## Directions

We are located on the Main Campus of City in Northampton Square (map)

Getting to the Strand Campus:

• #### By underground

Thea nearest tube stops are Farringdon, Angel, also nearby is Barbican

• #### By train

Farringdon (10 minutes walk) or King's Cross stations (20 minutes walk) have nearest main-line services

• #### By bus

Buses stopping outside the College: : 4, 19, 30, 38, 43, 55, 56, 63, 73, 153, 205, 214, 243, 274, 341, 394, 476.

## Seminars at City, University of London

Found at least 20 result(s)

### 03.04.2018 (Tuesday)

#### tba

Regular Seminar Luca Tagliacozzo (Strathclyde)

 at: 15:00 City U.room C320 abstract:

### 27.03.2018 (Tuesday)

#### CANCELLED

 at: 15:00 City U.room C320 abstract:

### 20.03.2018 (Tuesday)

#### tba

Regular Seminar Nuno Freitas (Warwick and KCL)

 at: 15:00 City U.room C320 abstract:

### 13.03.2018 (Tuesday)

#### tba

Regular Seminar Attila Csikasz-Nagy (KCL)

 at: 15:00 City U.room B103 abstract:

### 27.02.2018 (Tuesday)

#### Topological strings and 6d SCFTs

Regular Seminar Amir-Kian Kashani-Poor (ENS)

 at: 15:00 City U.room B103 abstract: The topological string is a simplified version of physical string theory. It is of interest because it computes the BPS spectrum of relevant string theory compactifications, but also because it shares structural properties of physical string theory, Dualities and symmetries which often must be argued for arduously in the physical string can often be verified by computation in the topological setting. The central observable of the theory is the topological string partition function Z_top. This quantity has an eerie habit of making surprise appearances in many areas of mathematical physics. Numerous techniques exist for its computation in various expansions in parameters of the theory, yet to date, no satisfactory closed form for this quantity is known. In this talk, after reviewing notions of topological string theory with an emphasis on the interplay between worldsheet and target space physics (one of the structural similarities between the physical and the topological string alluded to above), I will report on progress in computing Z_top in settings where it is related to enigmatic 6d theories.

### 20.02.2018 (Tuesday)

#### A review of Double and Exceptional Field Theory

Regular Seminar David Berman (QMUL)

 at: 15:00 City U.room C312 abstract: Recently a new formulation for supergravity has emerged inspired by the presence of duality symmetries in reduced theories. These new theories generalise ideas of Riemannian geometry and lead to new ways of looking at string and M-theory.

### 13.02.2018 (Tuesday)

#### Emergent hydrodynamics in integrable systems out of equilibrium

Regular Seminar Benjamin Doyon (King's)

 at: 15:00 City U.room B103 abstract: The hydrodynamic approximation is an extremely powerful tool to describe the behavior of many-body systems such as gases. At the Euler scale (that is, when variations of densities and currents occur only on large space-time scales), the approximation is based on the idea of local thermodynamic equilibrium: locally, within fluid cells, the system is in a Galilean or relativistic boost of a Gibbs equilibrium state. This is expected to arise in conventional gases thanks to ergodicity and Gibbs thermalization, which in the quantum case is embodied by the eigenstate thermalization hypothesis. However, integrable systems are well known not to thermalize in the standard fashion. The presence of infinitely-many conservation laws preclude Gibbs thermalization, and instead generalized Gibbs ensembles emerge. In this talk I will introduce the associated theory of generalized hydrodynamics (GHD), which applies the hydrodynamic ideas to systems with infinitely-many conservation laws. It describes the dynamics from inhomogeneous states and in inhomogeneous force fields, and is valid both for quantum systems such as experimentally realized one-dimensional interacting Bose gases and quantum Heisenberg chains, and classical ones such as soliton gases and classical field theory. I will give an overview of what GHD is, how its main equations are derived and its relation to quantum and classical integrable systems. If time permits I will touch on the geometry that lies at its core, how it reproduces the effects seen in the famous quantum Newton cradle experiment, and how it leads to exact results in transport problems such as Drude weights and non-equilibrium currents. This is based on various collaborations with Alvise Bastianello, Olalla Castro Alvaredo, Jean-Sébastien Caux, Jérôme Dubail, Robert Konik, Herbert Spohn, Gerard Watts and my student Takato Yoshimura, and strongly inspired by previous collaborations with Denis Bernard, M. Joe Bhaseen, Andrew Lucas and Koenraad Schalm.

### 07.02.2018 (Wednesday)

#### Triangle Seminar: Exploring EPR=ER with LLM

Triangular Seminar Joan Simon (Edinburgh)

 at: 16:00 City U.room A130 abstract: The extremal limit of single R-charged AdS5 black holes in type IIB is known to be described by a system of N free fermions in a one dimensional harmonic oscillator potential. Since the quantum mechanical problem is solvable and its phase space formulation appears in the gravity dual (LLM geometries), it allows us to explore the relation between entanglement, quantum correlation design and connectivity in space in this set-up, both in a single and a two boundary situation.

### 07.02.2018 (Wednesday)

#### Scattering Amplitudes -- Wilson Loops Duality for the first non-planar correction

Triangular Seminar Amit Sever (CERN)

 at: 17:30 City U.room A130 abstract: We study non-planar corrections to gluon scattering amplitudes in N = 4 SYM theory. In this talk, we focus on the first correction. It is computed by the double trace amplitude and is suppressed by one power of 1/Nc with respect to the leading single trace contribution. We extend the duality between planar scattering amplitudes and null polygonal Wilson loops to the double trace amplitude. The new duality allows us to extend the notion of loop integrand beyond the planar limit and to determine it using recursion relation. It also allows us to apply the integrability pentagon approach to the first non-planar order. We shortly discuss higher orders in the 't Hooft 1/Nc expansion.

### 06.02.2018 (Tuesday)

#### AdS3 holographic correlators with heavy states

Regular Seminar Rodolfo Russo (QMUL)

 at: 15:00 City U.room A225 abstract: The AdS/CFT duality maps supersymmetric heavy operators with conformal dimension of the order of the central charge to asymptotically AdS supergravity solutions. I'll show how by studying the quadratic fluctuations around such backgrounds it is possible to derive the 4-point correlators of two light and two heavy states in the supergravity approximation. I'll present some explicit examples in the AdS3 setup relevant for the duality with the D1-D5 CFT and discuss what we can learn in general about correlators among heavy pure states.

### 30.01.2018 (Tuesday)

#### tba

Regular Seminar Istvan Szecsenyi (City)

 at: 15:00 City U.room B103 abstract:

### 21.11.2017 (Tuesday)

#### Breaking integrability at the boundary

Regular Seminar Patrick Dorey (Durham)

 at: 15:00 City U.room C310 abstract: This talk will describe some work on the bouncing of particle-like (“kink”) solutions to a nonlinear wave equation, called the sine-Gordon equation, against a fixed boundary. Away from the boundary, this equation has a property known as integrability, making the scattering of the kinks particularly simple. However, if this integrability is broken at the boundary, then the scattering becomes surprisingly complicated, in ways that will be outlined in the talk with the help of some movies.

### 24.10.2017 (Tuesday)

#### Large Conformal Goldstone Mode Fluctuations in the SYK Model

Regular Seminar Alexander Altland (Koeln)

 at: 15:00 City U.room C310 abstract: This talk addresses the low energy physics of the Sachdev-Ye-Kitaev model, a paradigm of strongly interacting (Majorana) quantum matter. A salient feature of this system is its exceptionally high degree of symmetry under reparameterizations of physical time. At low energies this symmetry is spontaneously broken and the ensuing infinite dimensional Goldstone mode manifold takes strong influence on all physical observables. We will discuss the effects of these fluctuations on the example of the so-called out of time ordered correlation functions, diagnostic tools to describe both manifestations of quantum chaos in the system and its conjectured duality to an AdS2 gravitational bulk. While previous work predicts exponential decay of these correlations in time our main finding is that at large time scales non-perturbative Goldstone mode fluctuations generate a crossover to power law behavior. This phenomenon must have ramifications in the physics of the holographic bulk which, however, we do not understand at present.

### 17.10.2017 (Tuesday)

#### Renormalization of total sets of states into generalized bases with a resolution of the identity: a cooperative game theory approach

 at: 15:00 City U.room ELG11 abstract: A total set of states for which we have no resolution of the identity (a 'pre-basis'), is considered in a finite dimensional Hilbert space. A dressing formalism renormalizes them into density matrices which resolve the identity, and makes them a 'generalized basis', which is practically useful. The dresssing mechanism is inspired by Shapley's methodology in cooperative game theory, and it uses Moebius transforms. There is non-independence and redundancy in these generalized bases, which is quantified with a Shannon type of entropy. Due to this redundancy, calculations based on generalized bases, are sensitive to physical changes and robust in the presence of noise. For example, the representation of an arbitrary vector in such generalized bases, is robust when noise is inserted in the coefficients. Also in a physical system with ground state which changes abruptly at some value of the coupling constant, the proposed methodology detects such changes, even when noise is added to the parameters in the Hamiltonian of the system.

### 11.10.2017 (Wednesday)

#### Polygon Seminar

Triangular Seminar TBA TBA (TBA)

 at: 15:00 City U.room TBA abstract:

### 10.10.2017 (Tuesday)

#### Brane sigma models and solutions in M, Mstar, and Mprime theories

Regular Seminar Sarben Sarkar (King's)

 at: 15:00 City U.room ELG04 abstract: I discuss one and two-parameter solutions of sigma models on symmetric spaces contained in E11. Embedding one-parameter sigma model solutions in space-time give a metric which depends on harmonic functions typical in general relativity, supergravity and M-theory. Embedding two-parameter sigma model solutions in space-time give a metric which depends on general travelling wave functions in M* and M’-theory (theories which have space-time signatures with more than one time). Weyl reflection allows the latter solutions to be mapped to M-theory solutions where the wave functions depend explicitly on extra co-ordinates contained in the fundamental representation of E11. I will also give an example of two-time physics realisable in the laboratory

### 03.10.2017 (Tuesday)

#### Neuro-Topology: An interaction between topology and neuroscience

Regular Seminar Ran Levi (Aberdeen)

 at: 15:00 City U.room ELG08 abstract: While algebraic topology is now well established as an applicable branch of mathematics, its emergence in neuroscience is surprisingly recent. In this talk I will present a summary of an ongoing joint project with mathematician and neuroscientists. I will start with some basic facts on neuroscience and the digital reconstruction of a rat’s neocortex by the Blue Brain Project in EPFL. I will then explain how data emerging from this reconstruction can be mapped into abstract graphs that in turn give rise to certain mathematical objects in the realm of algebraic and combinatorial topology. Following a short introduction to some of the basic tools of algebraic topology, I will explain how they can potentially be used in the context of neuroscience. Having set up the scene, I will proceed by presenting the results of an ongoing collaboration with the Blue Brain Project team. In particular I shall demonstrate how the topological techniques give new insights on the behaviour of neural systems and inspire new directions in neuroscience research.

### 02.10.2017 (Monday)

Regular Seminar Christopher Couzens (King's)

 at: 11:00 City U.room E205 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.

### 03.05.2017 (Wednesday)

#### The 43rd Edwards Lecture: Carlo Rubbia (Nobel Laureate and Former Director General of CERN)

Colloquium Carlo Rubbia (CERN)

 at: 18:30 City U.room Oliver Thompson Lecture Theatre abstract: "The Role of Elementary Particle Accelerators" http://www.city.ac.uk/events/2017/may/edwards-lecture-the-role-of-elementary-particle-accelerators (Public lecture and Colloquium)

### 14.02.2017 (Tuesday)

#### M-theory Branes for City Folk

Regular Seminar Neil Lambert (King's)

 at: 15:00 City U.room B103 abstract: I will discuss some novel algebraic structures and how they lead to the quantum field theories that arise on the world volumes of 2-branes and 5-branes in M-theory.