Localising gravity in composite monopole brane worlds without bulk cosmological constant

TL;DR

This paper explores a 7D brane world with a composite monopole defect, demonstrating that strong interactions can localize gravity without needing a bulk cosmological constant.

Contribution

It introduces a model where a composite monopole defect enables gravity localization in higher dimensions without a bulk cosmological constant.

Findings

Global monopole disappears at large interaction, leaving a negative cosmological constant.

Gravity localization achieved without bulk cosmological constant.

Analysis of space-time structure in different interaction regimes.

Abstract

We study a 7-dimensional brane world scenario with a Ricci-flat 3-brane residing in the core of a composite monopole defect, i.e. a defect composed of a 'tHooft-Polyakov and a global monopole. Admitting a direct interaction between the two bosonic sectors of the theory, we analyse the structure of the space-time in the limits of small, respectively large direct interaction coupling constant. For large direct interaction, the global monopole disappears from the system and leaves behind a negative cosmological constant in the bulk such that gravity-localising solutions are possible without the a priori introduction of a bulk cosmological constant.