where does the dark reaction get its energy from
Assuming that the standard model of cosmology is correct, the best current measurements indicate that dark energy contributes 68.3% of the total energy in the present-day observable universe. The mass -- energy of dark matter and ordinary (baryonic) matter contribute 26.8% and 4.9%, respectively, and other components such as neutrinos and photons contribute a very small amount. The density of dark energy (~ 7 × 10 g / cm) is very low, much less than the density of ordinary matter or dark matter within galaxies. However, it dominates the mass -- energy of the universe because it is uniform across space.