**SMS scnews item created by Boris Lishak at Tue 5 Mar 2019 1527**

Type: Seminar

Distribution: World

**Calendar1: 11 Mar 2019 1400-1500**

**CalLoc1: Carslaw 535A**

CalTitle1: Schlue -- Geometry of expanding black hole cosmologies

Auth: borisl@dora.maths.usyd.edu.au

### Geometry and Topology Seminar

# Geometry of expanding black hole cosmologies

### Volker Schlue (Melbourne)

Please join us for lunch before the talk. We are meeting at 12:30 on Carslaw level 2.
**Abstract:**

In general relativity, the so called Schwarzschild de Sitter spacetimes are the simplest models of a black hole in an expanding universe. I will describe the geometry of these 3+1-dimensional Lorentzian manifolds, and describe progress on a related stability problem for the Einstein vacuum equations. It turns out that the conformal Weyl curvature plays a central role in understanding the evolution of expanding spacetimes, and I will discuss a phenomenon known as the global redshift effect.