A Chiral Perturbation Expansion for Gravity
arXiv:hep-th/0511189 · doi:10.1088/1126-6708/2006/02/057
Abstract
A formulation of Einstein gravity, analogous to that for gauge theory arising from the Chalmers-Siegel action, leads to a perturbation theory about an asymmetric weak coupling limit that treats positive and negative helicities differently. We find power counting rules for amplitudes that suggest the theory could find a natural interpretation in terms of a twistor-string theory for gravity with amplitudes supported on holomorphic curves in twistor space.
11 pages, LaTeX, no figures; v2: one reference added