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)

04.03.2015 (Wednesday)

Graduate Lectures: M-theory

Informal Seminar David Berman (QMUL)

at:
14:30 QMW
room 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)

Graduate Lectures: M-theory

Informal Seminar David Berman (QMUL)

at:
14:30 QMW
room 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 QMW
room 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 QMW
room 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 QMW
room 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.

04.02.2015 (Wednesday)

Aspects of Gauge-Strings Duality

Regular Seminar Carlos Nunez (Swansea U.)

at:
16:00 QMW
room G.O. Jones 610
abstract:

I will discuss recent developments in the duality between gauge fields and strings.

29.01.2015 (Thursday)

Higher Spin Holography

Regular Seminar Robert de Mello Koch (Witwatersrand U.)

at:
14:00 QMW
room G.O. Jones 610
abstract:

In this talk we will discuss the collective field theory approach towards understanding the holographic duality between Vasiliev's minimal higher spin theory in AdS4 and the free O(N) vector model in 2+1 dimensions.

28.01.2015 (Wednesday)

On black hole thermodynamics from super Yang-Mills

Regular Seminar Toby Wiseman (Imperial College)

at:
15:15 QMW
room G.O. Jones 610
abstract:

I will review the link between 1+p dimensional maximally supersymmetric Yang-Mills and the black hole thermodynamics of Dp-branes via the gauge/string correspondence. The finite temperature behaviour of Dp-brane supergravity black holes looks very alien from the perspective of the dual strongly coupled Yang-Mills. However, I will argue that in a natural set of Yang-Mills variables, the classical moduli (which unfortunately are still strongly coupled), certain features of these thermodynamics become quite transparent.

22.01.2015 (Thursday)

Cancelled

Regular Seminar Kyriakos Papadodimas (CERN)

at:
14:00 QMW
room G.O. Jones 610
abstract:

08.01.2015 (Thursday)

Functional determinants, index theorems and exact quantum black hole entropy.

Regular Seminar Sameer Murthy (King's)

at:
14:00 QMW
room G.O. Jones 610
abstract:

I will discuss the exact quantum entropy of supersymmetric black holes as a gravitational functional integral in AdS2. In theories with eight supercharges, a computation of the exact entropy is possible using supersymmetric localization. I will discuss this technique, and describe the computation of functional determinants that can be computed using index theorems. I will then compare the exact gravitational formula to microscopic formulas coming from string theory.

12.12.2014 (Friday)

What is the equation of state for the early Universe?

Exceptional Seminar Samir Mathur (Ohio State)

at:
15:00 QMW
room G.O. Jones Lecture Theatre
abstract:

The Bekenstein-Hawking formula for the entropy of a black hole suggests that entropy in strong gravity situations should be proportional to bounding area rather than enclosed volume. But we argue that the S and T dualities of string theory suggest an entropy formula that is extensive in the volume, with the area formula appearing as a special case. In particular we find a set of states in string theory that violate the covariant entropy bound, which seeks to extend the area entropy formula to situations like the early Universe.

11.12.2014 (Thursday)

Generic Predictions of String/M theory solutions with Low Energy Supersymmetry breaking

Regular Seminar Bobby Acharya (King's)

at:
14:00 QMW
room G.O. Jones 610
abstract:

By studying the cosmological dynamics of the moduli and axion fields we develop a set of "generic predictions" of solutions to string/M theory which have low energy supersymmetry breaking and grand unification. The nature of dark matter plays an important role in much of the discussion.

03.12.2014 (Wednesday)

Polygon Seminar: Gauge Theories and Calabi-Yau Manifolds

Triangular Seminar Yang-Hui He (City University)

at:
15:30 QMW
room Francis Bancroft 1.15
abstract:

27.11.2014 (Thursday)

Interacting UV fixed points - from 4D quantum gauge theories to 4D quantum gravity

Regular Seminar Daniel Litim (Sussex U.)

at:
14:00 QMW
room G.O. Jones 610
abstract:

It is commonly believed that for a quantum field theory to be fundamental, its high-energy behaviour must be governed by an ultraviolet (UV) fixed point. A very satisfying example is given by asymptotic freedom of QCD where the UV fixed point is non-interacting. In this talk, I discuss the existence of interacting UV fixed points in various quantum field theories, in particular in four dimensions, both with and without gravity. Implications for particle physics are also evaluated.

19.11.2014 (Wednesday)

Form factors, Anomalous Dimensions and the Dilatation Operator of N=4 SYM Theory

Regular Seminar Matthias Wilhelm (Humboldt)

at:
16:00 QMW
room G.O. Jones 610
abstract:

We study the form factor of a generic gauge-invariant local composite operator in N=4 SYM theory. At tree-level and for a minimal number of external fields, the form factor exactly realises the spin-chain picture of N=4 SYM theory in the language of scattering amplitudes. Via generalised unitarity, we obtain the cut-constructible part of the one-loop correction to the minimal form factor of a generic operator. Its UV divergence yields the complete one-loop dilatation operator of the theory. We also compute the complete two-loop correction to the two-point form factor of the Konishi operator via unitarity and obtain the two-loop Konishi anomalous dimensions from it. For the Konishi operator as well as other non-protected operators, important subtleties arise which require an extension of the method of unitarity. Moreover, since the inclusion of non-protected operators into the action renders it formally non-supersymmetric, the form factors of these operators share many features with quantities in QCD, such as the occurrence of rational terms. The talk is based on the recent works 1410.6309 and 1410.8485.

13.11.2014 (Thursday)

Holography, Probe Branes and Isoperimetric Inequalities

Regular Seminar Frank Ferrari (Brussels U.)

at:
14:00 QMW
room G.O. Jones 610
abstract:

In many instances of holographic correspondences between a d dimensional boundary theory and a d+1 dimensional bulk, a simple argument in the boundary theory implies that there must exist a direct relation between the on-shell Euclidean gravitational bulk action and the on-shell Euclidean action of a (d-1)-brane probing the bulk geometry. This relation is crucial for the consistency of holography but puzzling from the bulk perspective. We provide a full bulk derivation in the case of pure gravity. A central role is played by a non-trivial isoperimetric inequality that must be satisfied in a large class of Poincaré-Einstein spaces. Remarkably, this inequality follows from a theorem by John Lee.

06.11.2014 (Thursday)

A universal correction to higher spin entanglement entropy

Regular Seminar Michael Ferlaino (Swansea)

at:
14:00 QMW
room G.O. Jones 610
abstract:

Within the context of the duality between higher spin gravitational theories and a semi- classical limit of WN minimal models, we consider 2D CFTs with W1 symmetry at nite temperature, deformed by the presence of a chemical potential for the spin{three current. As a perturbative expansion in the chemical potential, we compute the Renyi and entanglement entropies for a single interval. The leading correction is universal and matches the holographic result, based on Wilson line functionals, obtained from the higher spin gravitational dual.

05.11.2014 (Wednesday)

Enhanced ultraviolet cancellations in supergravity theories

Regular Seminar Zvi Bern (UCLA)

at:
16:00 QMW
room G.O. Jones 610
abstract:

29.10.2014 (Wednesday)

3d and 5d SUSY partition functions as q-deformed CFT correlators

Regular Seminar Fabrizio Nieri (Surrey)

at:
16:00 QMW
room G.O. Jones 610
abstract:

In recent years, due to the method of supersymmetric localization, many exact results have been achieved in the study of supersymmetric gauge theories on compact spaces of various dimension and topology, leading to the discovery of surpraising structures. An important example is provided by the correspondence introduced by Alday, Gaiotto and Tachikawa, relating the partition functions of a large class of supersymmetric gauge theories on S4 and S2 to correlators in Liouville CFT. In this talk, I will explain how this picture can be lifted to higher dimensional gauge theories via the correspondence of partition functions on S5, S4xS1, S3 and S2xS1 to correlators in theories whose underlying symmetry is given by a quantum deformation of the Virasoro algebra. In particular, I will discuss how 3-point functions can be derived by the bootstrap approach and used to define this novel class of q-deformed CFTs. I will also discuss some aspects related to integrable structures in these models, such as reflection coefficients, as well as possible generalisation.

29.10.2014 (Wednesday)

Exact Results in SUSY: Lecture 4

Informal Seminar Brian Wecht (QMUL)

at:
11:00 QMW
room G.O. Jones 610
abstract:

In this series of 4-5 2-hour lectures, I'll describe some of the powerful exact results that one can achieve in supersymmetric theories. The topics will be as follows: Lecture 1: Non-Renormalization Theorems Lecture 2: Classical and Quantum Moduli Spaces Lecture 3: Superconformal Field Theories and Seiberg Duality Lecture 4: Central Charges, a-maximization, and the a-theorem Lecture 5 (if it happens): Brane Tilings and Dimers