# All Upcoming Events

On Friday, May 6, at 11:00 in C2, a seminar in
the Arithmetic Geometry series:

Damian Rössler ((Oxford University))

The cotangent complex I

**Further information:**This is the first talk of the workshop organised by F. Brown, M. Kim and D. Rössler on Beilinson's approach to p-adic Hodge theory. In this talk, we shall give the definition and recall various properties of the cotangent complex, which was originally defined by L. Illusie in his monograph 'Complexe cotangent et déformations' (Springer LNM 239, 1971).

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

Daniel Prins (CEA/Saclay)

Mirror symmetry, supersymmetry and generalized geometry on SU(4)-structure vacua

**Further information:**>Recently, there has been some progress in examining mirror symmetry beyond >Calabi-Yau threefolds. I will discuss how this is related to flux vacua of >type II supergravity on eight-dimensional manifolds equipped with >SU(4)-structure. It will be shown that the natural framework to describe >such vacua is generalized complex geometry. Two classes of type IIB >solutions will be given, one of which is complex, the other symplectic, and >I will describe in what sense these are mirror to one another.

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

Susan Sierra (Edinburgh)

Contracting (-1) curves on noncommutative surfaces

**Further information:**We give a noncommutative analogue of Castelnuovo's classic theorem that (-1) lines on a smooth surface can be contracted, and show how this may be used to construct an explicit birational map between a noncommutative P^2 and a noncommutative quadric surface. This has applications to the classification of noncommutative projective surfaces, one of the major open problems in noncommutative algebraic geometry. We will not assume a background in noncommutative ring theory. The talk is based on joint work with Rogalski and Staffor

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

Dr Hadi Godazgar (Cambridge DAMTP)

Quantum corrections to Hawking radiation

**Further information:**Black holes are one of the few available laboratories for testing theoretical ideas in fundamental physics. Since Hawking's result that they radiate a thermal spectrum, black holes have been regarded as thermodynamic objects with associated temperature, entropy, etc. While this is an extremely beautiful picture it has also lead to numerous puzzles. In this talk I will describe the two-loop correction to scalar correlation functions due to \phi^4 interactions and explain why this might have implications for our current view of semi-classical black holes.

On Tuesday at 15:30 in L4, a seminar in
the Algebraic and Symplectic Geometry series:

Ben Davison (EPFL)

Cohomological DT theory beyond the integrality conjecture

**Further information:**The integrality conjecture is one of the central conjectures of the DT theory of quivers with potential, which itself is a key tool in understanding the local calculation of DT invariants on moduli spaces of coherent sheaves, as well as having deep links to geometric representation theory, noncommutative geometry and algebraic combinatorics. I will explain some of the ingredients of the proof of this conjecture by myself and Sven Meinhardt. In fact the proof gives much more than the original conjecture, which ultimately concerns identities in a Grothendieck ring of mixed Hodge structures associated to moduli spaces of representations, and proves that these equalities categorify to isomorphisms in the category of mixed Hodge structures. I'll explain what this all means, as well as giving some applications of the categorified version of the theory.

On Wednesday at 12:00 in L4, a seminar in
the Strings Junior series:

Andrea Ferrari

2D non-linear Sigma Models

On Wednesday at 14:00 in C4, a seminar in
the Twistor Workshop series:

Dr Eduardo Casali (Oxford)

The pure spinor string and twistors in 10 dimensions after Berkovits

On Thursday at 11:30 in BIPAC seminar room, DWB, a seminar in
the Cosmology series:

Florian Kuhnel (Stockholm)

Primordial Black Holes, Critical Collapse, and Corpuscular Physics

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

Jessica Turner (IPPP Durham)

TBD

**Further information:**http:/

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

Norbert A’Campo (University of Basel)

(Joint with logic) Two models for the hyperbolic plane and existence of the Poincaré metric on compact Riemann surfaces

**Further information:**An implicite definition for the hyperbolic plane $H=H_I$ is in: ${\rm Spec}(\mathbb{R}[X]) = H_I \cup \mathbb{R}$. All geometric hyperbolic features will follow from this definition in an elementary way. A second definition is $H=H_J=\{J \in {\rm End}(R^2) \mid J^2=-Id, dx \wedge dy(u,Ju) \geq 0 \}$. Working with $H=H_J$ allows to prove rather directly main theorems about Riemann surfaces.

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

Enrico Pajer (ITP Utrecht)

On the origin of adiabatic perturbations

**Further information:**https:/

On Friday, May 13, at 14:00 in Dennis Sciama Lecture Theatre, a seminar in
the Theoretical Physics Colloquia series:

Christophe Pichon (Paris)

tba

On Monday, May 16, at 14:15 in L4, a seminar in
the Geometry and Analysis series:

Luc Nguyen (Oxford)

Quantitative Liouville theorems for equations of the Schouten tensor in conformal geometry.

**Further information:**The classical Yamabe problem asks to find in a given conformal class a metric of constant scalar curvature. In fully nonlinear analogues, the scalar curvature is replaced by certain functions of the eigenvalue of the Schouten curvature tensor. I will report on quantitative Liouville theorems and fine blow-up analysis for these problems. Joint work with Yanyan Li.

On Wednesday, May 18, at 12:00 in L4, a seminar in
the Strings Junior series:

Marc-Antoine Fiset

Matrix Models

On Thursday, May 19, at 13:00 in Dalitz Institute, DWB, a seminar in
the Particle Phenomenology Forum series:

Nabarun Chakrabarty (Harish-Chandra Research Institute)

High-scale validity of two and three higgs doublet scenarios

**Further information:**http:/

On Thursday, May 19, at 14:15 in BIPAC seminar room, DWB, a seminar in
the Cosmology series:

Clotilde Laigle (Paris)

New insights on galaxy evolution at high redshift from the joint analysis of observed and simulated lightcones

On Thursday, May 19, at 16:00 in L6, a seminar in
the Number Theory series:

Roger Baker (Brigham Young University)

On the distribution modulo one of $\alpha p^k$

**Further information:**For $k \geq 3$ we give new values of $\rho_k$ such that $$ \| \alpha p^k + \beta \| < p^{-\rho_k} $$ has infinitely many solutions in primes whenever $\alpha$ is irrational and $\beta$ is real. The mean value results of Bourgain, Demeter, and Guth are useful for $k \geq 6$; for all $k$, the results also depend on bounding the number of solutions of a congruence of the form $$ \left\| \frac{sy^k}{q} \right\| < \frac{1}{Z} \ \ (1 \leq y \leq Y < q) $$ where $q$ is a given large natural number.

On Thursday, May 19, at 16:15 in Sciama Lecture Theatre, a seminar in
the Particles and fields series:

Diederik Roest (University of Groningen)

Galileons as the scalar analogue of general relativity

**Further information:**http:/

On Monday, May 23, at 14:15 in L4, a seminar in
the Geometry and Analysis series:

Vasilisa Shramchenko (Universite de Sherbrooke)

Poncelet's theorem and Painleve VI

**Further information:**In 1995 N. Hitchin constructed explicit algebraic solutions to the Painlevé VI (1/8,-1/8,1/8,3/8) equation starting with any Poncelet trajectory, that is a closed billiard trajectory inscribed in a conic and circumscribed about another conic. In this talk I will show that Hitchin's construction is the Okamoto transformation between Picard's solution and the general solution of the Painlevé VI (1/8,-1/8,1/8,3/8) equation. Moreover, this Okamoto transformation can be written in terms of an Abelian differential of the third kind on the associated elliptic curve, which allows to write down solutions to the corresponding Schlesinger system in terms of this differential as well. This is a joint work with V. Dragovic.

On Tuesday, May 24, at 12:00 in L4, a seminar in
the Quantum Field Theory series:

Keith Hannabuss

T-duality and the condensed matter bulk-boundary correspondence

On Wednesday, May 25, at 12:00 in L4, a seminar in
the Strings Junior series:

Stefan Nekovar

Loop Operators

On Thursday, May 26, at 13:00 in Dalitz Institute, DWB, a seminar in
the Particle Phenomenology Forum series:

Robert Lasenby (Perimeter Institute)

Searching for ultra-light bosons with black holes

**Further information:**http:/

On Thursday, May 26, at 14:15 in BIPAC seminar room, DWB, a seminar in
the Cosmology series:

David Wands (Portsmouth)

A relativistic approach to large-scale structure

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

Trevor Wooley (University of Bristol)

TBD

On Thursday, May 26, at 16:15 in Sciama Lecture Theatre, a seminar in
the Particles and fields series:

Alexander Lenz (IPPP Durham)

Flavour physics 2016: Quo vadis?

**Further information:**https:/

On Friday, May 27, at 14:00 in Dennis Sciama Lecture Theatre, a seminar in
the Theoretical Physics Colloquia series:

Massimo Porrati (New York)

tba

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

Ugo Bruzzo (SISSA)

tba

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

Greg Berczi (Oxford)

Non-reductive GIT for graded groups and curve counting

**Further information:**I will start with a short report on recent progress in constructing quotients by actions of non-reductive algebraic groups and extending Mumford's geometric invariant theory to a wide class of non-reductive linear algebraic groups which we call graded groups. I will then explain how certain components of the Hilbert scheme of points on smooth varieties can be described as non-reductive quotients and why this description is especially efficient to study the topology of Hilbert schemes. In particular I will explain how equivariant localisation can be used to develop iterated residue formulae for tautological integrals on geometric subsets of Hilbert schemes and I present new formulae counting curves on surfaces (and more generally hypersurfaces in smooth varieties) with given singularity classes. This talk is based on joint works with Frances Kirwan, Thomas Hawes, Brent Doran and Andras Szenes.

On Wednesday, June 1, at 12:00 in L4, a seminar in
the Strings Junior series:

Dr Andreas Braun

Topological String Theory

On Thursday, June 2, at 13:00 in Dalitz Institute, DWB, a seminar in
the Particle Phenomenology Forum series:

Frederic Dreyer (LPTHE/CERN)

TBC

**Further information:**http:/

On Thursday, June 2, at 14:15 in BIPAC seminar room, DWB, a seminar in
the Cosmology series:

Patricia Larsen (Cambridge)

Topics in weak lensing

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

Rachel Newton (Institut des Hautes Etudes Scientifiques)

TBD

On Thursday, June 2, at 16:15 in Sciama Lecture Theatre, a seminar in
the Particles and fields series:

Frank Close (Oxford)

Half Life: the divided life of Bruno Maximovich Pontecorvo

**Further information:**https:/

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

Bernd Sturmfels (UC Berkeley)

tba

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

Thomas Schick (Gottingen)

Obstructions to positive scalar curvature via submanifolds of different codimension

**Further information:**Question: Given a smooth compact manifold $M$ without boundary, does $M$ admit a Riemannian metric of positive scalar curvature? We focus on the case of spin manifolds. The spin structure, together with a chosen Riemannian metric, allows to construct a specific geometric differential operator, called Dirac operator. If the metric has positive scalar curvature, then 0 is not in the spectrum of this operator; this in turn implies that a topological invariant, the index, vanishes. We use a refined version, acting on sections of a bundle of modules over a $C^*$-algebra; and then the index takes values in the K-theory of this algebra. This index is the image under the Baum-Connes assembly map of a topological object, the K-theoretic fundamental class. The talk will present results of the following type: If $M$ has a submanifold $N$ of codimension $k$ whose Dirac operator has non-trivial index, what conditions imply that $M$ does not admit a metric of positive scalar curvature? How is this related to the Baum-Connes assembly map? We will present previous results of Zeidler ($k=1$), Hanke-Pape-S. ($k=2$), Engel and new generalizations. Moreover, we will show how these results fit in the context of the Baum-Connes assembly maps for the manifold and the submanifold.

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

Dr Nima Doroud (Cambridge DAMTP)

Superconformal Anyons

On Tuesday, June 7, at 14:00 in DWB 501 Fisher Room, a seminar in
the Holography series:

Ehsan Hatefi (Queen Mary)

Black Hole Formation and Critical Collapse in the Axion- Dilaton System in Diverse Dimensions

On Wednesday, June 8, at 12:00 in L4, a seminar in
the Strings Junior series:

Wenzhe Yang

Topological Quantum Field Theory

On Thursday, June 9, at 13:00 in Dalitz Institute, DWB, a seminar in
the Particle Phenomenology Forum series:

Marco Nardecchia (Cambridge)

TBD

**Further information:**http:/

On Thursday, June 9, at 14:15 in BIPAC seminar room, DWB, a seminar in
the Cosmology series:

Anze Slozar (Brookhaven)

Here Be Dragons: exploring the redshift 2 to 6 universe

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

Joni Teräväinen (University of Turku)

TBD

On Thursday, June 9, at 16:15 in Sciama Lecture Theatre, a seminar in
the Particles and fields series:

Guilherme Milhano (IST Lisbon)

Sense and sensitivity: from in-medium parton dynamics to QGP and jets

**Further information:**http:/

On Friday, June 10, at 14:00 in Dennis Sciama Lecture Theatre, a seminar in
the Theoretical Physics Colloquia series:

M J Perry (Cambridge)

tba

On Monday, June 13, at 14:15 in L3, a seminar in
the Geometry and Analysis series:

Wolfgang Ziller (University of Pennsylvania)

tba

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

Klaas Landsman (Radboud Universiteit Nijmegen)

Spontaneous Symmetry Breaking in lattice spin systems

On Tuesday, June 14, at 15:45 in L4, a seminar in
the Algebraic and Symplectic Geometry series:

Alexandru Oancea (Jussieu)

TBA

On Wednesday, June 15, at 12:00 in L4, a seminar in
the Strings Junior series:

Pietro Benetti Genolini

RG flows and functions along RG trajectories

On Thursday, June 16, at 13:00 in Dalitz Institute, DWB, a seminar in
the Particle Phenomenology Forum series:

Simon Kast (KIT)

Top-Flavoured Dark Matter in Dark Minimal Flavour Violation

**Further information:**http:/

On Thursday, June 16, at 14:15 in BIPAC seminar room, DWB, a seminar in
the Cosmology series:

Daan Meerburg (CITA)

The holiest grail

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

Roger Heath-Brown (Oxford University)

TBD

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

Jernej Kamenik (Jozef Stefan Institute, Ljubljana)

Theory perspective on the LHC di-photon excess

**Further information:**https:/

On Friday, June 17, at 16:00 in L1, a seminar in
the Math Colloquium series:

David Vogan (MIT)

tbc

On Monday, June 20, at 01:00 , a seminar in
the Math Colloquium series:

Jacob Lurie (Hardy Lecture Tour) Time/venue tbc (Harvard University)

'Formal Moduli Problems'

**Further information:**Abstract tba

On Thursday, July 14, at 13:00 in Dalitz Institute, DWB, a seminar in
the Particle Phenomenology Forum series:

Carsten Rott (Sungkyunkwan University)

TBD