar in
the Algebraic and Symplectic Geometry series:

Mark McLean (Stony Brook)

TBA

On Wednesday, November 23, at 13:15 in N3.12, a seminar in
the Strings Junior series:

Omar Kidwai

Hitchin systems

On Thursday, November 24, at 14:15 in Sciama Lecture Theatre, a seminar in
the Particles and fields series:

various speakers (Note unusual time)

MikeFest: gauge theory on the lattice

On Friday, November 25, at 14:00 in Dennis Sciama Lecture Theatre, a seminar in
the Theoretical Physics Colloquia series:

Steve Balbus (Oxford)

A simple approach to gravitational radiation and its back reaction

On Monday, November 28, at 12:00 in L3, a seminar in
the String Theory series:

Mario Martone (Cornell)

TBA

On Monday, November 28, at 14:15 in L4, a seminar in
the Geometry and Analysis series:

Ruxandra Moraru (Waterloo)

TBA

On Tuesday, November 29, at 12:00 in L4, a seminar in
the Relativity series:

Glen Barnich (ULB Brussells)

Finite BMS transformations

*After a brief review of holographic features of general relativity in 3 and 4 dimensions, I will show how to derive the transformation laws of the Bondi mass and angular momentum aspects under finite supertranslations, superrotations and complex Weyl rescalings.*

**Further information:**
On Tuesday, November 29, at 15:45 in L4, a seminar in
the Algebraic and Symplectic Geometry series:

Kim Moore (Cambridge)

TBA

On Wednesday, November 30, at 13:15 in N3.12, a seminar in
the Strings Junior series:

Wenzhe Yang

Geometric Langlands conjecture

On Thursday, December 1, at 13:00 in Dalitz Institute, DWB, a seminar in
the Particle Phenomenology Forum series:

PT probationary students (University of Oxford)

Graduate student presentations

On Thursday, December 1, at 16:15 in Sciama Lecture Theatre, a seminar in
the Particles and fields series:

Fernando Marchesano (Instituto de F�sica Te�rica, Madrid)

F-theory

On Friday, December 2, at 16:00 in L1, a seminar in
the Math Colloquium series:

Steve Simon ((Oxford University))

Topologically Ordered Matter and Why You Should be Interested

*In two dimensional topological phases of matter, processes depend on gross topology rather than detailed geometry. Thinking in 2+1 dimensions, the space-time histories of particles can be interpreted as knots or links, and the amplitude for certain processes becomes a topological invariant of that link. While sounding rather exotic, we believe that such phases of matter not only exist, but have actually been observed (or could be soon observed) in experiments. These phases of matter could provide a uniquely practical route to building a quantum computer. Experimental systems of relevance include Fractional Quantum Hall Effects, Exotic superconductors such as Strontium Ruthenate, Superfluid Helium, Semiconductor-Superconductor-Spin-Orbit systems including Quantum Wires. The physics of these systems, and how they might be used for quantum computation will be discussed.*

**Further information:**
On Tuesday, January 17, at 12:00 in L4, a seminar in
the Relativity series:

Lance Dixon (Stanford)

TBA

On Tuesday, February 7, at 12:00 in L4, a seminar in
the Relativity series:

Dr Michal Wrochna (Grenoble)

TBA

On Friday, February 10, at 16:00 in L1, a seminar in
the Math Colloquium series:

Eitan Tadmor (University of Maryland)

tba

*tba*

**Further information:**
On Friday, March 3, at 16:00 in L1, a seminar in
the Math Colloquium series:

Ana Caraiani (University of Bonn)

tba

On Friday, April 28, at 16:00 in L1, a seminar in
the Math Colloquium series:

Catharina Stroppel (University of Bonn)

tba

On Friday, June 9, at 16:00 in L1, a seminar in
the Math Colloquium series:

Caroline Series (University of Warwick)

tba