Dark Energy, Lorentz Violation and Ghosts
Air Date: 05/20/2007
Air Time: 2:00 PM EST
Length: 1 Hours, 3 Minutes, 25 Seconds
I describe how vacuum energy can be controlled by a symmetry principle that necessitates a ghost sector. I argue that the implied instability of Minkowski spacetime is natural and consistent with experience if gravity is fundamentally Lorentz-violating, and describe attempts to construct such exotic dynamics. I briefly discuss the more robust experimental/observational signatures of such a scenario.