## Directions

Imperial College has its own detailed information on general directions and on getting to the theoretical physics group. The College is located on Prince Consort Road, south of Hyde Park (map). The most convenient access is via tube (South Kensington, Gloucester Road) or buses. The Theoretical Physics group resides on the 5th floor of the Huxley Building. The group also possesses its own description.

## Seminars at Imperial College

Found at least 20 result(s)

### 26.06.2019 (Wednesday)

#### TBA

Regular Seminar Henry Maxfield (UCSB)

 at: 14:00 ICroom H503 abstract:

### 12.06.2019 (Wednesday)

#### TBA

Regular Seminar Panos Betzios (Crete)

 at: 14:00 ICroom H503 abstract: TBA

### 05.06.2019 (Wednesday)

#### TBA

Regular Seminar Francesco Benini (SISSA)

 at: 14:00 ICroom H503 abstract:

### 29.05.2019 (Wednesday)

#### TBA

Regular Seminar Chris Blair (VUB)

 at: 14:00 ICroom H503 abstract: TBA

### 22.05.2019 (Wednesday)

#### Little Strings, Long Strings, and Fuzzballs

Regular Seminar Emil Martinec (Chicago)

 at: 14:00 ICroom H503 abstract: The microstate structure of AdS3 black holes involves stringy ingredients, yet quantitative control over these ingredients in a regime where the state being described approximates a black hole has been elusive. This talk will show how 2d worldsheet current algebra provides a tool to describe the stringy objects that govern the black hole phase transition in AdS3 and linear dilaton backgrounds, providing a bridge between the entropy-carrying degrees of freedom of the dual non-gravitational theory (little strings or long strings) and their conjectured gravitational dual, the fuzzball.

### 15.05.2019 (Wednesday)

#### TBA

Regular Seminar Vasileios Niarchos (Durham)

 at: 14:00 ICroom H503 abstract:

### 08.05.2019 (Wednesday)

#### Duality invariant cosmology to all orders in alpha prime

Regular Seminar Olaf Hohm (Humboldt, Berlin)

 at: 14:00 ICroom H503 abstract: I discuss the higher-derivative \alpha' corrections in the reduction to one dimension (cosmic time) that is relevant for the dynamics of cosmological backgrounds. In this setting string theory is known to be duality invariant under O(d,d), which makes it possible to completely classify all \alpha' corrections. I discuss some generic features of the \alpha' completed Friedmann equations and show that there are duality invariant theories that allow for de Sitter solutions that are non-perturbative in \alpha', suggesting that string theory may permit de Sitter vacua in this novel fashion.

### 01.05.2019 (Wednesday)

#### TBA

Regular Seminar Wout Merbis (ULB)

 at: 14:00 ICroom H503 abstract:

### 10.04.2019 (Wednesday)

#### Looking for Partially-Massless Gravity

Regular Seminar Karapet Mkrtchyan (Potsdam)

 at: 14:00 ICroom H503 abstract: We study the possibility for a unitary theory of partially-massless (PM) spin-two field interacting with Gravity in arbitrary dimensions. We show that parity invariant interactions respecting general covariance lead to a reconstruction of Conformal Gravity in even dimensions. In this case the unitarity is sacrificed. By relaxing the parity invariance, we find a possibility of a unitary theory in four dimensions, but the parity-odd cubic vertex cannot be written in usual metric variables. We comment on possible approaches that may allow for the formulation of this theory. Finally, by relaxing the general covariance, we show that a non-minimal coupling between massless and PM spin-two fields may lead to an alternative possibility of a unitary theory, that necessarily involves mixed-symmetry fields.

### 02.04.2019 (Tuesday)

#### TBA

Regular Seminar Andreas Albrecht (UC Davis)

 at: 13:30 ICroom H503 abstract:

### 27.03.2019 (Wednesday)

#### Infrared enhancement of supersymmetry in four dimensions

Regular Seminar Simone Giacomelli (Oxford)

 at: 14:00 ICroom H503 abstract: In this seminar I will discuss a recently-found class of RG flows in four dimensions exhibiting enhancement of supersymmetry in the infrared, which provides a lagrangian description of several strongly-coupled N=2 SCFTs. The procedure involves starting from a N=2 SCFT, coupling a chiral multiplet in the adjoint representation of the global symmetry to the moment map of the SCFT and turning on a nilpotent expectation value for this chiral. We show that, combining considerations based on 't Hooft anomaly matching and basic results about the N=2 superconformal algebra, it is possible to understand in detail the mechanism underlying this phenomenon and formulate a simple criterion for supersymmetry enhancement.

### 26.03.2019 (Tuesday)

#### TBA

Regular Seminar Sergej Moroz (TU Munich)

 at: 13:30 ICroom H503 abstract:

### 19.03.2019 (Tuesday)

#### TBA

Regular Seminar Andres Collinucci (ULB)

 at: 13:30 ICroom H503 abstract:

### 15.03.2019 (Friday)

#### Integrability, Poisson-Lie Symmetry and Double Field Theory

Regular Seminar Hassler Falk (University of Oviedo)

 at: 14:00 ICroom SAF 119 abstract: I review how integrability allows us to explore the planar limit of the AdS/CFT correspondence for arbitrary values of the t'Hooft coupling. In string theory integrability of the 2D σ-model is closely related to Poisson-Lie Symmetry. Double Field Theory can be used to make this symmetry manifest and therewith provides a new tool to study the implications for the gravity side of the correspondence.

### 13.03.2019 (Wednesday)

#### Holographic Complexity in Vaidya Spacetimes

Regular Seminar Shira Chapman (University of Amsterdam)

 at: 14:00 ICroom H503 abstract: We investigate holographic complexity for eternal black hole backgrounds perturbed by shock waves, with both the complexity=action (CA) and complexity=volume (CV) proposals. We consider Vaidya geometries describing a thin shell of null fluid with arbitrary energy falling in from one of the boundaries of a two-sided AdS-Schwarzschild spacetime. We demonstrate how scrambling and chaos are imprinted in the complexity of formation and in the full time evolution of complexity via the switchback effect for light shocks, as well as analogous properties for heavy ones.

### 12.03.2019 (Tuesday)

#### TBA

Regular Seminar Costas Bachas (ENS Paris)

 at: 13:30 ICroom H503 abstract:

### 06.03.2019 (Wednesday)

#### Soft Heisenberg Hair

Triangular Seminar Daniel Grumiller (TU Wien)

 at: 16:30 ICroom Blackett LT2 abstract: Gravity theories naturally allow for edge states generated by non-trivial boundary-condition preserving diffeomorphisms. I present a specific set of boundary conditions inspired by near horizon physics, show that it leads to soft hair excitations of black hole solutions and discuss implications for black hole entropy.

### 06.03.2019 (Wednesday)

#### Schwinger-Keldysh effective field theories

Triangular Seminar Natalia Pinzani Fokeeva (KU Leuven)

 at: 15:00 ICroom Blackett LT2 abstract: I will discuss novel effective field theories for hydrodynamics. After identifying the relevant low-energy degrees of freedom, I will show how the symmetries of the problem can be efficiently implemented using supersymmetry. Interestingly, a conserved entropy current naturally arises as a Noether current in superspace. If time permits, I will also show how to derive such effective actions from holography.

### 06.03.2019 (Wednesday)

#### tba

Triangular Seminar Natalia Pinzani Fokeeva (KU Leuven)

 at: 15:00 ICroom tba abstract:

### 05.03.2019 (Tuesday)

#### Rationalizing CFTs

Regular Seminar Matthew Buican (QMUL)

 at: 13:30 ICroom H503 abstract: 2D rational conformal field theories (RCFTs) are typically thought of as being the “nicest” interesting CFTs we can study: They have large enough symmetry so that there are only a finite number of primary fields, but they also have applications to the real world (e.g., to various condensed matter systems). In this talk, I will describe a program that aims to understand connections between exotic 4D theories with N=2 superconformal symmetry and more down-to-earth 2D RCFTs, thereby enriching our understanding of both.