We are located at the 6th floor of the G.O. Jones Building on the Mile End Campus, midway between Stepney Green and Mile End Tube stations, approximately 1520 minutes from central London on the Central or District lines. If exiting Stepney Green tube station, turn left and walk along the Mile End Road for approximately 300 metres. The G.O. Jones (Physics) building is to the right of the main college building, which is fronted by a clocktower and lawn. If exiting Mile End tube station, turn left and walk approximately 300 metres until you are opposite the main college building. A more detailed description can be found here.
Found at least 20 result(s)
Regular Seminar Andrew Tolley (Imperial College London)
at: 14:00 room G O Jones 610  abstract: I will review how the requirements of unitarity, locality, causality and Lorentz invariance impose constraints on the signs of the operator coefficients in an effective field theory, discuss recent work on generalizing these constraints to arbitrary spin particles, and discuss how these can be used to constrain gravitational EFTs of the type considered by cosmologists as models for dark energy or inflation. 
Regular Seminar Yolanda Lozano (Oviedo U.)
at: 14:00 room G O Jones 610  abstract: NonAbelian Tduality, a transformation in String Theory known since the 90’s, has been shown recently to be a powerful solution generating technique in supergravity. In this talk I will discuss various AdS backgrounds generated through this transformation, for which it is possible to give a dual CFT interpretation arising from HananyWitten brane setups. 
Regular Seminar Claude Duhr (Cern)
at: 14:00 room G O Jones 610  abstract: The computation of Feynman integrals is an important ingredient to compute scattering amplitudes to higher orders in perturbative QFT. Over the last couple of years, a lot of progress was made in understanding the mathematics of multiloop Feynman integrals. In particular, it was understood that large classes of integrals evaluate to a class of special functions called multiple polylogarithms, which are an object of active research also in pure mathematics. It is known that starting from two loop, generalisations of polylogarithms to elliptic curves can show up. In this talk we review certain classes of elliptic multiple polylogarithms, and we show that they are closely related to iterated integrals on certain modular curves. 
Regular Seminar Georgios Papathanasiou (DESY)
at: 14:00 room G O Jones 610  abstract: I present recent progress towards determining the planar Smatrix of maximally supersymmetric YangMills theory, thanks to the rich interplay between its perturbative analytic properties in general kinematics, and its integrable structure in special kinematics. The former are related to cluster algebras, and allow for the computation of amplitudes with six/seven gluons up to six/four loops, whereas the latter yields all amplitudes in the multiRegge limit at finite coupling. 
Regular Seminar Ruth Shir (Hebrew University of Jerusalem)
at: 16:00 room G O Jones 610  abstract: Feynman diagrams will be looked at from a new point of view. 'Symmetries of Feynman Integrals' is an analytical method for calculating Feynman diagrams. It is based on exposing an underlying group structure of a given diagram which defines a set of partial differential equations in the parameter space of the diagram. Group orbits in the diagram’s parameter space are used to reduce the Feynman integral into a line integral. The vacuum seagull, a threeloop diagram, and the propagator seagull, a propagatortype diagram with two loops, will be used to demonstrate the method, and to obtain new results. 
Regular Seminar Mariana Grana (IPhT Saclay)
at: 14:00 room G O Jones 610  abstract: TBA 
Regular Seminar Martin Zirnbauer (University of Cologne)
at: 14:00 room G O Jones 610  abstract: The scaling behavior near the transition between plateaus of the integer quantum Hall effect has traditionally been interpreted on the basis of a twoparameter renormalization group flow conjectured from the nonlinear sigma model of Pruisken. Yet, this scaling picture never led to any analytical understanding of the critical point. Here we propose a novel description of the critical point as Pruisken's nonlinear sigma model coupled to a maximally gauged WessZuminoWitten model of level 4. This proposal explains the existing numerical data for the multifractal scaling exponents of critical wavefunctions. 
Regular Seminar Daniel Jafferis (Harvard U.)
at: 14:00 room G O Jones 610  abstract:

Triangular Seminar Petr Horava (UC Berkeley)
at: 15:00 room Peoples Palace PP01  abstract:

Regular Seminar Radu Tatar (Liverpool U.)
at: 14:00 room G O Jones 610  abstract: Brane construction with certain boundary conditions are used to study knot invariants and Khovanov homology. We argue that sevendimensional manifolds in Mtheory give rise to the topological theories may appear from certain twisting of the Gflux action. We discuss explicit constructions of the sevendimensional manifolds in Mtheory, and show that both the localization equations and surface operators appear naturally from the Hamiltonian formalism of the theories. Knots and link invariants are then constructed using M2brane states in both the models. 
Regular Seminar Axel Kleinschmidt (MPI Potsdam)
at: 14:00 room G O Jones 610  abstract: Exceptional geometry is an attempt to combine the geometric diffeomorphisms and matter gauge transformations in gravitymatter theories into a single geometric structure. I will review recent results associated with a 2+9 split of maximal supergravity where the affine symmetry group E9 plays a central role. The results also provide a general formula that is applicable to many other cases. 
Regular Seminar Kasper Larsen (U. Southampton)
at: 14:00 room G O Jones 610  abstract: A powerful approach to compute multiloop Feynman integrals is to reduce the integrals to a basis of integrals and set up a firstorder linear system of partial differential equations for the basis integrals. In this talk I will discuss the differential equations that arise when the loop integrals are parametrized in Baikov representation. In particular, I give a proof that dimension shifts (which are undesirable) can always be avoided. I will moreover show that in a large class of two and threeloop diagrams it is possible to avoid integrals with squared propagators in the intermediate stages of setting up the differential equations. This is interesting because it implies that the differential equations can be set up using a smaller set of reductions. 
Regular Seminar David Evans ()
at: 14:00 room G O Jones 610  abstract: I will discuss the programme to understand conformal field theory via subfactors and twisted equivariant Ktheory. This has also resulted in a better understanding of the double of the Haagerup subfactor, which was previously thought to be exotic and unrelated to known models. 
Regular Seminar Alexandros Anastasiou (NORDITA)
at: 14:00 room G O Jones 610  abstract: Squaring involves the tensoring between the state content of two super YangMills (sYM) theories to obtain the state content of a supergravity theory. Understanding the YM origin of gravitational symmetries is a powerful tool towards classifying gravity theories which admit such a factorisation. In the first part of the talk I will show how the global symmetries of a pair of sYM theories combine to form those of the corresponding supergravity. In the second part I will discuss how these tools can be further extended to sYM coupled to matter such that squaring can give all ungauged N=2 supergravities with homogeneous scalar manifold. 
Regular Seminar Hans Bantilan (QMUL)
at: 14:00 room G O Jones 610  abstract: The main purpose of this talk is to describe, by way of concrete examples, how the field of numerical relativity now contributes to our understanding of open questions in gravitational collapse, heavyion physics, and turbulence. I will begin by motivating these studies in terms of the physical systems they are intended to clarify,then provide specific examples of how to describe these systems with numerical simulations of asymptotically AdS spacetimes in the fully nonlinear regime of general relativity. 
Regular Seminar Joan Simon (U. of Edinburgh)
at: 14:00 room G O Jones 610  abstract: The relation between black holes and thermodynamics leading to the holographic principle is well known. Formulating thermodynamics as the theory of transformations performing some work or task allows us to reinterpret recent developments in AdS/CFT, such as the holographic description of entanglement entropy, as a measure of the connectivity of space (resource). Whether spacetime in the interior of a black hole also allows an understanding as a resource is an interesting open question. 
Regular Seminar Santiago Cabrera Marquez (Imperial College London)
at: 14:00 room G O Jones 610  abstract: Type IIB superstring brane configurations can have a low energy dynamics described by an effective 3d N=4 gauge theory. The moduli space of the gauge theory is normally a Hyperkähler variety. Singular points in the variety correspond to brane configurations where some fields become massless, giving rise to the Higgs mechanism. I will explain the relevance of a set of theories whose moduli space is the closure of a nilpotent orbit of Lie(F), where F is the flavour symmetry group of the theory. I will show how the mathematical description of the "transverse slice" between two nilpotent orbits can be understood in terms of brane dynamics as a realisation of the Higgs mechanism. 
Triangular Seminar Sanjaye Ramgoolam (QMUL)
at: 11:00 room GO Jones 610  abstract: These lectures will be focused on aspects of combinatorics relevant to gaugestring duality (holography). The physical theories we will discuss include two dimensional Yang Mills theory, fourdimensional N=4 super Yang Mills theory with U(N) gauge group, Matrix and tensor models. The key mathematical concepts include : Schur Weylduality, permutation equivalence classes and associated discrete Fourier transforms as an approach to counting problems and, branched covers and Hurwitz spaces. SchurWeyl duality is a powerful relation between representations of U(N) and representations of symmetric groups. Representation theory of symmetric groups offers a method to define nice bases for functions on equivalence classes of permutations. These bases are useful in counting gauge invariant functions of matrices or tensors, as well as computing their correlators in physical theories. In AdS/CFT these bases have proved useful in identifying local operators in gaugetheory dual to giant gravitons in AdS. In the simplest cases of gaugestring duality, the known mathematics of branched covers and Hurwitz spaces provide the mechanism for the holographic correspondence between gauge invariants and stringy geometry. (Lecture 3: Hermitian matrix model. Tensor models and Permutation centralizer al gebras. Using permutation equivalences to count matrix/tensor invariants and compute correlators. Relations to covering spaces.) 
Triangular Seminar Sanjaye Ramgoolam (QMUL)
at: 11:00 room GO Jones 610  abstract: These lectures will be focused on aspects of combinatorics relevant to gaugestring duality (holography). The physical theories we will discuss include two dimensional Yang Mills theory, fourdimensional N=4 super Yang Mills theory with U(N) gauge group, Matrix and tensor models. The key mathematical concepts include : Schur Weylduality, permutation equivalence classes and associated discrete Fourier transforms as an approach to counting problems and, branched covers and Hurwitz spaces. SchurWeyl duality is a powerful relation between representations of U(N) and representations of symmetric groups. Representation theory of symmetric groups offers a method to define nice bases for functions on equivalence classes of permutations. These bases are useful in counting gauge invariant functions of matrices or tensors, as well as computing their correlators in physical theories. In AdS/CFT these bases have proved useful in identifying local operators in gaugetheory dual to giant gravitons in AdS. In the simplest cases of gaugestring duality, the known mathematics of branched covers and Hurwitz spaces provide the mechanism for the holographic correspondence between gauge invariants and stringy geometry. (Lecture 2: Local gauge invariant operators and Hilbert space of CFTs. Young diagrams and Brane geometries. HalfBPS and quarterBPS. Counting, construction and correlators in group theoretic combinatorics.) 