Next Week

Here is a selection of seminars that might be of interest to string theorists in Oxford:

On Monday at 12:45 in L3, a seminar in the String Theory series:
Michael Green (Cambridge and QMUL)
Modular properties of supersttring scattering amplitudes,
Further information: The coefficients of the low energy expansion of closed string amplitudes transform as automorphic functions under En(Z) U-duality groups.  The seminar will give an overview of some features of the coefficients of low order terms in this expansion, which involve a fascinating interplay between multiple zeta values and certain elliptic and hyperelliptic generalisations, Langlands Eisenstein series for the En groups, and the ultraviolet behaviour of maximally supersymmetric supergravity.   
On Monday at 14:00 in Dennis Sciama Lecture Theatre, a seminar in the Astrophysics Colloquia series:
NO Colloquium: Bank Holiday
On Monday at 14:15 in L4, a seminar in the Geometry and Analysis series:
Marco Gualtieri (Toronto)
The generalized Kahler potential
Further information: I will explain our recent description of the fundamental degrees of freedom underlying a generalized Kahler structure. For a usual Kahler structure, it is well-known that the geometry is determined by a complex structure, a Kahler class, and the choice of a positive(1,1)-form in this class, which depends locally on only a single real-valued function: the Kahler potential. Such a description for generalized Kahler geometry has been sought since it was discovered in1984. We show that a generalized Kahler structure of symplectic type is determined by a pair of holomorphic Poisson manifolds, a holomorphic symplectic Morita equivalence between them, and the choice of a positive Lagrangian brane bisection, which depends locally on only a single real-valued function, which we call the generalized Kahler potential. To solve the problem we make use of, and generalize, two main tools: the first is the notion of symplectic Morita equivalence, developed by Weinstein and Xu to study Poisson manifolds; the second is Donaldson's interpretation of a Kahler metric as a real Lagrangian submanifold in a deformation of the holomorphic cotangent bundle.  
On Monday at 16:15 in Beecroft Seminar Room, a seminar in the Theoretical Particle Physics series:
Fabrizio Caola (IPPP, Durham)
Precision as a path to discovery
On Tuesday, May 29, at 15:45 in L4, a seminar in the Algebraic Geometry series:
Milena Hering (Edinburgh)
Frobenius splittings of toric varieties
Further information: Varieties admitting Frobenius splittings exhibit very nice properties. For example, many nice properties of toric varieties can be deduced from the fact that they are Frobenius split. Varieties admitting a diagonal splitting exhibit even nicer properties. In this talk I will give an overview over the consequences of the existence of such splittings and then discuss criteria for toric varieties to be diagonally split.
On Thursday, May 31, at 12:45 in L6, a seminar in the Strings Junior series:
Matteo Parisi
Landau-Ginzburg models
On Thursday, May 31, at 13:00 in Dalitz Institute (Denys Wilkinson Building), a seminar in the Dalitz Seminar in Fundamental Physics series:
Rudin Petrossian-Byrne & Hannah Tillim (Oxford)
On Thursday, May 31, at 16:00 in L6, a seminar in the Number Theory series:
François Charles (Universite Paris-Sud)
Coherent sheaves on arithmetic schemes and basic results on arithmetic ampleness
Further information: We will discuss a basic framework to deal with coherent sheaves on schemes over $\mathbb{Z}$, involving infinite-dimensional results on the geometry of numbers. As an application, we will discuss basic results, old and new, on arithmetic ampleness, such as Serre vanishing, Nakai-Moishezon, and Bertini. This is joint work with Jean-Benoît Bost.
On Thursday, May 31, at 16:15 in Beecroft Seminar Room, a seminar in the Theoretical Particle Physics series:
Beyond the Standard Model: theories & signatures in an experimental era