Found 10 result(s)

### 25.03.2021 (Thursday)

#### Another dimension of Kerr

Regular Seminar Donal O'Connell (Edinburgh U.)

 at: 14:00 QMWroom zoom abstract: [there will be a 30min pre-seminar for students. For zoom link, please contact s.nagyATqmul.ac.uk] Abstract: Recent work has broadened the scope of scattering amplitudes to include large, classical objects such as the Kerr black hole. This new perspective illuminates surprising aspects of classical gravity, such as the Newman-Janis shift relating Kerr to Schwarzschild. I will describe the connection between amplitudes and classical physics, focussing on the case of Kerr.

### 14.03.2013 (Thursday)

#### TBA

Regular Seminar Donal O'Connell ()

 at: 14:00 QMWroom 208 abstract:

### 21.03.2012 (Wednesday)

#### Aspects of modern geometry: up-dating Hilbert

Colloquium Sir Simon Donaldson (Imperial College)

 at: 16:00 ICroom Blackett, Lecture Theatre 1 abstract: In the first part of the talk I will discuss the meaning of "geometry" in contemporary mathematics and some general developments. In the second part I will focus on a few particular problems which I know more about, such as questions involving topology and geometric structures on manifolds. The talk will in part be built around an imaginary conversation with Hilbert.

### 08.06.2009 (Monday)

#### Gauge theory on G2 manifolds and bundles over Calabi-Yau moduli spaces

String Theory & Geometry Seminar Simon Donaldson (Imperial College)

 at: 13:00 ICroom IMS seminar room abstract: In the first part of the talk I will review differential geometric background involving associative submanifolds of 7 manifolds with G2 holonomy and an analogue of the Yang Mills instanton equation for connections on bundles over such a manifold. Then I will describe joint work with Ed Segal in which, assuming these objects have suitable formal properties, we define holomorphic bundles over moduli spaces of Calabi-Yau 3-folds which can be viewed as the complexification of Floer theory. In the last part of the talk I will consider in more detail the problem of establishing the foundations required for the theory. This involves pertubations of the equations and the question of how to count solutions at infinity, which are pairs consisting of a connection and an associative submanifold. The counting problem leads to a nonlinear generalisation of the spectral flow for eigenvalues of Dirac operators.

### 08.04.2008 (Tuesday)

#### Kahler-Einstein and Ricci solitons on toric Fano manifolds

Regular Seminar Simon Donaldson (Imperial College)

 at: 15:00 ICroom IMS lecture theatre abstract: For details, please consult the webpage www.ma.ic.ac.uk (slash) (tilde) rpwt (slash) LMS.html

### 14.11.2005 (Monday)

#### Numerical Calabi-Yau metrics and projective geometry

String Theory & Geometry Seminar Simon Donaldson (Imperial College)

 at: 13:30 ICroom Ballroom, 58 Princes Gate abstract:

### 17.06.2005 (Friday)

#### Self-dual metrics with Killing fields and complex geometry

Topology & Geometry Seminar Simon Donaldson (IC)

 at: 13:30 ICroom H140 abstract:

### 06.06.2005 (Monday)

#### Field theories and numerical invariants in geometry and topology

String Theory & Geometry Seminar Simon Donaldson (IC)

 at: 13:00 ICroom 503 Huxley abstract:

### 25.04.2005 (Monday)

#### Curvature in Geometry and Physics

Exceptional Seminar Simon Donaldson (IC)

 at: 18:00 ICroom Clore Lecture Theatre, Huxley Building abstract: INSTITUTE FOR MATHEMATICAL SCIENCES LAUNCH WEEK

### 11.06.2004 (Friday)

#### The Chen-Lebrun-Weber metric and numerical solutions for toric surfaces

String Theory & Geometry Seminar Simon Donaldson (Imperial)

 at: 13:30 ICroom Maths institute seminar room abstract: The talk will have two themes. The first is to give an account of recent work of Chen, LeBrun and Weber, proving the existence of a new Einstein metric on a certain 4-manifold. The second will describe a general class of numerical solutions to Calabi's extremal metric equation. The two themes are related by the fact that the metric of Chen, LeBrun and Weber is conformal to an extremal metric, so explicit geometric information can be obtained.