Bulk scalar field in DGP braneworld cosmology
Rizwan ul Haq Ansari, P. K. Suresh
TL;DR
This paper explores how a bulk scalar field influences DGP braneworld cosmology, showing it can recover standard cosmology and explain late-time acceleration of the universe.
Contribution
It derives the effective Einstein equations with a bulk scalar field in the DGP model and demonstrates the scalar field's role in late-time cosmic acceleration.
Findings
Effective Einstein equations incorporating bulk scalar field.
Rescaled scalar field behaves as a 4D effective field.
Late-time acceleration of the universe explained by the model.
Abstract
We investigated the effects of bulk scalar field in the braneworld cosmological scenario. The Friedmann equations and acceleration condition in presence of the bulk scalar field for a zero tension brane and cosmological constant are studied. In DGP model the effective Einstein equation on the brane is obtained with bulk scalar field. The rescaled bulk scalar field on the brane in the DGP model behaves as an effective four dimensional field, thus standard type cosmology is recovered. In present study of the DGP model, the late-time accelerating phase of the universe can be explained .
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