Quantum METRO-dynamics--reuter's no-frill QG In straight classic GR, the geometry is described by the distance-function called the METRIC. the metric interacts with matter, and is a dynamical result, a solution, rather than being given the metric is the variable (degrees of freedom) describing the geometry and the geometry IS gravity. that is how Einstein set it up. So if you want to quantize gravity the direct straightforward way is to quantize the metric. Not any particle like a "graviton" living on flat space or any force or anything else---the direct no-frill approach following vintage Einstein is to quantize the metric. sometimes having an appropriate name for something helps to understand it and you could call classic Einstein GR by the name "metro-dynamics" because it is about the metric interacting with matter. and you could call Reuter direct no-frill quantization of metrodynamics by the name "quantum metro-dynamics" or QMD and that would be analogous terminology to QED and QCD (quantum electrodynamics and quantum chromodynamics) ===================== Reuter calls it "asymptotically safe quantum Einstein gravity" but I want to sometimes call it QMD because it is remarkably analogous to QED and QCD. The name makes me focus on the right things and helps me understand.