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Dark Energy, Lorentz Violation and Ghosts



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Recording Details

Speaker(s): 
Scientific Areas: 
PIRSA Number: 
07050042

Abstract

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.