loop quantum gravity
LPG is a promising theory. Nodes forms loops. Loops forms branes. Branes form the foam. Foams form the fermions and bosons as per my prediction. Matter cannot be formed directly from the space-time curvature. How from nothing you will use GR and get matter. Common sense suggest that mass and space are seperate entities. In LQG, the nodes are masses and the space between them is really the three dimensional space that we are observing in day to day life. This is a serious violation of GR. GR gets matter out of space and time. It is highly impossible. Compared to GR LQG is promising theory and the only thing is interpret its results. This is the right time to take a deviation from GR.