Model-independent Evidence for Dark Energy Evolution from Baryon Acoustic Oscillations
Authors: V. Sahni, A. Shafieloo, and A. A. Starobinsky
Sahni, Shafieloo, & Starobinsky
2014 The Astrophysical Journal Letters793L40.
Provider: AAS Journals
Caption: Figure 1.
Hubble parameter (left panel) and the effective equation of state of dark energy (right panel) are shown for the Braneworld model described by Equation (12) (solid red) and ΛCDM (dotted green). Also shown is the matter contribution: , where H0 = 70 km s−1 Mpc−1 and Ω0m = 0.28 (dotted blue). In the Braneworld model, the cosmological constant is screened in the past as a result of which the expansion rate drops below that in ΛCDM at high z. This feature permits the Braneworld to better account for the low value of H(z = 2.34) discovered in Delubac et al. (2014). Note that at z 2.4. The associated pole in w(z) at z 2.4 is shown in the right panel. The parameters for the Braneworld model are Ω0m = 0.28 and Ωℓ = 0.025 in Equation (12).