Generalised Ellis-Bronnikov wormholes embedded in warped braneworld background and energy conditions

TL;DR

This paper explores embedding generalized Ellis-Bronnikov wormholes in a five-dimensional warped background, demonstrating that the warp factor can satisfy energy conditions typically violated in four-dimensional models, thus reducing the need for exotic matter.

Contribution

It introduces a generalized wormhole model with a new shape function parameter and analyzes how embedding in a warped extra dimension improves energy condition satisfaction.

Findings

Warped background satisfies weak energy conditions for EB wormholes.

Energy conditions are improved compared to four-dimensional models.

Warped extra dimensions help avoid exotic matter in wormhole construction.

Abstract

Ellis-Bronnikov (EB) wormholes require violation of null energy conditions at the `throat'. This problem was cured by a simple modification of the `shape function', which introduces a new parameter $m\ge 2$ ($m=2$ corresponds to the EB model). This leads to a generalised (GEB) version. In this work, we consider a model where the GEB wormhole geometry is embedded in a five dimensional warped background. We studied the status of all the energy conditions in detail for both EB and GEB embedding. We present our results analytically (wherever possible) and graphically. Remarkably, the presence of decaying warp factor leads to satisfaction of weak energy conditions even for the EB geometry, while the status of all the other energy conditions are improved compared to the four dimensional scenario. Besides inventing a new way to avoid the presence of exotic matter, in order to form a wormhole passage, our work reveals yet another advantage of having a warped extra dimension.