Phantom-Like Behavior of a DGP-Inspired Scalar-Gauss-Bonnet Gravity

TL;DR

This paper explores a modified DGP-inspired braneworld model with Gauss-Bonnet curvature corrections, demonstrating self-acceleration and phantom-like behavior without dark energy or phantom fields.

Contribution

It introduces a novel combination of DGP-inspired gravity with Gauss-Bonnet terms, showing self-acceleration and phantom-like effects without dark energy.

Findings

The model's normal branch self-accelerates without dark energy.

Phantom-like behavior achieved without phantom fields.

Cosmological implications support viability of the modified scenario.

Abstract

We study the phantom-like behavior of a DGP-inspired braneworld scenario where curvature correction on the brane is taken into account. We include a possible modification of the induced gravity on the brane by incorporating higher order curvature terms of Gauss-Bonnet type. We investigate the cosmological implications of the model and we show that the normal branch of the scenario self-accelerates in this modified scenario without introducing any dark energy component. Also, a phantom-like behavior can be realized in this model without introducing any phantom field that suffers from serious difficulties such as violation of the null energy condition.