Cosmological braneworld solutions with bulk scalar field in DGP setup
Kourosh Nozari, M. Khamesian, N. Rashidi
TL;DR
This paper investigates the cosmological effects of bulk scalar fields in the DGP braneworld model, demonstrating late-time acceleration and exploring phantom field scenarios through analytical and numerical methods.
Contribution
It introduces a superpotential approach to analyze bulk scalar fields in the DGP model, revealing new aspects of their cosmological dynamics and late-time acceleration.
Findings
Normal branch exhibits late-time de Sitter expansion
Phantom scalar fields are analyzed in the bulk
Numerical analysis explores parameter space
Abstract
We study cosmological dynamics of a canonical bulk scalar field in the DGP setup within a superpotential approach. We show that the normal branch of this DGP-inspired model realizes a late-time de Sitter expansion on the brane. We extend this study to the case that the bulk contains a phantom scalar field. Our detailed study in the supergravity-style analysis reveals some yet unexplored aspects of cosmological dynamics of bulk scalar field in the normal DGP setup. Some clarifying examples along with numerical analysis of the model parameter space are presented in each case.
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