Note that pure Einsteinian General Relativity does not conserve energy -- even without a cosmological constant. Sometimes people fake it using tortuous analogi

Note that pure Einsteinian General Relativity does not conserve energy -- even without a cosmological constant. Sometimes people fake it using tortuous analogies that only hold if their spacetimes are nearly flat, but it fails to hold in the presence of curvature. The first link on Google for the relevant keywords is http://www.phys.ncku.edu.tw/mirrors/physicsfaq/Relativity/GR/energy_gr.html http://www.phys.ncku.edu.tw/mirrors/physicsfaq/Relativity/GR..., which lays it out nicely.