Phantom Crossing DGP Gravity

TL;DR

This paper introduces a modified DGP gravity model that allows the effective equation of state to cross the phantom divide, aligning better with recent cosmological observations without requiring dark energy.

Contribution

The authors extend the original DGP model to enable phantom crossing, providing a more observationally compatible alternative to existing DGP models.

Findings

The new model achieves crossing of the phantom divide line.

It better fits observational data from SNIa, CMB, and BAO.

It accounts for late-time cosmic acceleration without dark energy.

Abstract

We propose a phantom crossing Dvali--Gabadadze--Porrati (DGP) model. In our model, the effective equation of state of the DGP gravity crosses the phantom divide line. We demonstrate crossing of the phantom divide does not occur within the framework of the original DGP model or the DGP model developed by Dvali and Turner. By extending their model, we construct a model that realizes crossing of the phantom divide. DGP models can account for late-time acceleration of the universe without dark energy. Phantom Crossing DGP model is more compatible with recent observational data from Type Ia Supernovae (SNIa), Cosmic Microwave Background (CMB) anisotropies, and Baryon Acoustic Oscillations (BAO) than the original DGP model or the DGP model developed by Dvali and Turner.