We can define another layering : which is another foliation Valid foliations always have every arrow pointing down Can in practice just make slices at any angle [[[ just rewrite the vertex coordinates ]]]
This is rotated too much....
Can we lay out the causal graph so every edge is at 45° ?
Spacetime volume = ( 1 - 1/6 R t t ) X flat space volume
At every point, average over ti, tj : get scalar curvature
Every edge in the causal growth as an elementary interval; spacetime volume element for an elementary light cone is 1
de Sitter space or something as a model non-flat spacetime.... https://www.frontiersin.org/articles/10.3389/fphy.2019.00032/full
[[[ Higher order terms would disappear because they are higher order in the ti, which are small ]]]
Put a marker on the graph, and assume that it propagates through edges of the causal graph.
There is a continuity equation for this marker ... assume at a bifurcation that the markers splits in each direction