Probing Lambda-DGP Braneworld Model

TL;DR

This paper investigates the cosmic evolution in the normal branch of the Lambda-DGP braneworld model, fitting it to Planck data and analyzing its implications for the universe's acceleration and coincidence problem.

Contribution

It provides the first detailed fit of the non-flat Lambda-DGP model using Planck data and explores its effects on cosmic acceleration and the coincidence problem.

Findings

Universe begins accelerated expansion earlier than in Lambda-CDM

Model alleviates the coincidence problem

Fits well with current Planck data

Abstract

In this article we study cosmic dynamics in the context of normal branch of DGP braneworld model. Using the current Planck data, we best fit the model and cosmological parameters in non-flat $\Lambda$DGP. With the transition redshift as a basic variable and statefinder parameters, our result shows that the Universe starts its accelerated expansion phase, slightly earlier than expected in $\Lambda$CDM cosmology. The result also alleviates the coincidence problem of the $\Lambda$CDM model.