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 Balt van Rees (Durham)
at: 14:00 room G.O. Jones 610  abstract: In recent years we have witnessed a revival of the conformal bootstrap approach to CFTs. I will discuss the application of these ideas to sixdimensional conformal field theories with (2,0) supersymmetry, focusing on the universal fourpoint function of stress tensor multiplets. For these theories the program splits into an analytic and a numerical component. The analytic component yields exact results but in a protected subsector. The numerical component can be used to derive bounds on OPE coefficients and scaling dimensions from the constraints of crossing symmetry and unitarity. The principal numerical result is strong evidence that the A1 theory realizes the minimal allowed central charge (c=25) for any interacting (2,0) theory. This implies that the full stress tensor fourpoint function of the A1 theory is the unique unitary solution to the crossing symmetry equation at c=25. For this theory, we can estimate the scaling dimensions of the lightest unprotected operators appearing in the stress tensor operator product expansion. We also find rigorous upper bounds for dimensions and OPE coefficients for a general interacting (2,0) theory of central charge c. For large c, our bounds appear to be saturated by the holographic predictions obtained from elevendimensional supergravity. 
Colloquium Ginestra Bianconi (Queen Mary)
at: 16:15 room G O Jones Lecture Theatre  abstract: Networks are mathematical structures that are universally used to describe a large variety of complex systems such as the brain or the Internet. Characterizing the geometrical properties of these networks has become increasingly relevant for routing problems, inference and data mining. In real growing networks, topological, structural and geometrical properties emerge spontaneously from their dynamical rules. Here we show that a single two parameter model of emergent network geometry, constructed by gluing triangles, can generate complex network geometries with nontrivial distribution of curvatures, combining exponential growth and smallworld properties with finite spectral dimensionality. In one limit, the nonequilibrium dynamical rules of these networks can generate scalefree networks with clustering and communities, in another limit 2 dimensional manifolds with nontrivial modularity. When manifolds of arbitrary dimension are constructed, and energies are assigned to their nodes these networks can be mapped to quantum network states and they follows quantum statistics despite they do not obey equilibrium statistical mechanics. 
Journal Club Ehsan Hatefi (Queen Mary)
at: 14:00 room G.O. Jones 610  abstract: We start by providing complete insights about the standard ways of finding couplings in effective field theory , and present most of the supersymmetric and nonsupersymmetric scattering amplitudes of both type IIA,IIB superstring theory as well as their corrections. We would also like to address the way of obtaining a universal conjecture for DBI, ChernSimons and new Wess Zumino actions with their corrections. We then move on to provide a comprehensive explanation even for D braneanti Dbrane systems, where various new techniques will be also illustrated. If time allows , we then mention several issues related to those effective actions and eventually highlight some open problems. 
Regular Seminar Piotr Tourkine (Cambridge)
at: 14:00 room G.O. Jones 610  abstract: Remarkable formulae for the treelevel Smatrix of gauge and gravity theories were recently discovered by CachazoHeYuan, based on a localisation procedure in the moduli space of Riemann surfaces. These formulae are now known to arise from new stringlike chiral models. These naturally produces looplevel amplitudes, also localised in the moduli space of higher genus curves. However, the resolution of the localisation equations is immensely more difficult than at treelevel, and it remained as an open question as to what these formulae computed, and more generally if these string models made sense at the quantum level. In this talk I'll describe a resolution of the localisation equations at oneloop in a particular kinematical regime, and show agreement with known amplitudes. Then I'll describe a much more powerful method, based on an integration by parts which degenerates the torus down to a sphere (plus two new points). The model is then solved like at treelevel. I'll briefly discuss extension to higher loops in conclusion. 
Regular Seminar Marco Chiodaroli (MPI)
at: 16:00 room G.O. Jones 610  abstract: The talk reports on recent progress in amplitude computations for broad classes of N=2 MaxwellEinstein and YangMillsEinstein supergravities, using the framework provided by color/kinematics duality and the doublecopy construction. After a review of the main theoretical tools employed in the computations, we discuss the extension of the doublecopy construction to a particular infinite family of N=2 MaxwellEinstein supergravities in four and five dimensions and show that the global symmetries of these theories can easily be gauged, giving the amplitudes of the corresponding YangMillsEinstein supergravities. Finally, we discuss how the construction can be modified to describe spontaneous symmetry breaking and present examples at one loop. 
Regular Seminar Paul Heslop (Durham)
at: 14:00 room G.O. Jones 610  abstract: We will show how to obtain halfBPS fourpoint correlation functions in N=4 SYM at up to 3 loops using symmetries, analytic properties the Wilson loop/correlator duality, planarity and some minimal knowledge of the OPE structure relating fourpoint correlators of different charges. These can be used to verify recent predictions for OPE coefficients arising from integrability. 
Regular Seminar Kazutoshi Ohta (Meiji Gakuin University)
at: 14:00 room G.O. Jones 610  abstract:

Regular Seminar Babak Haghighat (Harvard)
at: 14:00 room G.O. Jones 610  abstract: We consider bound states of strings which arise in 6d (1,0) SCFTs that are realized in Ftheory in terms of linear chains of spheres with negative selfintersections 1,2, and 4. These include the strings associated to N small E8 instantons, as well as the ones associated to M5 branes probing A and D type singularities in Mtheory or D5 branes probing ADE singularities in Type IIB string theory. We find that these bound states of strings admit (0,4) supersymmetric quiver descriptions and show how one can compute their elliptic genera. 
Regular Seminar Harald Ita (Freiburg U.)
at: 14:00 room G.O. Jones 610  abstract: In this talk we present recent advances on NLO QCD corrections, performed with BlackHat+SHERPA, to processes with many jets in the final state relevant for the LHC. Furthermore, we will discuss the importance of scattering amplitudes for developing strategies to measure the "out of reach" parameters of the Higgs boson. 
Regular Seminar Paul Richmond (Oxford)
at: 14:00 room G.O. Jones 610  abstract: I will discuss how to construct rigid supersymmetric gauge theories on Riemannian fivemanifolds following a holographic approach. This approach realises the fivemanifold as the conformal boundary of a sixdimensional bulk supergravity solution and leads to a systematic classification of fivedimensional supersymmetric backgrounds with gravity duals. The background metric is furnished with a conformal Killing vector, which generates a transversely holomorphic foliation with a transverse Hermitian structure. Finally, I’ll also construct supersymmetric Lagrangians for gauge theories coupled to arbitrary matter on such backgrounds. 
Regular Seminar Simon CaronHuot (NBI)
at: 14:00 room G.O. Jones 610  abstract: Physical systems with unexpected, or `hidden,’ symmetries have often played an important role in physics, beginning with the classical Kepler problem whose LaplaceRungeLenz vector ensures the closure of planetary orbits, and degeneracies of the Hydrogen spectrum. I will describe how precisely the same symmetry governs a unique fourdimensional quantum field theory, a maximally supersymmetric (`N=4') cousin of the stronginteraction YangMills theory. After reviewing progress in recent years in using these symmetries to solve this model, I will describe novel applications involving massive particles. Combining the LaplaceRungeLenz vector with relativity then yields a novel way to calculate the spectrum of its Hydrogenlike bound states, including relativistic corrections. Based on 1408.0296. 
Regular Seminar Chris Hull (Imperial College)
at: 14:00 room G.O. Jones 610  abstract: One of the ways in which string theory differs from conventional field theories is that it has duality symmetries, which allow the construction of socalled nongeometric backgrounds, such as Tfolds which have Tduality transition functions. String theory on a torus requires the introduction of dual coordinates conjugate to string winding number. This leads to physics and novel geometry in a doubled space, with nontrivial dynamics in the full doubled spacetime. The geometry and physics of doubled spacetime will be developed and discussed. 
Regular Seminar Pietro Longhi (Rutgers University)
at: 14:00 room G.O. Jones 610  abstract: The BPS spectra of Class S theories are among the best understood, thanks in part to a construction known as Spectral Networks. We will review this framework and recent developments of it, and present results obtained through their applications. 
Informal Seminar David Berman (QMUL)
at: 14:30 room G.O. Jones 610  abstract: Graduate Lectures: This short course will cover the origin of Mtheory and brane physics with its applications. 
Regular Seminar Christian Saemann (Edinburgh)
at: 14:00 room G.O. Jones 610  abstract: Higher Gauge Theory is a categorical way of thinking about parallel transport of extended objects. Such parallel transport appears naturally within string and Mtheory. In particular, the sixdimensional maximally superconformal theory or at least selfdual strings in four dimensions should be captured by Higher Gauge Theory. I will review some of my recent work in this area, including how M2brane models fit into the picture, how twistor geometry can yield field equations containing the nonabelian tensor multiplet and give explicit higher versions of the BPST instanton and the 't HooftPolyakov monopole. If time permits, I will also talk a bit about a higher version of the IKKT matrix model. 
Regular Seminar Benjamin Basso (ENS Paris)
at: 14:00 room G.O. Jones 610  abstract: In this talk I will explain how to compute gluon scattering amplitudes at finite coupling in planar N=4 SYM theory, using the duality with null polygonal Wilson loops, conformal symmetry, and the integrability of the colour flux tube dynamics. After introducing the main ideas and results, I will present some applications of this formalism at strong coupling and discuss the validity of the semiclassical (dual) string description. 
Triangular Seminar Simon Ross (Durham)
at: 15:00 room Peoples Palace PP2  abstract:

Triangular Seminar Nikolay Bobev (Leuven)
at: 16:30 room Peoples Palace PP2  abstract: I will discuss the gravitational dual of a mass deformation of N=4 SYM, called N=2* SYM, on S^4. Using holographic techniques one can calculate the universal contribution to the corresponding free energy in the planar limit and at large 't Hooft coupling. The result matches the expression recently computed using supersymmetric localization in the field theory. This agreement constitutes a nontrivial precision test of holography in a nonconformal setting. I will also briefly discuss the extension of these results to mass deformations of N=4 SYM with N=1 supersymmetry. 
Informal Seminar David Berman (QMUL)
at: 14:30 room G.O. Jones 610  abstract: Graduate Lectures: This short course will cover the origin of Mtheory and brane physics with its applications. 
Regular Seminar Mukund Rangamani (Durham)
at: 14:00 room G.O. Jones 610  abstract: CFTs at large central charge display some universal features which can be inferred from holography. Using these as a guide one can obtain some necessary conditions for a given CFT to admit a classical string dual. I will describe attempts to construct a large class of CFTs satisfying these conditions exploiting some technology of permutation orbifolds. 