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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 Letters 793 L40.

  • 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 sime 2.4. The associated pole in w(z) at z sime 2.4 is shown in the right panel. The parameters for the Braneworld model are Ω0m = 0.28 and Ω = 0.025 in Equation (12).

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