Unitarity and Different Phases of the Extended New Massive Gravity
High Energy Physics - Theory
2020-06-16 v2 General Relativity and Quantum Cosmology
Abstract
We study the New Massive Gravity extended by the curvature cubed invariant and the Cosmological Constant using the tree-level scattering amplitudes on a maximally symmetric space-time. We identify the parameter space, consisting of the ratio between C.C. and graviton mass squared and the relative coupling strength between curvature squared and cubed invariants, for which the massive spin-2 is a ghost. Different phases of this model are also discussed.
Keywords
Cite
@article{arxiv.1912.09101,
title = {Unitarity and Different Phases of the Extended New Massive Gravity},
author = {Giorgi Tukhashvili},
journal= {arXiv preprint arXiv:1912.09101},
year = {2020}
}
Comments
1+10 pages, 3 figures; v2: comments added; published in PRD