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)
Exceptional Seminar Various Various (Various)
at: 9:30 room GO Jones 610  abstract: Collabor8 is a daylong meeting for early career researchers in mathematical and theoretical physics on Thursday 18th February 2016. The purpose of the meeting is to encourage collaboration between PhD students and postdocs from different institutions and research specialisms working in the UK. The meeting will feature short presentations from selected speakers about ongoing research problems, in contrast to traditional longer seminars on completed work. These will form the basis of group discussions, where participants may share their expertise and suggest new approaches. The conference website provides a convenient social network to promote continuing interaction after the meeting. We are delighted that Professor Luis Fernando Alday will be delivering a keynote lecture at the meeting. There is no conference fee, and funds are available to reimburse travel expenses. Further information about the meeting, including the registration form, may be found on the website below. The deadline for registration is Thursday 4th February. http://www.collabor8research.org 
Regular Seminar Paul Mansfield (Durham)
at: 14:00 room G.O. Jones 610  abstract: I will show that the matter content of the Standard Model takes a simple form when expressed in terms of worldlines of spinning particles and set this in the context of an effective string theory of the Standard Model described by tensionless spinning strings with contact interactions. 
Regular Seminar Lorenzo Bianchi (DESY Hamburg)
at: 14:00 room G.O. Jones 610  abstract: In the last fifteen years an extensive and successful program has been carried out, consisting in the application of integrability techniques to the study of the AdS/CFT correspondence in the planar limit. In this talk we focus on a particular string background corresponding, on the dual side, to the expectation value of a cusped Wilson line. Recently the study of this background has been boosted by the OPE program for polygonal Wilson loops and scattering amplitudes. In this talk we consider the quantum fluctuations of the worldsheet theory around the null cusp classical solution and we investigate various quantities of physical interest (free energy, dispersion relation, Smatrix) in the perturbative expansion at strong coupling. We also propose a possible discretization of this model which can be used to study the theory nonperturbatively through numerical lattice simulations. 
Regular Seminar Anthony Ashmore (Imperial College)
at: 14:00 room G.O. Jones 610  abstract: CalabiYau manifolds without flux are perhaps the bestknown supergravity backgrounds that leave some supersymmetry unbroken. The supersymmetry conditions on such spaces can be rephrased as the existence and integrability of a particular geometric structure. When fluxes are allowed, the conditions are more complicated and the analogue of the geometric structure is not well understood. In this talk, I will define the analogue of CalabiYau geometry for generic D=4, N=2 backgrounds with flux in both type II and elevendimensional supergravity. The geometry is characterised by a pair of Gstructures in 'exceptional generalised geometry' that interpolate between complex, symplectic and hyperKahler geometry. Supersymmetry is then equivalent to integrability of the structures, which appears as moment maps for diffeomorphisms and gauge transformations. Similar structures also appear in D=5 and D=6 backgrounds with eight supercharges. As a simple application, I will discuss the case of AdS5 backgrounds in type IIB, where deformations of these geometric structures give exactly marginal deformations of the dual field theories. 
Regular Seminar Geoffrey Compere (ULB)
at: 14:00 room G.O. Jones 610  abstract: Symmetries are crucial in physics. Here I will develop the concept of symplectic symmetry for Einstein gravity, which is an extension of the concept of asymptotic symmetries. I will then show that the throat of the extremal Kerr black hole admits symplectic symmetries, which leads to an infinite number of conserved charges which form a Virasoro algebra in 4 dimensions and a novel generalized Virasoro algebra in higher dimensions. I will build explicitly the geometries that carry these charges, the socalled "descendants" of the extremal black hole, in the nearhorizon region. 
Triangular Seminar Gong Show (IC/KCL/CU/QMUL)
at: 15:00 room LG1  abstract: Student Triangles are a chance for PhD students to give talks to their fellow PhD students from the London Universities, without the pressure of presenting in front of academics. For this first student triangle of the year we will be holding a gong show with a series of short whiteboard talks. PhD students can sign up for a gong show slot on http://doodle.com/poll/ehgri6kz6f6a8cux 
Regular Seminar YangHui He (City)
at: 14:00 room G.O. Jones 610  abstract: We study the web of correspondences linking the exceptional Lie algebras E8,7,6 and the sporadic simple groups Monster, Baby and the largest Fischer group. We will survey some old observations from the perspective of Moonshine and representation theory and present some new ones from that of congruence groups and enumerative geometry. Based on joint work with John McKay. 
Regular Seminar Diego RodriguezGomez (Universidad de Oviedo)
at: 14:00 room G.O. Jones 610  abstract: 5d theories can be at fixed points, in many cases exhibiting rather amusing properties. In this talk we will study several properties of these fixed point theories. In particular, we will describe how to put them supersymmetrically in curved spaces. As a consequence, we will discuss when a deformation to a YangMills theory is possible. The latter typically exhibit a smaller global symmetry that that of the fixed point theory, which, from the YM point of view, appears as an enhanced symmetry. In this enhancement instantons play a pivotal role, and we will discuss several aspects of these. 
Triangular Seminar Diego RodriguezGomez (University of Oviedo)
at: 15:00 room GO Jones 610  abstract: Counting operators in supersymmetric field theories is very interesting, as the corresponding generating functions encode properties of the field theory. In this lecture we will mostly concentrate on 4d SUSY field theories. After reviewing some basic notions about SUSY field theories leading to the notion of chiral ring, we will introduce a generating function enumerating operators in the ring. This function is the socalled Hilbert series. In the case of SCFTs with a gravity dual, we will show how this function recovers geometric properties of the dual gravity background. The uses of the Hilbert series go beyond this, since, as we will see, being a counting of operators, it is of relevance in the computation of instanton partition functions for pure gauge theories. In the second part of the lecture we will briefly touch upon these issues. 
Regular Seminar Julian Sonner (University of Geneva)
at: 14:00 room G.O. Jones 610  abstract: The recent focus on entanglement entropy in holography has many motivations, ranging from the applied (e.g. AdS/CMT) to the foundational (emergence of gravity). For all of these programs It is important to find examples, where the quantities of interest can be directly calculated in stronglycoupled field theories and, moreover, the dual geometry constructed at strong coupling. In this talk I will describe joint work with Crossley and Dyer on using localization methods to obtain entanglement and (super) Renyi entropies of the N=4 SYM theory with gauge group SU(N) in 4D at all values of the ’t Hooft coupling \lambda and number of colors N. Since obtaining quantities like entanglement and Renyi entropies involves working on singular spaces, which typically break the supersymmetry, we focus on a supersymmetric generalization, the socalled superRenyi entropy where the supersymmetry breaking effects of the singularities are suitably compensated. I will also discuss dual gravity solutions as fivedimensional BPS black holes with hyperbolic horizon. I will conclude with a description of Wilson loops, that is the contribution to the entanglement and Renyi entropies due to adding fundamental matter to the theory. 
Informal Seminar Rodolfo Russo (Queen Mary)
at: 10:00 room GO Jones 610  abstract: Lecture 3: An example of mixed open/closed amplitudes 
Informal Seminar Rodolfo Russo (Queen Mary)
at: 10:00 room GO Jones 610  abstract: Lecture 2: Derivation of the VirasoroShapiro amplitude; 4 graviton amplitude in the superstring (no derivation, but discussion of the low and high energy limits) 
Informal Seminar Rodolfo Russo (Queen Mary)
at: 10:00 room GO Jones 610  abstract: Lecture 1: Veneziano amplitude: derivation, low and high energy limits 
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:
