Found 10 result(s)
Regular Seminar Donal O'Connell (Edinburgh U.)
at: 14:00 room zoom  abstract: [there will be a 30min preseminar 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 NewmanJanis shift relating Kerr to Schwarzschild. I will describe the connection between amplitudes and classical physics, focussing on the case of Kerr. 
Colloquium Sir Simon Donaldson (Imperial College)
at: 16:00 room 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. 
String Theory & Geometry Seminar Simon Donaldson (Imperial College)
at: 13:00 room 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 CalabiYau 3folds 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. 
Regular Seminar Simon Donaldson (Imperial College)
at: 15:00 room IMS lecture theatre  abstract: For details, please consult the webpage www.ma.ic.ac.uk (slash) (tilde) rpwt (slash) LMS.html 
String Theory & Geometry Seminar Simon Donaldson (Imperial College)
at: 13:30 room Ballroom, 58 Princes Gate  abstract:

Topology & Geometry Seminar Simon Donaldson (IC)
at: 13:30 room H140  abstract:

String Theory & Geometry Seminar Simon Donaldson (IC)
at: 13:00 room 503 Huxley  abstract:

Exceptional Seminar Simon Donaldson (IC)
at: 18:00 room Clore Lecture Theatre, Huxley Building  abstract: INSTITUTE FOR MATHEMATICAL SCIENCES LAUNCH WEEK 
String Theory & Geometry Seminar Simon Donaldson (Imperial)
at: 13:30 room 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 4manifold. 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. 