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 Mehrnoosh Sadrzadeh (QMUL)
at: 14:00 room G.O. Jones 610  abstract: Mathematical models of natural language can be organised into logical and statistical. The former are based on grammatical structures of phrases and sentences and the latter on distributions of words in corpora of text. In joint work with Clark (Cambridge) and Coecke (Oxford), we developed a unifying framework where the distributions of words are composed to form distributions for phrases and sentences. This expanded the application domains of the statistical models  e.g. automatic reasoning about similarity  from words to phrases and sentences. On the theoretical side, our model extends the wordbased setting from vectors to tensors. Tensors are main players in the mathematical models of quantum mechanics. In this talk, I will review the theory and applications of our model in simple terms and through examples. I will briefly explain how `entanglement', a concept arising from tensors in quantum mechanics, manifests itself and is used as a resource in the linguistic applications. I will also explain how the reasoning toolkit used in this model is the same as that of Abramsky and Coecke in their categorical Quantum Mechanics model. 
Regular Seminar Hans Bantilan (QMUL)
at: 14:00 room G.O. Jones 610  abstract: The collision of black holes is a classic problem in the strongfield regime of general relativity, with no known closedform solution. When exact solutions are not known, or perturbative expansions about known solutions are inadequate to capture the nonlinear dynamics, the numerical solution of the Einstein field equations is required. The main purpose of this talk is to describe, in detail, the necessary ingredients for achieving stable Cauchy evolution of black hole collisions in asymptotically antide Sitter (AdS) spacetimes. I will begin by motivating this program in terms of the heavyion physics it is intended to clarify. I will then give an overview of antide Sitter space, the mapping to its dual boundary conformal field theory, and the method we use to numerically solve the fully nonlinear Einstein field equations with AdS boundary conditions. As a concrete example of these ideas, I will describe simulations of stable AdS black hole mergers in 5 dimensions. 
Regular Seminar Iosif Bena (Saclay)
at: 14:00 room G.O. Jones 610  abstract: Antibranes in backgrounds that have charge dissolved in fluxes are a key ingredient in constructing a landscape (Multiverse) of deSitter vacua in String Theory, and also of constructing microstate solutions corresponding to nonsupersymmetric nearextremal black holes. There are several regimes of parameters in which one can study the physics of these antibranes, and I will show that in the regime of parameters where their gravitational backreaction is important, antibranes have a naked singularity that cannot be resolved either by brane polarization or by cloaking with a black hole horizon, and that signals a tachyonic instability. I will also present recent evidence that the theory on the wordvolume of antiD3 branes is finite to all loops. I will conclude by discussing the implications of these results for the Multiverse paradigm and for the Fuzzball proposal. 
Regular Seminar Manuela Kulaxizi (Trinity College Dublen)
at: 14:00 room G.O. Jones 610  abstract: We discuss the energy flux constraints for conserved and nonconserved operators in an arbitrary higher dimensional CFT. We then consider a deep inelastic scattering thought experiment and show how to derive these and other bounds on the OPE coefficients of various operators. 
Regular Seminar Alvaro Veliz Osorio (QMUL)
at: 14:00 room G.O. Jones 610  abstract: We investigate measures of chaos and entanglement scrambling in rational conformal field theories in 1+1 dimensions. First, we derive a formula for the late time value of the outoftimeorder correlators for these class of theories. Our universal result can be expressed as a particular combination of the modular Smatrix elements known as anyon monodromy scalar. Next, in the explicit setup of a SU(N)k WZW model, we compare the late time behaviour of the outoftime correlators and the purity. Interestingly, in the largec limit, the purity grows logarithmically but the outoftimeorder correlators remain constant. Therefore, we find that some systems may display entanglement scrambling in the absence of chaos. 
Regular Seminar Madalena Lemos (DESY Hamburg)
at: 14:00 room G.O. Jones 610  abstract: In this talk we will discuss the bootstrap program applied to fourdimensional N=2 superconformal field theories, with focus on analytical results. After a brief review of the protected subsector captured by a twodimensional chiral algebra, we will show how analytic bounds on anomaly coefficients are obtained and constrain the space of allowed SCFTs. Finally we will comment the implications for the numerical bootstrap program. 
Regular Seminar Sara Pasquetti (Surrey U.)
at: 14:00 room G.O. Jones 610  abstract: I will present several new 3d N=2 dualities with superpotentials involving monopole operators. Some of the theories that I will discuss describe systems of D3 branes ending on pqwebs. In these cases 3d mirror symmetry is a consequence of Sduality. 
Triangular Seminar Joerg Teschner (DESY)
at: 15:00 room Maths Lecture Theatre  abstract:

Triangular Seminar Malcolm Perry (DAMTP)
at: 16:30 room Maths Lecture Theatre  abstract:

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 