Main Question or Discussion Point
Vacuum or dark energy have energy densities. (Markus, a science advisor at Physics Forums in 2003, estimated that dark energy has an energy density of about 0.5 Joule per cubic km.) I assume that the structure of space-time has an energy density, that it was measured and that it can be calculated. How is it calculated? (I am not referring to the kinetic and potential energy of an asteroid moving in space-time.) The geometry of space-time functions like a field, but is not a field as the electro-magnetic field is. Is space-time energy density higher near a star than in deep space? (I am not referring to the strength of the gravitational force at these locations.) Is dark energy just an average of space-time energy? Space-time is a proven mathematical model for our universe, but there must be a physical reality an the quantum level.