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)

14.11.2017 (Tuesday)

Aspects of eta and lambda models and generalised T-duality

Regular Seminar Daniel Thompson (Swansea U.)

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

In this talk I shall give a review of two classes of integrable non-linear sigma models called \eta and \lambda deformations. Three reasons to be interested are 1) these are interesting examples of relatively rare integrable QFT displaying quantum group symmetries; 2) viewed as string theory sigma models they may have application to N=4 SYM via holography and 3) they provide concrete examples for generalised notions of T-duality. This talk will describe a variety of classical and quantum properties of these theories and their multi-parameter extensions drawing in part on arXiv:1711.00084; arXiv:1706.05322

09.11.2017 (Thursday)

Integrable lattice models in the UV

Regular Seminar Luigi Tizzano (Uppsala U.)

at:
14:00 QMW
room GO Jones 610
abstract:

Integrable lattice models in 1+1 dimensions have been a topic of much fascination in physics since the early days of quantum mechanics. Recently, a work by Costello has offered a new perspective on these models based on a 4D topological gauge theory. An interesting aspect of this proposal is the close connection with 3D Chern-Simons theory and knot invariants. I will explain how to derive the 4D topological theory using string dualities and localization techniques for a 5D twisted super Yang-Mills theory. Finally, I will explain how this construction might relate to other appearances of Yangian symmetry which played a prominent role in AdS/CFT physics. This is a joint work in progress with Joe Minahan.

19.10.2017 (Thursday)

AdS3/CFT_2 and F-Theory

Regular Seminar Christopher Couzens (King's Coll. London)

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

In this talk we consider holographic duals of F-theory solutions to 2d SCFT's. We approach the problem by classifying a particular class of solutions of type IIB supergravity with AdS_3 factors and varying axio-dilaton. The class of solutions we discuss consist of D3 and 7-brane configurations and naturally fall into the realm of F-theory. We prove that for (0,4) supersymmetry in 2d the solutions are essentially unique and we match the holographic central charges to field theory results. We comment on future directions, including AdS_3 solutions of F-theory, preserving different amounts of supersymmetry.

05.10.2017 (Thursday)

On self-dual N=4 theories

Regular Seminar Inaki Garcia Etxebarria (MPI Munich)

at:
2:00 QMW
room G.O. Jones 610
abstract:

05.07.2017 (Wednesday)

Holography of BCFT

Regular Seminar Chong-Sun Chu (NCTS, Hsinchu and Taiwan, Natl. Tsing Hua U.)

at:
11:30 QMW
room 610
abstract:

In this talk, I will discuss about the holography of boundary Conformal Field theory. I will show how boundary Weyl Anomaly can be obtained from holography. New universal relations between the shape dependence of Casimir effects and boundary Weyl anomaly will also be pointed out and discussed from the point of view of holography.

29.06.2017 (Thursday)

Irreversibility of the renormalization group flow in non-unitary quantum field theory

Regular Seminar Benjamin Doyon (KCL)

at:
14:00 QMW
room GO Jones 610
abstract:

The talk is based on a very recent work of the speaker on generalising Zamolodchikov's c-theorem to non-unitary theories.

14.06.2017 (Wednesday)

Scattering Amplitudes, Double Copy and Worldsheet Models of QFTs (Lecture 4)

Informal Seminar Ricardo Monteiro (QMUL)

at:
10:30 QMW
room GO Jones 610
abstract:

I will give an introduction to current topics in the study of scattering amplitudes of gauge theory and gravity. There will be four two-hour lectures, and the plan is as follows. Lecture 1 will review basic modern techniques for scattering amplitudes, including recursion relations. Lecture 2 will present an overview of the relations describing gravity as a double copy of gauge theory, both for scattering amplitudes and for solutions to the equations of motion. Lecture 3 will introduce the formalism of the scattering equations, leading to the CHY formulas for amplitudes in theories of massless particles. Lecture 4 will present new developments in computing field-theory amplitudes from string-theory-inspired techniques, via a new type of worldsheet model known as ambitwistor string. This leads to an extension of the scattering equations to loop level.

13.06.2017 (Tuesday)

Scattering Amplitudes, Double Copy and Worldsheet Models of QFTs (Lecture 3)

Informal Seminar Ricardo Monteiro (QMUL)

at:
10:30 QMW
room GO Jones 610
abstract:

I will give an introduction to current topics in the study of scattering amplitudes of gauge theory and gravity. There will be four two-hour lectures, and the plan is as follows. Lecture 1 will review basic modern techniques for scattering amplitudes, including recursion relations. Lecture 2 will present an overview of the relations describing gravity as a double copy of gauge theory, both for scattering amplitudes and for solutions to the equations of motion. Lecture 3 will introduce the formalism of the scattering equations, leading to the CHY formulas for amplitudes in theories of massless particles. Lecture 4 will present new developments in computing field-theory amplitudes from string-theory-inspired techniques, via a new type of worldsheet model known as ambitwistor string. This leads to an extension of the scattering equations to loop level.

07.06.2017 (Wednesday)

Scattering Amplitudes, Double Copy and Worldsheet Models of QFTs (Lecture 2)

Informal Seminar Ricardo Monteiro (QMUL)

at:
10:00 QMW
room GO Jones 610
abstract:

I will give an introduction to current topics in the study of scattering amplitudes of gauge theory and gravity. There will be four two-hour lectures, and the plan is as follows. Lecture 1 will review basic modern techniques for scattering amplitudes, including recursion relations. Lecture 2 will present an overview of the relations describing gravity as a double copy of gauge theory, both for scattering amplitudes and for solutions to the equations of motion. Lecture 3 will introduce the formalism of the scattering equations, leading to the CHY formulas for amplitudes in theories of massless particles. Lecture 4 will present new developments in computing field-theory amplitudes from string-theory-inspired techniques, via a new type of worldsheet model known as ambitwistor string. This leads to an extension of the scattering equations to loop level.

06.06.2017 (Tuesday)

Scattering Amplitudes, Double Copy and Worldsheet Models of QFTs (Lecture 1)

Informal Seminar Ricardo Monteiro (QMUL)

at:
10:00 QMW
room GO Jones 610
abstract:

I will give an introduction to current topics in the study of scattering amplitudes of gauge theory and gravity. There will be four two-hour lectures, and the plan is as follows: Lecture 1 will review basic modern techniques for scattering amplitudes, including recursion relations. Lecture 2 will present an overview of the relations describing gravity as a double copy of gauge theory, both for scattering amplitudes and for solutions to the equations of motion. Lecture 3 will introduce the formalism of the scattering equations, leading to the CHY formulas for amplitudes in theories of massless particles. Lecture 4 will present new developments in computing field-theory amplitudes from string-theory-inspired techniques, via a new type of worldsheet model known as ambitwistor string. This leads to an extension of the scattering equations to loop level.

05.05.2017 (Friday)

The tale of two dilatons

Exceptional Seminar Paolo Di Vecchia (NBI/Nordita)

at:
12:00 QMW
room GO Jones LG7
abstract:

In this talk we will discuss how gauge invariance fixes the soft behavior of massless particles as photons, gluons, gravitons, dilatons and Kalb-Ramond field. We will then check these results in string theory and we will show that the subsubleading behavior for gravitons includes string corrections in the bosonic and heterotic strings, but not in superstring. They are consequence of the fact that the three-graviton amplitude has string corrections with respect to the field theoretical one. It turns out, instead, that the soft behavior of the dilaton has no string corrections and, in particular, involves the generators of dilatations and special conformal transformations. We then study the soft behavior of the Goldstone boson, called in the literature also dilaton, that one gets when one breaks spontaneously the conformal symmetry and we show that its soft behavior is very similar, but not identical, to that of the string dilaton.

20.04.2017 (Thursday)

2D CFT correlators for theories of class S_k

Regular Seminar Elli Pomoni (DESY)

at:
14:00 QMW
room 610
abstract:

We will introduce a large class of N=1 superconformal theories Sk which is obtained from Gaiotto’s N=2 class S via orbifolding. We will study the Coulomb branch of the theories in the class by constructing and analyzing their spectral curves. Using our experience from the N=2 AGT correspondence we will search for a 2D/4D relations (AGTk) for the N=1 theories of class Sk. From the curves we will identify the 2D CFT symmetry algebra and its representations, namely the conformal blocks of the Virasoro/W-algebra, that underlie the 2D theory and reproduce the Seiberg-Witten curves of the N = 1 gauge theories. We find that the blocks corresponding to the SU(N) Sk gauge theories involve fields in certain non-unitary representations of the WkN algebra. These conformal blocks give a prediction for the instanton partition functions of the 4D N = 1 SCFTs of class Sk.

30.03.2017 (Thursday)

What is Dark Matter?

Regular Seminar Tommi Tenkanen (QMUL)

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

The nature of the unknown non-baryonic energy density component whose abundance is known to exceed the amount of ordinary, visible matter by a factor of five, that of Dark Matter (DM), is one of the greatest open problems in cosmology. In this talk I will briefly review the evidence and searches for DM, present an overview of candidates including the standard WIMP paradigm, and discuss some recently proposed alternatives for WIMPs and how to test them.

16.03.2017 (Thursday)

Symmetry and String theory

Regular Seminar Menika Sharma (Harish-Chandra)

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

String theory in the tensionless limit is expected to have a large gauge symmetry. By recasting string theory on the AdS background as a generalization of Vasiliev's theory of massless higher-spin fields, it has become possible to understand the nature of this symmetry. In this talk, I will first give an overview of three-dimensional Vasiliev theory and its dual CFT. I will then discuss the current understanding of the symmetry algebra of string theory as well as some open problems related to it.

02.03.2017 (Thursday)

Quantum Geometry and Non-Geometric Backgrounds

Regular Seminar Richard Szabo (Heriot Watt)

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

Recent advances in non-geometric string theory suggest that locally non-geometric flux compactifications can be understood in terms of nonassociative deformations of spacetime geometry. We will review some of these developments and how they shed light on properties of non-geometric strings, and explain some new results concerning how these structures lift to non-geometric M-theory

01.03.2017 (Wednesday)

Modular properties of String Scattering Amplitudes

Triangular Seminar Michael Green (DAMTP/QMUL)

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

This talk will focus on some recent results concerning the low energy expansion of superstring scattering amplitudes. Whereas tree-level amplitudes generate a series of multiple zeta values (MZV) the genus-one amplitudes generate a series of elliptic generalisations (“modular graph functions”) that satisfy fascinating polynomial relations analogous to those satisfied by MZV’s. The latter part of the talk will briefly review how these features fit in with the non-perturbative structure of superstring amplitudes, studied some time ago.

01.03.2017 (Wednesday)

Yangian Symmetry and Integrability of Planar N=4 SYM

Triangular Seminar Niklas Beisert (ETH Zurich)

at:
16:30 QMW
room G.O. Jones Lecture Theatre
abstract:

This talk is about integrability of Planar N=4 super Yang-Mills theory. We present a concrete notion of the corresponding Yangian symmetry in this model, show that it holds true, and discuss the (perturbative) implications for correlation functions and Wilson loops.

16.02.2017 (Thursday)

TBA

Regular Seminar Dhritiman Nandan (Humboldt)

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

09.02.2017 (Thursday)

Generalized type II supergravity from kappa symmetry

Regular Seminar Linus Wulff (Imperial)

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

It has been known since the 80's that the Green-Schwarz superstring possesses the fermionic kappa symmetry, required for the consistency of the formulation, if the target space is a solution of the supergravity equations of motion. However, contrary to the standard lore and previous claims in the literature, it was recently shown that the converse is not true. Kappa symmetry of the Green-Schwarz superstring implies only a weaker set of equations for the target space fields, which we refer to as generalized supergravity equations. I will describe these equations for the type II case and contrast them with the standard type II supergravity equations which arise as a special case.

02.02.2017 (Thursday)

Particle formation and ordering in strongly correlated systems: a 1+1D model of QCD

Regular Seminar Gabor Takacs (Budapest U.)

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

I present the results of a study of a (1 +1 )-dimensional version of the famous Nambu-Jona-Lasinio model of quantum chromodynamics both at zero and at finite baryon density. For zero chemical potential, we found the formation of fermionic (nucleons and Δ baryons) and bosonic (two-quark mesons, six-quark deuterons) excitations, and demonstrated the existence of a phase transition. For a finite baryon density the model has a rich phase diagram which includes phases with a density wave and superfluid quasi-long-range (QLR) order, as well as a phase of a baryon Tomonaga-Luttinger liquid (strange metal). Relevant publication: P. Azaria, R.M. Konik, Ph. Lecheminant, T. Pálmai, G. Takács and A.M. Tsvelik: Particle Formation and Ordering in Strongly Correlated Fermionic Systems: Solving a Model of Quantum Chromodynamics, Phys. Rev. D94 (2016) 045003, arXiv:1601.02979 [hep-th].