Superrenormalizable quantum gravity with complex ghosts
arXiv:1512.07600 · doi:10.1016/j.physletb.2016.02.021
Abstract
We suggest and briefly review a new sort of superrenormalizable models of higher derivative quantum gravity. The higher derivative terms in the action can be introduced in such a way that all the unphysical massive states have complex poles. According to the literature on Lee-Wick quantization, in this case the theory can be formulated as unitary, since all massive ghosts-like degrees of freedom are unstable.
LaTeX, 15 pages, no figures. Modified version with small misprints corrected and Acknowledgments section inserted. To be published in Physics Letters B