## Directions

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 15-20 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.

## Seminars at Queen Mary University of London

Found at least 20 result(s)

### 08.10.2015 (Thursday)

#### Higher charge half-BPS four-point correlation functions in planar N=4 SYM

Regular Seminar Paul Heslop (Durham)

 at: 14:00 QMWroom G.O. Jones 610 abstract: We will show how to obtain half-BPS four-point 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 four-point correlators of different charges. These can be used to verify recent predictions for OPE coefficients arising from integrability.

### 30.06.2015 (Tuesday)

#### Localization in Quiver Quantum Mechanics

Regular Seminar Kazutoshi Ohta (Meiji Gakuin University)

 at: 14:00 QMWroom G.O. Jones 610 abstract:

### 25.06.2015 (Thursday)

#### Strings of 6d SCFTs

Regular Seminar Babak Haghighat (Harvard)

 at: 14:00 QMWroom G.O. Jones 610 abstract: We consider bound states of strings which arise in 6d (1,0) SCFTs that are realized in F-theory in terms of linear chains of spheres with negative self-intersections 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 M-theory 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.

### 21.05.2015 (Thursday)

#### Multijet Predictions for the LHC

Regular Seminar Harald Ita (Freiburg U.)

 at: 14:00 QMWroom 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.

### 07.05.2015 (Thursday)

#### Supersymmetric gauge theories on five-manifolds

Regular Seminar Paul Richmond (Oxford)

 at: 14:00 QMWroom G.O. Jones 610 abstract: I will discuss how to construct rigid supersymmetric gauge theories on Riemannian five-manifolds following a holographic approach. This approach realises the five-manifold as the conformal boundary of a six-dimensional bulk supergravity solution and leads to a systematic classification of five-dimensional 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.

### 30.04.2015 (Thursday)

#### Hidden symmetries of scattering amplitudes (and of Hydrogen atom)

Regular Seminar Simon Caron-Huot (NBI)

 at: 14:00 QMWroom 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 Laplace-Runge-Lenz vector ensures the closure of planetary orbits, and degeneracies of the Hydrogen spectrum. I will describe how precisely the same symmetry governs a unique four-dimensional quantum field theory, a maximally supersymmetric (N=4') cousin of the strong-interaction Yang-Mills 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 Laplace-Runge-Lenz vector with relativity then yields a novel way to calculate the spectrum of its Hydrogen-like bound states, including relativistic corrections. Based on 1408.0296.

### 23.04.2015 (Thursday)

#### Double Field Theory and Stringy Geometry

Regular Seminar Chris Hull (Imperial College)

 at: 14:00 QMWroom 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 so-called non-geometric backgrounds, such as T-folds which have T-duality 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 non-trivial dynamics in the full doubled space-time. The geometry and physics of doubled space-time will be developed and discussed.

### 09.04.2015 (Thursday)

#### Spectral Networks: Extensions and Applications

Regular Seminar Pietro Longhi (Rutgers University)

 at: 14:00 QMWroom 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.

### 30.03.2015 (Monday)

Informal Seminar David Berman (QMUL)

 at: 14:30 QMWroom G.O. Jones 610 abstract: Graduate Lectures: This short course will cover the origin of M-theory and brane physics with its applications.

### 26.03.2015 (Thursday)

#### Higher Gauge Theory and M-Theory

Regular Seminar Christian Saemann (Edinburgh)

 at: 14:00 QMWroom 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 M-theory. In particular, the six-dimensional maximally superconformal theory or at least self-dual strings in four dimensions should be captured by Higher Gauge Theory. I will review some of my recent work in this area, including how M2-brane models fit into the picture, how twistor geometry can yield field equations containing the non-abelian tensor multiplet and give explicit higher versions of the BPST instanton and the 't Hooft-Polyakov monopole. If time permits, I will also talk a bit about a higher version of the IKKT matrix model.

### 12.03.2015 (Thursday)

#### Gluon scattering amplitudes as flux-tube partition functions

Regular Seminar Benjamin Basso (ENS Paris)

 at: 14:00 QMWroom 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.

### 11.03.2015 (Wednesday)

#### Multiboundary wormholes and holographic entanglement

Triangular Seminar Simon Ross (Durham)

 at: 15:00 QMWroom Peoples Palace PP2 abstract:

### 11.03.2015 (Wednesday)

#### Holography for N=2(star) on S4

Triangular Seminar Nikolay Bobev (Leuven)

 at: 16:30 QMWroom 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 non-trivial precision test of holography in a non-conformal setting. I will also briefly discuss the extension of these results to mass deformations of N=4 SYM with N=1 supersymmetry.

### 09.03.2015 (Monday)

Informal Seminar David Berman (QMUL)

 at: 14:30 QMWroom G.O. Jones 610 abstract: Graduate Lectures: This short course will cover the origin of M-theory and brane physics with its applications.

### 05.03.2015 (Thursday)

#### Permutation orbifolds and holography

Regular Seminar Mukund Rangamani (Durham)

 at: 14:00 QMWroom 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.

### 04.03.2015 (Wednesday)

Informal Seminar David Berman (QMUL)

 at: 14:30 QMWroom G.O. Jones LG1 abstract: Graduate Lectures: This short course will cover the origin of M-theory and brane physics with its applications.

### 25.02.2015 (Wednesday)

Informal Seminar David Berman (QMUL)

 at: 14:30 QMWroom G.O. Jones LG1 abstract: Graduate Lectures: This short course will cover the origin of M-theory and brane physics with its applications.

### 19.02.2015 (Thursday)

#### Quantum Gravity and the Stbility of the Higgs Vacuum

Regular Seminar Jan Plefka (Humboldt)

 at: 14:00 QMWroom G.O. Jones 610 abstract: A central outcome of the recent Higgs discovery is that the Standard Model (SM) appears to be a selfconsistent quantum field theory all the way up to the Planck scale. Moreover, the measured values for the Higgs and top masses have an intriguing consequence for the question of stability of the Higgs vacuum: The SM lies close to the border of absolute electroweak vacuum stability and metastability. However, these celebrated results extrapolate the SM into a region where quantum gravity effects become important. We have therefore computed the quantum gravitational contributions to the standard model effective potential and analyzed their effects on the Higgs vacuum stability in the framework of effective field theory. Non-renormalizability of Einstein gravity induces higher dimension φ6 and φ8 operators at the one- loop level with novel couplings η1/2. We find that the true minimum of the standard model effective potential now lies below the Planck scale for almost the entire parameter space (η1/2(mt) > 0.01). In addition quantum gravity is shown to contribute to the minimal value of the standard model NLO effective potential at the percent level. The quantum gravity induced contributions yield a metastable vacuum for a large fraction of the parameter space in the flowing couplings η1/2.

### 12.02.2015 (Thursday)

#### Extremal chiral ring states in AdS/CFT are described by free fermions

Regular Seminar David Berenstein (UCSB)

 at: 14:00 QMWroom G.O. Jones 610 abstract: Half BPS states (operators) in N=4 SYM are famously described by free fermions both at weak and strong coupling. I describe a set of conjectures for a preferred class of states in more general conformal field theories that can be tested in supergravity for when such a free fermion description might arise and some motivation for it applying generally. The states in question belong to the chiral ring of a supersymmetric conformal field theory that extremize an additional U(1) charge for fixed dimension and can be reduced to multi-traces of a composite matrix field, which is equivalent to using Young tableaux (Schur polynomials) as a basis. The main conjecture asserts that if the Young tableaux are orthogonal, then the set of extremal three point functions of traces to order 1/N are determined up to a single constant. The conjecture is extended further by providing an exact norm for the Schur basis and this norm arises from a set of free fermions for a generalized oscillator algebra.

### 05.02.2015 (Thursday)

#### Introduction to pure spinor methods for string- and field-theory amplitudes

Regular Seminar Oliver Schlotterer (AEI Potsdam)

 at: 14:00 QMWroom G.O. Jones 610 abstract: In this talk, I will review basic features of the pure spinor superstring as well as recent progress to compute and compactly represent scattering amplitudes in this framework. A string-inspired organization scheme for amplitudes in both field- and string-theories will be described where the non-linearities of ten-dimensional super Yang-Mills theory are encoded in so-called multiparticle superfields. They allow to efficiently capture the polarization dependence through cubic diagrams where the intuitive mapping as well as the composition rules for amplitudes are guided by BRST invariance.