## 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)

### 25.11.2014 (Tuesday)

#### Massive Higher-Spin Gravities in 3d unfolded

Exceptional Seminar Dmitry Ponomarev (LMU (Munich))

 at: 13:15 KCLroom K.0.16 abstract: We classify the possible linear unfolded equations for propagating bosonic higher-spin tensor fields in AdS_3 backgrounds. Doing this we reproduce the existing topologically massive and new topologically massive (higher)-spin systems whose content we clarify. We find systems that generalise various critical gravities to higher-spins.

### 19.11.2014 (Wednesday)

#### Higher spins, entanglement and Wilson lines

Regular Seminar Juan Jottar (ETH (Zurich))

 at: 13:15 KCLroom G.01 abstract: We discuss entanglement and Renyi entropies in two-dimensional conformal field theories with extended symmetry algebras of W-type, in the semiclassical (large-c) limit. From the CFT perspective, the computation of these non-local observables involves the study of semiclassical conformal blocks in theories with additional conserved currents beyond the stress tensor. From an AdS perspective, the problem can be tackled using recent holographic proposals in terms of Wilson lines in the dual three-dimensional higher spin theories. We discuss non-trivial examples exhibiting the agreement between bulk and boundary computations.

### 12.11.2014 (Wednesday)

#### The quantum theory of fluids

Triangular Seminar Ben Gripaios (Cambridge Cavendish)

 at: 15:00 KCLroom SMinus2.23 abstract: I discuss the quantization of a perfect fluid. This differs from textbook QFT, because of the presence of vortex modes, which map to an infinite collection of quantum mechanical free particles rather than harmonic oscillators. As a result, there is no Fock space and no S-matrix. I argue that there exists, nevertheless, a consistent effective field theory description, valid at large distances and times.

### 12.11.2014 (Wednesday)

#### Galaxy Clusters as Tele-ALP-scopes

Triangular Seminar Joe Conlon (Oxford)

 at: 16:30 KCLroom SMinus2.23 abstract: Galaxy clusters are the most efficient convertors of axion-like particles to photons in the universe. I discuss the physics and phenomenology of ALPs, and describe their astrophysical implications, with particular reference to the recently observed 3.5 keV X-ray line that is a candidate for a dark matter decay line.

### 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.