## 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)

### 05.10.2016 (Wednesday)

#### An operator for the zeros of the Riemann zeta function

Regular Seminar Brody Dorje (Imperial College)

 at: 13:15 KCLroom G01 Norfolk Building abstract: The Riemann hypothesis asserts that the nontrivial zeros of the Riemann zeta function should be of the form 1/2 + i E_n, where the set of numbers {E_n} are real. The so-called Hilbert-PÃ³lya conjecture assumes that {E_n} should correspond to the eigenvalues of an operator that is Hermitian. The discovery of such an operator, if it exists, thus amounts to providing a proof of the Riemann hypothesis. In 1999 Berry and Keating conjectured that such an operator should correspond to a quantisation of the classical Hamiltonian H = xp. Since then, the Berry-Keating conjecture has been investigated intensely in the literature, but its validity has remained elusive up to now. In this talk I will derive a "Hamiltonian" (a differential operator), whose classical counterpart is H = xp, having the property that with a suitable boundary condition on its eigenstates, the eigenvalues {E_n} correspond to the nontrivial zeros of the Riemann zeta function. This Hamiltonian is not Hermitian, but is symmetric under space-time reflection (PT symmetric) in a special way. A formal argument will be given for the construction of the metric operator to define an inner-product space for the eigenstates, and the formally "Hermitian" counterpart Hamiltonian. The talk is based on the work carried out in collaboration with Carl M. Bender (Washington University) and Markus P. Mueller (University of Western Ontario).

### 07.09.2016 (Wednesday)

Exceptional Seminar Rodrigo Olea Aceituno (UNAB, Chile)

 at: 13:15 KCLroom S5.20 abstract: As an alternative to the Holographic Renormalization procedure in the context of AdS/CFT correspondence, we introduce a regularization scheme for AdS gravity based on the addition of boundary terms which are a given polynomial of the extrinsic and intrinsic curvatures (Kounterterms). These terms are closely related to either topological invariants or Chern-Simons densities in the corresponding dimension, they can be easily generalized to other gravity theories (Einstein-Gauss-Bonnet, Lovelock, etc.). We provide a general prescription on how to obtain standard holographic quantities at the boundary. We also briefly comment on a possible relation to supersymmetry.

### 29.08.2016 (Monday)

#### STiL 2016: Supersymmetry, Geometry, and Holography

Exceptional Seminar - - (-)

 at: 10:00 KCLroom tba abstract: 29 August - 3 September, King's College London. This workshop intends to bring together leading experts and young researchers working on the broad themes of quantum field theory, black holes and gravitation, and holography, so as to share new ideas, calculations, and results in a focused setting. The topics covered in the workshop include: Symmetries and dualities in field theory and gravity Classical and quantum aspects of black holes Supersymmetric localization and exact results Mathematical aspects of string theory Supergravity solutions and holography Website Registration will be closed on 8 July 2016 or when positions are filled.

### 28.04.2016 (Thursday)

#### Towards a theory of gravitational radiation

Exceptional Seminar Pawel Nurowski (Centre for Theoretical Physics, Polish Academy of Sciences, Warsaw, Poland)

 at: 16:00 KCLroom K2.3, Nash Lecture theatre abstract: The recent observation of gravitational waves by LIGO has revived interest in the work on the theory of gravitational radiation done at King's and elsewhere in the 1950's and early 60's. It is well known that after predicting gravitational waves in 1916 Einstein became uncertain about their physical reality. It wasn't until the 1950's and early 60's that their physical status was clarified. Important contributions to the development of the theory of gravitational radiation were made at this time by members of the King's relativity group such as Hermann Bondi, Felix Pirani and Roger Penrose. In 1958 Andrzej Trautman from Leopold Infeld's relativity group in Warsaw delivered a series of highly influential lectures on gravitational radiation at King's. In this talk the work of the Warsaw group, and Trautman in particular, will be discussed and its influence on the development of gravitational wave theory will be explained. Refreshments will be available after the lecture. Please RSVP to: D C Robinson david.c.robinson@kcl.ac.uk

### 30.03.2016 (Wednesday)

#### On Killing superalgebras and filtered deformations

Exceptional Seminar Andrea Santi (University of Edinburgh, Marie-Curie INdAM)

 at: 13:15 KCLroom K4.31 abstract: I will present ongoing work with J. Figueroa-O’Farrill and P. de Medeiros on the algebraic structure of Lie superalgebras $g = g_0 \oplus g_1$ generated by Killing spinors. I will explain how any $g$ can be regarded as an appropriate deformation of a subalgebra of the Poincaré superalgebra and discuss applications to the classification of supersymmetric supergravity backgrounds and the geometries admitting rigidly supersymmetric field theories.

### 23.03.2016 (Wednesday)

#### Opers and the E6 Minahan-Nemeschansky theory

Regular Seminar Lotte Hollands (Heriot-Watt U., Edinburgh)

 at: 13:15 KCLroom K4.31 abstract: In this seminar I explain a geometric proposal to determine a nonperturbative partition function for the E6 Minahan-Nemeschansky theory. Important ingredients are generating functions of opers, spectral networks and a generalisation of complex Fenchel-Nielsen coordinates to moduli spaces of higher rank flat connections. (This is joint work with Andy Neitzke.)

### 16.03.2016 (Wednesday)

#### Prethermalization and thermalization in models with weak integrability breaking

Regular Seminar Fabian Essler (Oxford U.)

 at: 13:15 KCLroom K4.31 abstract: I consider the the effect of weak integrability breaking interactions on the non-equilibrium time evolution in many-particle systems. Using a class of weakly interaction fermion models as an example, I argue that there exists a time window in which the system relaxes locally to a non-equilibrium meta-stable state, before it eventually thermalizes.

### 16.03.2016 (Wednesday)

Triangular Seminar George Papadopoulos (King's College London)

 at: 15:30 KCLroom WATERLOO G.73 abstract: Polygon Seminar. NOTE: Seminar is in the room G.73, Franklin-Wilkins, WATERLOO CAMPUS of King's College London. http://www.kcl.ac.uk/campuslife/campuses/waterloo/Waterloo.aspx

### 09.03.2016 (Wednesday)

#### AdS Moduli Spaces and Domain Walls

Regular Seminar Hagen Triendl (Imperial College)

 at: 13:15 KCLroom K4.31 abstract: I discuss general properties of supersymmetric Anti-de Sitter (AdS) backgrounds, in particular regarding their moduli spaces and domain walls. I argue that lower-dimensional gauged supergravity is a strong tool to understand supersymmetric AdS backgrounds, independent of the compactification manifold. I show how the moduli space can be determined and explain what this means for the dual conformal field theories. In the last part I comment on supersymmetric domain walls and their dual interpretation as supersymmetric RG- flows.

### 26.02.2016 (Friday)

#### S-matrix and conformal bootstrap

Regular Seminar Joao Penedones (EPFL)

 at: 14:00 KCLroom S2.29 abstract: We propose a new strategy to constraint (and perhaps determine) the mass spectrum and the scattering amplitudes of a Quantum Field Theory (QFT). We consider QFT in hyperbolic space and study correlation functions of operators inserted at the conformal boundary. By construction, these observables transform like correlation functions of a lower dimensional Conformal Field Theory. We then apply conformal bootstrap techniques to find universal bounds on the mass spectrum and scattering amplitudes of the QFT. For 1+1 dimensional QFT, we recover the same bounds from a direct S-matrix bootstrap approach.

### 24.02.2016 (Wednesday)

#### Higher Spin Black Holes

Regular Seminar Alejandra Castro (Amsterdam U.)

 at: 13:15 KCLroom K4.31 abstract: I'll overview recent progress on non-perturbative aspects of higher spin theories in three dimensions with emphasis on black holes. The two main results I will discuss are: 1) novel properties of extremal and BPS solutions, and 2) how to interpret a higher spin bh as a thermo-field state.

### 17.02.2016 (Wednesday)

#### Topological quantum field theory: symmetries and defects

Regular Seminar Nils Carqueville (Schroedinger Inst., Vienna)

 at: 13:15 KCLroom K4.31 abstract: A major paradigm of 20th-century science is to understand nature in the language of quantum field theory. Efforts to answer foundational questions about this language have led to successful and ongoing cross-fertilisation between theoretical physics and pure mathematics. In particular, Atiyah and Segal proposed an axiomisation of the path integral by beautifully linking geometry with algebra. The talk starts with a lightening review of this functorial approach, and then quickly restricts to the case in which spacetime is two-dimensional and has no geometric structure: two-dimensional topological quantum field theory (TQFT). This seemingly simple situation is still surprisingly rich, and we will see how algebras, categories, and "higher" structures appear naturally; examples of such structures are ubiquitous in theoretical physics, string theory, and many areas of mathematics. Once the stage is carefully set, we turn to the central notion of symmetry, which involves the action of groups on a TQFT. We will be led to interpret symmetries as special kinds of "defects" of the TQFT, which in turn allows for a natural, purely algebraic generalisation of orbifolding. This leads to new equivalences between TQFTs, of which we will discuss the examples of Landau-Ginzburg models, and (if time permits) refined knot invariants.

### 17.02.2016 (Wednesday)

#### Brane Brick Models, Toric Calabi-Yau 4-folds and 2d (0,2) Quivers

Exceptional Seminar Rak-Kyeong Seong (KIAS)

 at: 15:30 KCLroom K6.63 abstract: In this talk, I will discuss Type IIA brane configurations consisting of D4-branes suspended between NS5-branes which represent a large class of 2d (0,2) quiver gauge theories. We call these new constructions Brane Brick models. These are T-dual to D1-branes over singular toric Calabi-Yau 4-folds and encode information about the probed Calabi-Yau geometry as well as the corresponding GLSM. If time permits, I will present how Brane Brick models naturally realise in terms of a brane configuration 2d (0,2) Gadde-Gukov-Putrov triality.

### 10.02.2016 (Wednesday)

#### TBA

Regular Seminar Itamar Shamir (King's College)

 at: 13:15 KCLroom S-1.06 abstract:

### 20.01.2016 (Wednesday)

#### Gronewold-Moyal Mechanics: From quantum mechanics to higher spin gravity and matrix models

Regular Seminar Mauricio Valenzuela (Chile Austral U., Valdivia)

 at: 13:15 KCLroom S0.13 abstract: The goal of this talk is to show some uses of the Gronewold-Moyal product in physics and new applications. In the first part of this talk we review the approach of Gronewold and Moyal in the quantization of classical systems. Then we remark algebraic aspects related to the representation of symplectic algebras and extensions of Anti-de-Sitter algebras. Subsequently we describe how these aspects are used in higher spin gravity. In the second part of this talk we present some new advances. We quantize a particular class of algebraic varieties, involving multivectors, and which contains Minkowski space slices. We show that these non-commutative geometries are solutions of known matrix models and some simple extensions of them. Then we present new models which describe the dynamics of extended objects in close resemblance to the equations of Hamiltonian systems. We also introduce statistical distributions in these spaces which encode their coordinates spectra.

### 09.12.2015 (Wednesday)

#### Gluing hexagons into three point functions

Regular Seminar Benjamin Basso (ENS, Paris)

 at: 13:15 KCLroom S0.13 abstract: I will present a framework for computing correlators of three single trace operators in planar N=4 SYM theory that uses hexagonal patches as building blocks. This approach allows one to exploit the integrability of the theory and derive all loop predictions for its structure constants. After presenting the main ideas and results, I will discuss recent perturbative tests and open problems.

### 07.12.2015 (Monday)

#### Exact Path Integral for 3D Quantum Gravity

Exceptional Seminar Akinori Tanaka (RIKEN, Wako, JAPAN)

 at: 13:15 KCLroom Norfork G.01 abstract: In 2007, it was conjectured by E.Witten that the chiral part of the partition function of 3d pure AdS Einstein gravity in quantum regime coincides with so-called modular J-function, a partition function of certain holomorphic CFT, called "monster CFT" considered by I. B Frenkel, J. Lepowsky and A. Meurman in the context of monstrous moonshine. We tried to calculate the partition function for the 3d pure AdS Einstein gravity directly by utilizing recently developed localization techniques.Based on some plausible assumptions, we arrived at CFT interpretations.For quantum gravity regime which corresponds to c=24, we get J-function.For semiclassical regime which corresponds c>>1, our partition function decomposes to Virasoro characters, and we derive Cardy formula. If possible, I will comment on application to quantum higher spin gravity.This talk is based on 1504.05991 and 1510.02142.

### 02.12.2015 (Wednesday)

#### Anomalies RG-Flows and the a-Theorem in Six-Dimensions

Triangular Seminar Clay Cordova (IAS)

 at: 15:00 KCLroom K6.29 Anatomy Theater abstract: I will describe recent progress in computing Weyl anomalies in strongly-coupled six-dimensional field theories. Along the way we will prove an a-theorem quantifying the loss of degrees of freedom along renormalization group flows.

### 25.11.2015 (Wednesday)

#### Black hole microstates in AdS from gauge theory

Regular Seminar Francesco Benini (Imperial College)

 at: 13:15 KCLroom S0.13 abstract: One of the great successes of string theory, as a theory of quantum gravity, is the explanation of the entropy of asymptotically-flat black holes. I will present, instead, a counting of the microstates of certain black holes in AdS4. The black holes have an holographic description as RG flows from a 3D CFT to superconformal quantum mechanics, and the counting of microstates proceeds via supersymmetric localization. Along the way, we will define and compute an index for topologically twisted theories, and propose an extremization principle to determine the superconformal R-symmetry in quantum mechanics.

### 24.11.2015 (Tuesday)

#### Energy Gaps and Casimir Energies in Holographic CFTs

Regular Seminar Andrew Hickling (Imperial College)

 at: 14:15 KCLroom S4.23 abstract: Two interesting properties of static curved space QFTs are Casimir Energies, and the Energy Gaps of fluctuations. We investigate what AdS/CFT has to say about these properties by examining holographic CFTs defined on curved but static spatially closed spacetimes. Being holographic, these CFTs have a dual gravitational description under Gauge/Gravity duality, and these properties of the CFT are reflected in the geometry of the dual bulk. We can turn this on its head and ask, what does the existence of the gravitational bulk dual imply about these properties of the CFTs? In this talk we will consider holographic CFTs where the dual vacuum state is described by pure Einstein gravity with negative cosmological constant. We will argue using the bulk geometry first, that if the CFT spacetime's spatial scalar curvature is positive there is a lower bound on the gap for scalar fluctuations, controlled by the minimum value of the boundary Ricci scalar. In fact, we will show that it is precisely the same bound as is satisfied by free scalar CFTs, suggesting that this bound might be something that applies more generally than just in a Holographic context. We will then show, in the case of 2+1 dimensional CFTs, that the Casimir energy is non-positive, and is in fact negative unless the CFT's scalar curvature is constant. In this case, there is no restriction on the boundary scalar curvature, and we can even allow singularities in the bulk, so long as they are 'good' singularities. If time permits, we will also describe some new results about the Hawking-Page transition in this context.