## 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)

### 15.06.2022 (Wednesday)

#### TBA

Regular Seminar Ines Varela Aniceto (Southampton University)

 at: 13:45 KCLroom k0.20 abstract: TBA

### 20.04.2022 (Wednesday)

#### TBA

Regular Seminar Jose Figueroa-O'Farrill (University of Edinburgh)

 at: 13:45 KCLroom k0.20 abstract: TBA

### 06.04.2022 (Wednesday)

#### TBA

Regular Seminar Irene Valenzuela (Harvard University)

 at: 13:45 KCLroom k0.20 abstract: TBA

### 30.03.2022 (Wednesday)

#### TBA

Regular Seminar Eleni Kontou (University of Amsterdam)

 at: 13:45 KCLroom k0.20 abstract: TBA

### 23.03.2022 (Wednesday)

#### TBA

Regular Seminar Avner Karasik (Cambridge Univ. DAMTP)

 at: 13:45 KCLroom K0.20 abstract: TBA

### 16.03.2022 (Wednesday)

#### TBA

Regular Seminar Sean Hartnoll (Cambridge Univ. DAMTP)

 at: 13:45 KCLroom K0.20 abstract: TBA

### 09.03.2022 (Wednesday)

#### TBA

Regular Seminar Michele Del Zotto (Uppsala University)

 at: 13:45 KCLroom K0.20 abstract: TBA

### 23.02.2022 (Wednesday)

#### TBA

Regular Seminar Johan Henriksson (Pisa University)

 at: 13:45 KCLroom K0.20 abstract: TBA

### 16.02.2022 (Wednesday)

#### TBA

Regular Seminar Vasco Goncalves (University of Porto)

 at: 13:45 KCLroom K0.20 abstract: TBA

### 09.02.2022 (Wednesday)

#### TBA

Regular Seminar Justin Kaidi (Stony Brook U.)

 at: 14:45 KCLroom Online abstract: TBA

### 26.01.2022 (Wednesday)

#### TBA

Regular Seminar Mao Zeng (University of Edinburgh)

 at: 13:45 KCLroom K0.20 abstract: TBA

### 19.01.2022 (Wednesday)

#### Infrared phases of 2d QCD

Regular Seminar Diego Delmastro (Perimeter Institute)

 at: 13:45 KCLroom Online abstract: We will study some aspects of Quantum Chromodynamics (QCD) in d=1+1 spacetime dimensions. The theory presents many of the same challenges as d=3+1 dimensional QCD (e.g., strong interactions where perturbation theory breaks down, chiral quarks which are hard to put on the lattice, etc.). But, in 2d, there are also some special features that make the problem more tractable. We will see that one can effectively solve the system at strong coupling, revealing interesting connections to other well-studied theories such as 2d rational CFTs (minimal models, WZW models, etc.).

### 15.12.2021 (Wednesday)

Regular Seminar Alejandra Castro (UvA)

 at: 13:45 KCLroom Online abstract: In this talk I will describe holographic properties of near-AdS_2 spacetimes that arise within spherically symmetric configurations of N=2 4D supergravity, for both gauged and ungauged theories. These theories pose a rich space of AdS_2xS^2 backgrounds, and their responses in the near-AdS_2 region are not universal. I will show that the spectrum of operators dual to the matter fields, and their cubic interactions, are sensitive to properties of the background and the theory it is embedded in. The properties that have the most striking effect are whether the background is BPS or non-BPS, and if the theory is gauged or ungauged. The resulting differences will have an imprint on the quantum nature of the microstates of near-extremal black holes, reflecting that not all extremal black holes respond equally when kicked away from extremality.

### 08.12.2021 (Wednesday)

#### Holographic Duals of Argyres-Douglas Theories

Regular Seminar Emily Nardoni (Kavli IPMU)

 at: 13:45 KCLroom Online abstract: The strongly coupled Argyres-Douglas field theories have particular significance among four-dimensional N=2 SCFTs. In this talk, we describe new AdS5 solutions in 11d supergravity and identify them as the gravity duals of a large class of Argyres-Douglas theories, engineered via a stack of M5-branes wrapping a sphere. A notable feature of the gravity solutions is an internal M5-brane source, which is dual to an irregular puncture on the sphere. We explain how the holographic data (including central charges) match the data of the dual Argyres-Douglas field theories

### 24.11.2021 (Wednesday)

#### Conformal bootstrap meets cosmology

Regular Seminar Matthijs Hogervorst (EPFL)

 at: 13:45 KCLroom K0.20 abstract: Local observables in a de Sitter universe become conformal, if you wait long enough. Indeed, one can study the imprints of inflation by looking at conformal correlations in the sky. Thereâ€™s an ongoing effort in the cosmology community to understand these late-time correlators from first principles, without invoking a specific Lagrangian. In this talk, I will discuss the late-time CFT living in de Sitter through the lens of a quantum field theorist. The CFT in question shares many features with its counterparts in flat space or AdS, but differs in crucial aspects: in particular, it can have complex scaling dimensions and correlation functions. I will nevertheless argue that de Sitter CFTs have good unitarity properties and can be constrained via conformal bootstrap equations. This observation should open up a new way to constrain cosmological correlation functions.

### 22.11.2021 (Monday)

#### Quantum Black Holes and (Mock) Modularity -- An encounter between Ramanujan and Hawking

Colloquium Atish Dabholkar (ICTP)

 at: 14:30 KCLroom K6.29 abstract: Mathematical ideas introduced by Ramanujan a century ago in number theory and combinatorics have come to play a surprising role in understanding some deep and fundamental aspects of quantum gravity and quantum field theory in three very distinct contexts of holography, duality, and topology. In this colloquium, I shall first describe the fascinating history, physics, and mathematics behind this rich and fruitful connection focusing on the role (mock) modular forms have come to play in understanding quantum properties of black holes in string theory. I shall then elucidate briefly the manifestations of mock modularity in physics in its other avatars.

### 17.11.2021 (Wednesday)

#### Boundary criticality of the O(N) model in d = 3 critically revisited

Regular Seminar Maxim Metlitski (MIT)

 at: 17:00 KCLroom Online abstract: It is known that the classical O(N) model in dimension d > 3 at its bulk critical point admits three boundary universality classes: the ordinary, the extraordinary and the special. The extraordinary fixed point corresponds to the bulk transition occurring in the presence of an ordered boundary, while the special fixed point corresponds to a boundary phase transition between the ordinary and the extra-ordinary classes. While the ordinary fixed point survives in d = 3, it is less clear what happens to the extraordinary and special fixed points when d = 3 and N is greater or equal to 2. I'll show that formally treating N as a continuous parameter, there exists a finite range 2 < N < N_c where the extra-ordinary universality class survives, albeit in a modified form: the long-range boundary order is lost, instead, the order parameter correlation function decays as a power of log r. I'll discuss recent Monte-Carlo simulations and numerical bootstrap results that confirm the above picture and indicate that the critical value N_c > 3. Based on arXiv:2009.05119, 2111.03613, 2111.03071

### 10.11.2021 (Wednesday)

#### Phase transitions for deformations of JT supergravity and matrix models

Regular Seminar G Joaquin Turiaci (IAS)

 at: 13:45 KCLroom online abstract: We analyze black holes in deformations of Jackiw-Teitelboim (JT) supergravity by adding a gas of defects, equivalent to changing the dilaton potential. For some range of deformations, the black hole density of states extracted from the gravitational path integral becomes negative, yielding an ill-defined sum over topologies. To solve this problem, we use an equivalent matrix model description and show the negative spectrum is resolved via a phase transition analogous to the Gross-Witten transition. The matrix model contains a rich and novel phase structure that we explore in detail, using both perturbative and non-perturbative techniques.

### 08.11.2021 (Monday)

#### Berry Phases and Complexity as Probes of Bulk Geometry

Exceptional Seminar Claire Zukowski (University of Amsterdam)

 at: 15:45 KCLroom Norfolk Building G.01 abstract: I will describe two new quantum information theoretic probes of bulk geometry that access information inaccessible to spacelike geodesics. The first arises from considering a parallel transport process of modular Hamiltonians on the boundary under a change of state. I will show that the Berry curvature for this process computes the entanglement wedge symplectic form associated to a family of Euclidean cosmic brane solutions. Next, I will derive the circuit complexity for conformal field theory in arbitrary dimensions. I will show that circuits are dual to timelike geodesics in the bulk, and that the complexity metric admits a simple bulk geometric description in terms of distances between geodesics. In either case, these quantities are governed by the geometry of coadjoint orbits, which are special symplectic manifolds arising from group theory. The state-changing modular Berry transport process naturally describes the geometry of new, Virasoro-like coadjoint orbits that extend beyond the current classification. The complexity metric describes the geometry of a particular coadjoint orbit of the conformal group in arbitrary dimensions.

### 03.11.2021 (Wednesday)

#### AdS Bulk Locality from Sharp CFT Bounds

Regular Seminar Dalimil Mazac (IAS)

 at: 13:45 KCLroom Online abstract: It has been a long-standing conjecture that any CFT with a large central charge and a large gap M in the spectrum of single-trace operators must be dual to a local effective field theory in AdS. In my talk, I will discuss a proof of a sharp form of this conjecture. In particular, I will explain how to derive numerical bounds on bulk Wilson coefficients in terms of M using the conformal bootstrap. The bounds exhibit scaling in M expected from dimensional analysis in the bulk. The main technical tools are dispersive CFT sum rules. These sum rules provide a dictionary between CFT dispersion relations and S-matrix dispersion relations in appropriate limits. This dictionary allows one to apply recently-developed flat-space methods to construct positive CFT functionals. My talk will be based on https://arxiv.org/pdf/2106.10274.pdf, which is joint work with S. Caron-Huot, L. Rastelli, and D. Simmons-Duffin.