Planck and low-redshift data constrain the Stern-Xu Regge-Teitelboim extra acceleration component to Ω_RT < 0.006 at 95% confidence, making the model observationally indistinguishable from ΛCDM.
\Lambda=0 Cosmology of a Brane-like Universe
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abstract
We examine the possibility that Friedman-Robertson-Walker evolution is governed by an effective (rather then by the actual) energy density. A concrete example is provided by $\Lambda=0$ Regge-Teitelboim cosmology, where critical cosmology only requires subcritical matter density $(\Omega_{m}<1)$, and the age of a flat matter dominated Universe gets enhanced by a factor of 9/8. Dual to the mature dilute Universe is the embryo Universe, the evolution of both is governed by $P_{eff}=-{1/9}\rho_{eff}$.
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Updated constraints on Regge-Teitelboim gravity
Planck and low-redshift data constrain the Stern-Xu Regge-Teitelboim extra acceleration component to Ω_RT < 0.006 at 95% confidence, making the model observationally indistinguishable from ΛCDM.