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.
Cosmic acceleration in Regge-Teitelboim gravity
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abstract
The Regge-Teitelboim formulation of gravity, which utilizes dynamical embeddings in a background space, effectively introduces source terms in the standard Einstein equations that are not attributable to the energy-momentum tensor. We show that for a simple class of embeddings of the Robertson-Walker metric, these source terms naturally generate cosmic acceleration.
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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.