Geometry and topology in gravitational lensing theorySpeaker: Marcus Werner (Kavli IPMU, University of Tokyo, Japan; also Mathematics Department, Duke University, US)----Shanghai Astronomical Observatory,Chinese Academy of Sciences

About Us

	Brief Introduction
	History
	Directors
	Organization
	Research Groups
	Scientific Progress
	Seminars
	Colloquia
	CAS Members
	Experts
	Faculty

Research Fields

	Center for Astro-geodynamics
	Astrophysics Division
	DRAST (Division of Radio Astronomy Science and Technology )
	High Technology Laboratories

Location: Home>Research>Seminars

Geometry and topology in gravitational lensing theorySpeaker: Marcus Werner (Kavli IPMU, University of Tokyo, Japan; also Mathematics Department, Duke University, US)

Author：

ArticleSource：

Update time：

2013-12-18

Text Size: A A A

Title: Geometry and topology in gravitational lensing theorySpeaker: Marcus Werner (Kavli IPMU, University of Tokyo, Japan; also Mathematics Department, Duke University, US)

　　Time & Place: Wednesday, 10:00am, December 18th, Meeting Room 1714Abstract:

　　The standard theory for gravitational light deflection used in astronomy has a rich mathematical structure. I will review classic results from Morse theory on multiple images as well as a geometric interpretation of certain magnification invariants in terms of Lefschetz theory. Topological properties of the optical (or Fermat-) geometry will also be discussed, including the Gauss-Bonnet method for deflection angle computations and its recent extension to the Kerr-Randers optical geometry.