Counting ghosts in the "ghost-free" non-local gravity
read the original abstract
In the recently proposed non-local theory of quantum gravity one can avoid massive tensor ghosts at the tree level by a special choice of the non-local form factor between the two Ricci tensors. We show that at the quantum level this theory has an infinite amount of massive unphysical states, mostly corresponding to complex poles.
This paper has not been read by Pith yet.
Forward citations
Cited by 2 Pith papers
-
The Spectrum of Quantum Gravity
Higher-order curvature operators like R□R add new poles and shift existing ones in the graviton propagator, with a method to correctly derive the Einstein frame action illustrated for f(R) gravity.
-
Conditions for positivity of energy in superrenormalizable polynomial gravity
Derives conditions under which energy remains positive for individual plane waves in six- and eight-derivative polynomial gravity, focusing on tensor and scalar sectors of the free theory.
discussion (0)
Sign in with ORCID, Apple, or X to comment. Anyone can read and Pith papers without signing in.