## Directions

This institute may be found at Strand in Central London, just north of the Thames (map).

Getting to the Strand Campus:

• #### By underground

Temple (District and Circle lines): 2 minute walk. Charing Cross (Bakerloo and Northern lines): 10 minute walk, Embankment (District, Circle and Bakerloo lines): 10 minute walk, Waterloo (Jubilee, Northern, Bakerloo, Waterloo & City lines): 12 minute walk, Holborn (Central and Picadilly lines): 12 minute walk,Chancery Lane (Central line): use exit 4 - 15 minute walk.

• #### By train

Charing Cross: 9 minute walk. Waterloo: 12 minute walk. Waterloo East: 10 minute walk. Blackfriars: 12 minute walk.

• #### By bus

Buses stopping outside the College: 1, 4, 26, 59, 68, 76, X68, 168, 171, 172, 176(24 hour), 188, 243 (24 hour), 341 (24 hour), 521, RV1.

## Seminars at King's College London

Found at least 20 result(s)

### 05.11.2014 (Wednesday)

#### F-theory on singular spaces

Regular Seminar Andres Collinucci (ULB, Brussels)

 at: 13:15 KCLroom G.01 abstract: F-theory paints a beautiful picture that relates gauge theories to purely geometric information, whereby the Dynkin diagrams of gauge groups come to life as 2-cycles of internal spaces. The caveat is that, such spaces are necessarily singular, and treating them sensibly requires resolving or deforming the singularities. Recently, my collaborator R. Savelli and I have proposed a new strategy that allows one to deal with singular spaces directly. It is based on Eisenbud’s so-called matrix factorisations. This remarkably simple concept has very deep connections to the mathematics of singularities. In this talk, I will review the basic notions needed to formulate the issues, assuming only standard knowledge of string theory. Then, after introducing our proposal, I will show examples of its applications, such as computations of chiral spectra for bound states of 7-branes.

### 29.10.2014 (Wednesday)

#### Yangian symmetry of smooth super-Wilson loops in planar N=4 super-Yang-Mills

Regular Seminar Cristian Vergu (King's College)

 at: 13:15 KCLroom G.01 abstract: Light-like polygonal super-Wilson loops are dual to scattering amplitudes in planar N=4 super-Yang-Mills and enjoy an infinite-dimensional Yangian symmetry which extends the superconformal symmetry.  However, this symmetry is anomalous.  In this talk we will describe a super-Wilson loop on a smooth contour, which is free of UV divergences and on which the superconformal symmetry operators are not anomalous.  We also study the action of level one Yangian generators on the one-loop expectation value of this super-Wilson loop. [This is work in progress with N.Beisert, D.Muller and J.Plefka]

### 22.10.2014 (Wednesday)

#### Permutation orbifolds and holography

Regular Seminar Mukund Rangamani (Durham )

 at: 13:15 KCLroom G.01 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 gravity dual. I will describe attempts to construct a large class of CFTs satisfying these conditions exploiting some technology of permutation orbifolds. Time permitting I will also outline some tests for the sufficiency of these conditions.

### 21.10.2014 (Tuesday)

#### Aspects of Higher Spin Symmetries in Various Dimensions

Exceptional Seminar Karan Govil (Pennsylvania State Universiy)

 at: 16:00 KCLroom S 5.20 abstract: The algebras of higher spin symmetries in conformal field theories in four and six dimensions are not unique and have a richer structure due to the existence of infinite short multiplets besides the usual scalar and spinor. We will focus on recent results that show there exists a one parameter family (continuous of d=4 and discrete for d=6) of higher spin algebras and superalgebras, and give an explicit unitary representation for these algebras using quasiconformal methods. We will also discuss the implications of these results for the AdS5/CFT4 and AdS7/CFT6 higher spin holography.

### 15.10.2014 (Wednesday)

#### Coulomb branch and the moduli space of instantons

Regular Seminar Stefano Cremonesi (King's College)

 at: 13:15 KCLroom G.01 abstract: I will explain how to compute the Hilbert series that counts chiral operators parametrising the Coulomb branch of the moduli space of vacua of three-dimensional N=4 supersymmetric gauge theories. The formula has applications to Physics, such as to the study of infrared dualities in three dimensions and of string backgrounds with eight supercharges, as well as to Mathematics, where it provides a new way to characterise HyperKaehler cones as algebraic varieties.  I will then show how the Coulomb branch of certain 3d N=4 generalised quiver gauge theories can be used to compute the Hilbert series of the moduli space of k G-instantons, for any simple Lie group G. The construction is alternative to the ADHM construction that is only available for classical groups G.

### 29.09.2014 (Monday)

#### Scattering Amplitudes as a Flux Tube Gas

Exceptional Seminar Pedro Vieira (Perimeter Institute)

 at: 14:15 KCLroom S2.28 abstract: TBA

### 03.06.2014 (Tuesday)

#### MOST -- Mathematics of String Theory

Exceptional Seminar Mathematics of String Theory Workshop Bridgeland Dimofte Fine Gross dela Ossa Keel Hollands Skinner Thomas (See Abstract for Details)

 at: 9:00 KCLroom K2.31 abstract: Workshop information and registration http://www.mth.kcl.ac.uk/~ss299/MOST/

### 02.06.2014 (Monday)

#### MOST -- Mathematics of String Theory

 at: 9:00 KCLroom K6.29 abstract: Workshop homepage for information and registration http://www.mth.kcl.ac.uk/~ss299/MOST/

### 28.05.2014 (Wednesday)

#### Higher Spins in Hyperspace

Exceptional Seminar Dmitri Sorokin (INFN Padova)

 at: 13:15 KCLroom K -1.56 abstract: I will discuss basic features of a formulation of higher-spin field theory in which conventional space-time gets extended to a hyperspace with a number of extra dimensions that effectively describe the spin degrees of freedom of the fields in the ordinary space-time. In this formulation an infinite number of higher spin fields are packed into a single scalar and spinor field propagating in the hyperspace. The dynamics of higher spin fields is encoded in equations of motion of the scalar and spinor hyperfields. The hyperfield equatons on flat and AdS-like hyperspaces are related to each other by a generalized conformal transformation, which also relates two-, three- and four-point functions in the AdS-like hyperspace to the corresponding correlators in the flat hyperspace.

### 21.05.2014 (Wednesday)

#### Localisation and gauge/gravity duality

Exceptional Seminar Cremonesi Drukker Shamir Sparks (-)

 at: 10:00 KCLroom K2.31 abstract: This is a one-day meeting on localisation and gauge gravity duality. More information at http://kings-meeting.wikidot.com/

### 15.05.2014 (Thursday)

#### South East Mathematical Physics Seminar

Exceptional Seminar South East Mathematical Physics Seminar (See Abstract for Details)

 at: 11:00 KCLroom K2.31 abstract: South East Mathematical Physics Seminar: For details see http://www.mth.kcl.ac.uk/SEMPS/ Speakers: Leron Borsten,Paul Sutcliffe, Vidas Regelskis, Abera Muhamed, Craig Lawrie

### 14.05.2014 (Wednesday)

#### Student Triangle Seminar

Triangular Seminar Student Triangle Seminar (See Abstract for Details)

 at: 15:30 KCLroom S-2.08 abstract: Student Triangle Seminar! http://www.mth.kcl.ac.uk/studenttriangle.html

### 07.05.2014 (Wednesday)

#### The fermionic basis in sin(h)-Gordon model

Informal Seminar Stefano Negro (Durham and Turin)

 at: 13:15 KCLroom K -1.56 abstract: Recently a powerful approach to the computation of one-point functions in the quantum XXZ spin 1/2 chain has been proposed by Boos, Jimbo, Miwa and Smirnov; this framework relies on the existence of a particular basis in the state space of the theory: the fermionic basis. I will present the construction of these fermions for the scaling limit of inhomogeneous XXZ spin 1/2 chain, the sine-Gordon model, and for its twin, the sinh-Gordon model. If time allows it, I will briefly present a possible interpretation of the fermionic basis and one-point functions in terms of the action of a modified version of the sinh-Gordon model.

### 26.03.2014 (Wednesday)

#### Exact tachyon spectrum in AdS/CFT

Regular Seminar Ryo Suzuki (Oxford)

 at: 13:15 KCLroom S-1.04 abstract: Unstable string states in curved spacetime is not well-understood compared to those in the flat spacetime. We consider potentially tachyonic open string states in AdS_5xS^5 which should correspond to a determinant-like operator in N=4 super Yang-Mills by the AdS/CFT correspondence. Its conformal dimension is studied using integrability and perturbative methods in N=4 SYM. By proposing and solving the boundary thermodynamic Bethe ansatz (BTBA) equations, we find an indication that states of N=4 SYM turn into tachyonic at finite coupling where the total energy of the corresponding string becomes zero.

### 19.03.2014 (Wednesday)

#### Localisation on three-manifolds

Regular Seminar Paul Richmond (Oxford)

 at: 13:15 KCLroom S-1.04 abstract: In this talk I will discuss the localisation of supersymmetric gauge theories on Riemannian three-manifolds with the topology of a three-sphere. The three-manifold is always equipped with an almost contact structure and an associated Reeb vector field. The partition function depends only on this vector field and has an explicit expression in terms of the double sine function. In addition, I will discuss the possibility of generalising this work to five dimensions.

### 05.03.2014 (Wednesday)

#### Entanglement in higher spin theories

Regular Seminar Eric Perlmutter (DAMTP Cambridge)

 at: 13:15 KCLroom S -1.04 abstract: There has been phenomenal recent progress in computing CFT entanglement and Renyi entropies, holographically and otherwise. We extend these investigations to the higher spin regime -- where sensible notions of geometry are sorely lacking -- by computing ground state Renyi entropies in certain classes of holographic CFTs with higher spin symmetry. Our calculations are performed at both classical and one-loop level, from gravity and CFT. Along the way, we establish some new general results about Renyi entropy in any CFT, higher spin symmetry aside.

### 26.02.2014 (Wednesday)

#### Wick rotation and the positivity of energy in quantum field theory

Regular Seminar Graeme Segal (Oxford)

 at: 13:15 KCLroom S -1.04 abstract: The positivity of energy in quantum field theory is traditionally but not altogether clearly encoded in the possibility of ‘Wick rotation’ – the analytic continuation of various observable quantities to ‘imaginary time’. My talk, an account of joint work with Maxim Kontsevich, will describe a somewhat different point of view on this. I shall motivate the definition of a specific infinite-dimensional domain of complex-valued metrics on a smooth manifold which is a complexification of the usual space of real Riemannian metrics, but has the Lorentzian metrics on its boundary. The positivity of energy is then encoded in the fact that the theory is the boundary value of a holomorphic theory defined for space-time manifolds with complex metrics belonging to the domain. Questions of the unitarity of field theory in a curved space-time are thereby related to familiar phenomena in representation theory.

### 19.02.2014 (Wednesday)

#### Seminar Cancelled

Regular Seminar Fedor Smirnov (LPTHE Paris)

 at: 13:15 KCLroom S -1.04 abstract: Using the fermionic basis we conjecture explicit formulae for the one-point functions in the sinh-Gordon model on a cylinder at finite temperature). The conjecture is checked against known results.

### 05.02.2014 (Wednesday)

#### Exceptional geometry, gauged supergravity and the tensor hierarchy

Regular Seminar Mariana Grana (IPhT Saclay)

 at: 13:15 KCLroom S -1.04 abstract: Exceptional generalised geometry (or exceptional field theory) is an extension of generalised complex geometry (or double field theory) "geometrising" all degrees of freedom of 11d or type II supergravity. Concentrating on the case in which the 11d tangent space is split into four and seven dimensional spaces, we will discuss the geometry and gauge structure of these exceptional theories. We will show how closure of the "exceptional Lie algebra" requires adding a tower of four-dimensional p-form fields, known in the 4d gauged supergravity language as the tensor hierarchy. This indicates the existence of an underlying structure compatible with the E_{11} construction.

### 29.01.2014 (Wednesday)

#### Integrabilty and STU supergravity

Regular Seminar Axel Kleinschmidt (AEI Potsdam)

 at: 13:15 KCLroom S -1.04 abstract: I will review the known integrable structures of (super-)gravity in the presence of a sufficient number of Killing vectors and how they can be used to generate new solutions. The associated inverse scattering techniques have been widely applied to four-dimensional Einstein gravity, starting with the work of Belinski and Zakharov, but their generalisation to other gravity systems poses some problems. I will discuss progress for the case of STU supergravity by exploiting the underlying group theory.