Complementary cosmological tests of RSII brane models

TL;DR

This paper uses multiple cosmological observations, including supernovae, BAO, and CMB data, to place stringent limits on the brane tension parameter in RSII brane models, showing it is very small.

Contribution

It provides the first comprehensive observational bounds on the brane tension in RSII models using combined cosmological data sets.

Findings

Omega_{lambda} < 4.10^{-5} (1sigma)

Spatial curvature has negligible effect on Omega_{lambda} estimates

Joint data analysis effectively constrains brane tension parameter

Abstract

In this paper we explore observational bounds on flat and non-flat cosmological models in Type II Randall-Sundrum (RSII) branes. In a first analysis, we consider current measurements of the expansion rate H(z) (with two priors on the local Hubble parameter) and 288 Type Ia supernovae from the Sloan Digital Sky Survey (within the framework of the mlcs2k2 light-curve fitting method). We find that the joint analysis involving these data is an interesting tool to impose limits on the brane tension density parameter (Omega_{lambda}) and that the spatial curvature has a negligible influence on Omega_{lambda} estimates. In order to obtain stronger bounds for the contribution of the $\Omega_{\lambda}$ we also add in our analysis the baryon oscillation peak (BAO) and cosmic microwave background radiation (CMB) observations by using the so-called CMB/BAO ratio. From this analysis we find that the Omega_{lambda} contribution is less than 4.10^{-5} (1sigma).