Braneworlds with timelike extra-dimension

TL;DR

This paper explores a braneworld model with a timelike extra-dimension, constraining its parameters through cosmological data, and finds it behaves similarly to the standard LambdaCDM model under observational tests.

Contribution

It introduces a braneworld model with a timelike extra-dimension and assesses its viability using observational data, establishing conditions for physical solutions.

Findings

Model parameters constrained by cosmological data

Model indistinguishable from LambdaCDM in tests

Consistency with observations for certain parameter ranges

Abstract

In this work, we consider a braneworld model with a timelike extra-dimension. There are strong constraints to the parameter values of such a model resulting from the claim that there must be a physical solution to the Friedmann equation at least between now and the time of recombination. We fitted the model to supernova type Ia data and checked the consistency of the result with other observations. For parameter values that are consistent with observations, the braneworld model is indistinguishable from a LambdaCDM universe as far as the considered cosmological tests are concerned.