tag: cosmology
3 proofs
Dark energy constitutes more than 68% of the universe's total energy density according to the Planck 2018 legacy release.
Sources: Planck Collaboration VI (2020), A&A 641, A6 — arXiv:1807.06209 (ar5iv HTML), UNLV Cosmic Parameters Reference (sourced from Planck 2018)
Local Cepheid-variable measurements of the Hubble constant exceed 72 km s⁻¹ Mpc⁻¹ while the 2018 Planck CMB inference yields a value below 68 km s⁻¹ Mpc⁻¹.
Sources: Riess et al. 2022 (arXiv:2112.04510), Riess et al. 2022 (ApJL 934 L7, IOPscience), Planck Collaboration 2018 (arXiv:1807.06209) +1 more
The theoretical vacuum energy density from quantum field theory exceeds the observed cosmological-constant value inferred from Type Ia supernovae by more than \(10^{120}\) orders of magnitude.
Sources: Wikipedia — Cosmological constant problem, Wikipedia — Dark energy, CosmoVerse COST Action — Quantum vacuum: the cosmological constant problem