Читать книгу Origin and Evolution of the Universe - Группа авторов - Страница 18

The data described in this chapter have converted cosmology from a speculative metaphysical exercise into a data-driven branch of astrophysics. Detailed calculations have been done using a standard cosmological model that has the following components: a primordial perturbation spectrum that is very close to equal power on all scales as predicted by inflation, a flat geometry or a total density equal to the critical density as predicted by inflation, and three main densities. These are ordinary matter (all the atoms in the Universe) with density 0.4189 ± 0.0026 10⁻²⁴ gram/ meter³, cold dark matter with density 2.232 ± 0.019 10⁻²⁴ gram/meter³, and dark energy dominating with density 3349 ± 67 eV/centimeter³. (When expressed in directly comparable units, the dark energy density is a bit more than twice that of the dark matter.) This model predicts a Hubble constant of 68 km/s/Mpc which is very slightly lower than the best direct measurement, and an age of the Universe of 13.8 Gyr.