Projectable Horava-Lifshitz gravity in a nutshell

TL;DR

This paper reviews various versions of Horava-Lifshitz gravity, focusing on the projectable model, and summarizes key findings on its viability within the context of a renormalizable, Lorentz-violating gravity theory.

Contribution

It clarifies the differences among Horava-Lifshitz gravity variants and provides a concise summary of the viability of the projectable model.

Findings

Overview of different Horava-Lifshitz gravity approaches

Clarification of their differences and similarities

Summary of the viability of the projectable model

Abstract

Approximately one year ago Horava proposed a power-counting renormalizable theory of gravity which abandons local Lorentz invariance. The proposal has been received with growing interest and resulted in various different versions of Horava-Lifshitz gravity theories, involving a colourful potpourri of new terminology. In this proceedings contribution we first motivate and briefly overview the various different approaches, clarifying their differences and similarities. We then focus on a model referred to as projectable Horava-Lifshitz gravity and summarize the key results regarding its viability.