Observational constraints on Chaplygin cosmology in a braneworld scenario with induced gravity and curvature effect

TL;DR

This paper investigates a braneworld cosmological model with Gauss-Bonnet curvature effects and Chaplygin gas, demonstrating its ability to mimic phantom behavior and fit observational data for late-time universe evolution.

Contribution

It introduces a novel extended induced gravity braneworld model incorporating Gauss-Bonnet and Chaplygin gas effects, analyzing its cosmological dynamics and observational constraints.

Findings

Model exhibits effective phantom behavior over a wide redshift range.

Enables smooth crossing of the phantom-divide line.

Fits observational data from SNe, CMB, and BAO.

Abstract

We study cosmological dynamics and late-time evolution of an extended induced gravity braneworld scenario. In this scenario, curvature effects are taken into account via the Gauss-Bonnet term in the bulk action and there is also a Chaplygin gas component on the brane. We show that this model mimics an effective phantom behavior in a relatively wider range of redshifts than previously formulated models. It also provides a natural framework for smooth crossing of the phantom-divide line due to presence of the Chaplygin gas component on the brane. We confront the model with observational data from type Ia Supernovae, Cosmic Microwave Background and Baryon Acoustic Oscillations to constraint the model parameters space.