Probing dark energy with braneworld cosmology in the light of recent cosmological data

TL;DR

This paper tests a braneworld cosmology model with dark energy against recent observational data, finding no significant deviations from standard cosmology but setting new bounds on model parameters.

Contribution

It provides observational constraints on a Randall-Sundrum braneworld model with dark energy using multiple cosmological datasets.

Findings

EoS consistent with cosmological constant at 3σ

BAO data favors quintessence dark energy

No significant evidence for extra dimension effects within current uncertainties

Abstract

We investigate a brane model based on Randall-Sundrum scenarios with a generic dark energy component. The latter drives the accelerated expansion at late times of the Universe. In this scheme, extra terms are added into Einstein Field equations that are propagated to the Friedmann equations. To constrain the dark energy equation of state (EoS) and the brane tension we use observational data with different energy levels (Supernovae type Ia, $H(z)$, baryon acoustic oscillations, and cosmic microwave background radiation distance, and a joint analysis) in a background cosmology. Beside EoS being consistent with a cosmological constant at the $3\sigma$ confidence level for each dataset, the baryon acoustic oscillations probe favors an EoS consistent with a quintessence dark energy. Although we found different lower limit bounds on the brane tension for each data sets, being the most restricted for CMB, there is not enough evidence of modifications in the cosmological evolution of the Universe by the existence of an extra dimension within observational uncertainties. Nevertheless, these new bounds are complementary to those obtained by other probes like table-top experiments, Big Bang Nucleosynthesis, and stellar dynamics. Our results show that a further test of the braneworld model with appropriate correction terms or a profound analysis with perturbations, may be needed to improve the constraints provided by the current data.