Perhaps, dark energy is repulsive field {quintessence, field}|, not virtual particles or vacuum energy. Quintessence is higher at higher potential energy and zero at lowest potential energy, so quintessence (and cosmological constant) decrease over time as universe expands. Perhaps, space negative pressure or quantum effects cause quintessence.
Quintessence field strength is almost zero. If strength was more, space expansion is so great that only radiation can exist. If strength was less, space expansion is so small that only matter can exist.
Physical Sciences>Astronomy>Universe>Cosmology>Energy
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Date Modified: 2022.0224