Gravitational Waves and the Cosmological Constant

Series: 
The London Relativity and Cosmology Seminar
Speaker: 
Peter Hogan (UCD)
Date: 
October 22nd, 2014 at 16:30
Room: 
See Talk Details
Abstract: 

The collision of two plane gravitational shock waves propagating in a vacuum generates a cosmological constant. When the plane gravitational waves are accompanied by plane electromagnetic shock waves then fine tuning of the amplitudes results in, arguably, the simplest post-collision space-time ever found. Finally a study of the histories of plane waves in space-times of constant curvature distinguishes de Sitter space-time from Anti de Sitter space-time in a natural way. - Room 516