Lorentz violation in gravity

Abstract

The study of gravitational theories without Lorentz invariance plays an important role to understand different aspects of gravitation. In this short contribution we will describe the construction, main advantages and some phenomenological considerations associated with the presence of a preferred time direction.Comment: 4 pages. To appear in the proceedings of the 2015 Rencontres de Moriond, "Gravitation: 100 years after GR