Strong coupling in extended Horava-Lifshitz gravity

TL;DR

This paper investigates an extended Horava-Lifshitz gravity model, revealing that it still suffers from strong coupling issues, which questions its viability as an alternative to general relativity.

Contribution

The study demonstrates that the extended Horava-Lifshitz gravity model does not resolve the strong coupling problem present in earlier versions.

Findings

Strong coupling persists in the extended model

Doubts about the model's viability as an alternative to GR

Highlights need for further modifications or different approaches

Abstract

An extension of Horava-Lifshitz gravity was recently proposed in order to address the pathological behavior of the scalar mode all previous versions of the theory exhibit. We show that even in this new extension the strong coupling persists, casting doubts on whether such a model can constitute an interesting alternative to general relativity (GR).