# All Upcoming Events

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

Lance Dixon (Stanford)

Polylogarithmic Polygon Origami

*Amplitudes in planar N=4 SYM are dual to light-like polygonal Wilson-loop expectation values. In many cases their perturbative expansion can be expressed in terms of multiple polylogarithms which also obey certain single-valuedness conditions or branch cut restrictions. The rigidity of this function space, together with a few other conditions, allows one to construct the six-point amplitude -- or hexagonal Wilson loop -- through at least five loops, and the seven-point amplitude through 3.5 loops. Then one can 'fold' the polygonal Wilson loops into multiple degenerate configurations, expressing the limiting behavior in terms of simpler function spaces, and learning in the process about how amplitudes factorize.*

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

Roman Konoplya (U. Tubingen)

tba

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

Andrew MacPherson (London)

The universal property of derived geometry

*I'll show how a simple universal property attaches a category of derived manifolds to any category with finite products and some suitable notion of 'topology'. Starting with the category of real Euclidean spaces and infinitely differentiable maps yields the category of derived smooth manifolds studied by D. Spivak and others, while starting with affine spaces over some ring and polynomial maps produces a flavour of the derived algebraic geometry of Lurie and Toen-Vezzosi. I'll motivate this from the differentiable setting by showing that the universal property easily implies all of D. Spivak's axioms for being 'good for intersection theory on manifolds'.*

**Further information:**
On Thursday at 13:00 in Dalitz Institute, a seminar in
the Dalitz Seminar in Fundamental Physics series:

Jesse Liu (University of Oxford)

Soft physics and interpretation challenges for LHC supersymmetry searches

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**Further information:**
On Thursday at 16:15 in Sciama Lecture Theatre, a seminar in
the Theoretical Particle Physics series:

Lance Dixon (Stanford)

N=4 supersymmetric Yang-Mills amplitudes

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

Mark Dennis (Bristol)

Getting tangled in structured light: knotted linear wave fields

On Monday at 12:45 in L3, a seminar in
the String Theory series:

Fernando Alday (Oxford)

Large Spin Pertubation Theory

*A conformal field theory is characterised by the CFT data, namely the spectrum of scaling dimensions and OPE coefficients. The idea of the conformal bootstrap is to use associativity of the operator algebra together with the symmetries of the theory to constraint the CFT data. For the sector of operators with large spin one can actually use these ideas to obtain analytical results. It was recently understood how to set up a systematic expansion around this sector, leading to analytic results to all orders in inverse powers of the spin. We will show how to use this large spin perturbation theory to obtain analytic results for vast families of CFTs. Some of the applications include vector models, weakly coupled gauge theories and the computation of loops for scalar theories in AdS.*

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

Frances Kirwan (Oxford)

Moduli spaces of unstable curves

*The construction of the moduli spaces of stable curves of fixed genus is one of the classical applications of Mumford's geometric invariant theory (GIT). Here a projective curve is stable if it has only nodes as singularities and its automorphism group is finite. Methods from non-reductive GIT allow us to classify the singularities of unstable curves in such a way that we can construct moduli spaces of unstable curves of fixed singularity type.*

**Further information:**
On Tuesday, January 24, at 12:00 in L4, a seminar in
the Relativity series:

Dr Tomek Lukowski (Oxford)

TBA

On Tuesday, January 24, at 15:45 in L4, a seminar in
the Algebraic and Symplectic Geometry series:

Joshua Jackson (Oxford)

Variation of non-reductive geometric invariant theory

On Tuesday, January 24, at 15:45 in L4, a seminar in
the Algebraic and Symplectic Geometry series:

Joshua Jackson (Oxford)

TBA

On Thursday, January 26, at 16:00 in L6, a seminar in
the Number Theory series:

Otmar Venjakob (Heidelberg)

TBA

On Thursday, January 26, at 16:15 in Sciama Lecture Theatre, a seminar in
the Theoretical Particle Physics series:

Fabio Maltoni (Universite Catholique de Louvain)

Measuring the Higgs self-coupling

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**Further information:**
On Friday, January 27, at 15:30 in Martin Wood Lecture Theatre, Clarendon Laboratory, Parks Road, Oxford, a seminar in
the Colloquia Series Seminars series:

Prof Nicola Spaldin (ETH, Zurich)

From Materials to Cosmology: Studying the early universe under the microscope

On Friday, January 27, at 16:00 in L1, a seminar in
the Math Colloquium series:

Paul Klemperer (University of Oxford)

Mathematics and Auction Design

*Mathematical methods are increasingly being used to design auctions. Paul Klemperer will talk about some of his own experience which includes designing the U.K.'s mobile phone licence auction that raised £22.5 billion, and a new auction that helped the Bank of England in the financial crisis. (The then-Governor, Mervyn King, described it as 'a marvellous application of theoretical economics to a practical problem of vital importance'.) He will also discuss further development of the latter auction using convex and 'tropical' geometric methods.*

**Further information:**
On Monday, January 30, at 12:45 in L3, a seminar in
the String Theory series:

Henrik Gustafsson (Goteborg)

TBA

On Monday, January 30, at 14:15 in L4, a seminar in
the Geometry and Analysis series:

Yang-hui He (City University London)

Quivers, Dessins and Calabi-Yau

*We discuss how bipartite graphs on Riemann surfaces encapture a wealth of information about the physics and the mathematics of gauge theories. The correspondence between the gauge theory, the underlying algebraic geometry of its space of vacua, the combinatorics of dimers and toric varieties, as well as the number theory of dessin d'enfants becomes particularly intricate under this light.*

**Further information:**
On Tuesday, January 31, at 14:00 in DWB 501 (Seminar Room), a seminar in
the Holography series:

Carlos Hoyos (U. Oviedo)

tba

On Tuesday, January 31, at 15:45 in L4, a seminar in
the Algebraic and Symplectic Geometry series:

Joe Karmazyn (Sheffield)

TBA

On Thursday, February 2, at 16:00 in L6, a seminar in
the Number Theory series:

Tyler Kelly (Cambridge)

TBA

On Thursday, February 2, at 16:15 in Sciama Lecture Theatre, a seminar in
the Theoretical Particle Physics series:

David Marsh (DAMTP Cambridge)

Many-field inflation

On Friday, February 3, at 14:00 in Dennis Sciama Lecture Theatre, a seminar in
the Theoretical Physics Colloquia series:

John Magorrian (Oxford)

The virial theorem revisited

On Friday, February 3, at 15:30 in Martin Wood Lecture Theatre, Clarendon Laboratory, Parks Road, Oxford, a seminar in
the Colloquia Series Seminars series:

Professor Val Gibson (Cambridge)

The Beauty of Flavour - Latest results from the LHCb experiment at the Large Hadron Collider

On Monday, February 6, at 12:45 in L3, a seminar in
the String Theory series:

Jan de Boer (Amsterdam)

TBA

On Monday, February 6, at 14:15 in L4, a seminar in
the Geometry and Analysis series:

Michael Singer (University College London)

Monopoles and the Sen Conjecture

*The Sen conjecture, made in 1994, makes precise predictions about the existence of L^2 harmonic forms on the monopole moduli spaces. For each positive integer k, the moduli space M_k of monopoles of charge k is a non-compact smooth manifold of dimension 4k, carrying a natural hyperkaehler metric. Thus studying Sen’s conjectures requires a good understanding of the asymptotic structure of M_k and its metric. This is a challenging analytical problem, because of the non-compactness of M_k and because its asymptotic structure is at least as complicated as the partitions of k. For k=2, the metric was written down explicitly by Atiyah and Hitchin, and partial results are known in other cases. In this talk, I shall introduce the main characters in this story and describe recent work aimed at proving Sen’s conjecture.*

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

Dr Michal Wrochna (Grenoble)

TBA

On Thursday, February 9, at 16:00 in L6, a seminar in
the Number Theory series:

Johannes Nicaise (Imperial College London)

TBA

On Thursday, February 9, at 16:15 in Sciama Lecture Theatre, a seminar in
the Theoretical Particle Physics series:

Jure Zupan (CERN/Cincinnati)

Searching for dark sectors

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 Monday, February 13, at 12:45 in L3, a seminar in
the String Theory series:

Adriana Salerno (Bates College Maine)

TBA

On Monday, February 13, at 14:15 in L4, a seminar in
the Geometry and Analysis series:

Matt Bullimore (Oxford)

TBA

On Tuesday, February 14, at 12:00 in L4, a seminar in
the Quantum Field Theory series:

Ron A Reid Edwards (Hull)

to be announced

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

Francesco Nitti (U. Paris Diderot)

tba

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

Christopher Deninger (Münster)

TBA

On Thursday, February 16, at 16:15 in Sciama Lecture Theatre, a seminar in
the Theoretical Particle Physics series:

TBD (TBD)

TBD

On Friday, February 17, at 14:00 in Dennis Sciama Lecture Theatre, a seminar in
the Theoretical Physics Colloquia series:

Gavin Salam (CERN)

tba

On Friday, February 17, at 15:30 in Martin Wood Lecture Theatre, Clarendon Laboratory, Parks Road, Oxford, a seminar in
the Colloquia Series Seminars series:

Prof Valerio Scarani (Centre for Quantum Technologies and National University of Singapore)

The applied side of Bell nonlocality

On Monday, February 20, at 14:15 in L4, a seminar in
the Geometry and Analysis series:

Joel Fine (Universite Libre de Bruxelles)

TBA

On Tuesday, February 21, at 12:00 in L4, a seminar in
the Quantum Field Theory series:

Emery Sokatchev

to be announced

On Tuesday, February 21, at 15:45 in L4, a seminar in
the Algebraic and Symplectic Geometry series:

Vicky Hoskins (Freie Universität Berlin)

TBA

On Thursday, February 23, at 16:15 in Sciama Lecture Theatre, a seminar in
the Theoretical Particle Physics series:

Petr Horava (Berkeley)

More surprises with nonrelativistic naturalness

On Friday, February 24, at 15:30 in Martin Wood Lecture Theatre, Clarendon Laboratory, Parks Road, Oxford, a seminar in
the Colloquia Series Seminars series:

Prof Tom McLeish (Durham University)

Learning new physics from a medieval thinker � Big Bangs and Rainbows

On Monday, February 27, at 12:45 in L3, a seminar in
the String Theory series:

Leron Borsten (Dublin IAS)

TBA

On Monday, February 27, at 14:15 in L4, a seminar in
the Geometry and Analysis series:

Yng-Ing Lee (National Taiwan University (visiting Oxford))

TBA

On Tuesday, February 28, at 12:00 in L4, a seminar in
the Relativity series:

David Broadhurst (Open University)

TBA

On Tuesday, February 28, at 14:00 in DWB 501 (Seminar Room), a seminar in
the Holography series:

Wilke van der Schee (MIT)

tba

On Tuesday, February 28, at 15:45 , a seminar in
the Algebraic and Symplectic Geometry series:

Elisa Postinghel (Loughborough University)

TBA

On Thursday, March 2, at 16:15 in L6, a seminar in
the Number Theory series:

Payman Kassaei (Kings College London)

TBA

On Thursday, March 2, at 16:15 in Sciama Lecture Theatre, a seminar in
the Theoretical Particle Physics series:

Mads Frandsen (CP3-Origins, Odense)

Dynamical electroweak symmetry breaking in light of LHC results

On Friday, March 3, at 14:00 in Dennis Sciama Lecture Theatre, a seminar in
the Theoretical Physics Colloquia series:

Herbert Spohn (MA@TUM)

tba

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

Ana Caraiani (University of Bonn)

tba

On Monday, March 6, at 14:15 in L4, a seminar in
the Geometry and Analysis series:

Marcos Jardim (Campinas (visiting Edinburgh))

Moduli spaces of instanton sheaves on projective space

On Tuesday, March 7, at 12:00 in L4, a seminar in
the Quantum Field Theory series:

Graeme Segal

to be announced

On Tuesday, March 7, at 15:45 in L4, a seminar in
the Algebraic and Symplectic Geometry series:

Vidit Nanda (Oxford)

Local cohomology and canonical stratification

On Thursday, March 9, at 16:00 in L6, a seminar in
the Number Theory series:

Jean-Benoît Bost (Université Paris-Sud, Orsay)

TBA

On Thursday, March 9, at 16:15 in Sciama Lecture Theatre, a seminar in
the Theoretical Particle Physics series:

Gennaro Corcella (INFN Frascati)

Interpretation of top-quark mass measurements

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**Further information:**
On Tuesday, March 14, at 12:00 in L4, a seminar in
the Quantum Field Theory series:

Guo Chuan Thiang (Adelaide)

Differential topology of exotic fermions in semimetals

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

Erwin Frey (LMU)

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, May 12, at 16:00 in L1, a seminar in
the Math Colloquium series:

Hinke M Osinga (University of Auckland, NZ)

tba

*tba*

**Further information:**
On Tuesday, May 23, at 12:00 in L4, a seminar in
the Quantum Field Theory series:

Arthur Lipstein (Durham University)

to be announced

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

Caroline Series (University of Warwick)

tba